Academic article

• Yasmina Maria Tudorache; Simon Storgaard Jensen; Katie Jane Sheehan et al. (2026). Development and Internal Validation of a Machine Learning Model for Predicting Long-Term Opioid Therapy After Hip Fracture Surgery in Older, Opioid-Naïve Adults. (external link)
• Simon Storgaard Jensen; Per Hviid Gundtoft; Jan-Erik Gjertsen et al. (2026). Postoperative mobility is associated with risk of reoperation and increased mortality after hip fracture: a nationwide cohort study of 33,486 patients. (external link)
• Niamh A Merriman; Rose S Penfold; Mary E Walsh et al. (2025). Delirium and cognitive assessment in national hip fracture registries: a scoping review - PubMed. (external link)
• Cecilia Rogmark; Bjarke Viberg; Olof Wolf et al. (2025). Femoral neck fractures in adults with emphasis on surgical treatment. (external link)
• Simon Storgaard Jensen; Per Hviid Gundtoft; Jan-Erik Gjertsen et al. (2025). Impact of Dementia, Depression, and Other Mental Disorders on Reoperation and Mortality Among Hip Fracture Patients: A Nationwide Danish Cohort Study. (external link)
• Peter Sverre Frønsdal; Eva Hansen Dybvik; Torbjørn Kristensen et al. (2025). Comparison of Short and Long Intramedullary Nails in the Treatment of Trochanteric and Subtrochanteric Fractures : An Observational Study of 17,606 Fractures in the Norwegian Hip Fracture Register. (external link)
• Andrea Toft Boutera; Eva Hansen Dybvik; Geir Hallan et al. (2025). Weekend discharge after hip fracture surgery is associated with increased 30-day mortality. A retrospective observational study of 35,138 hip fractures reported to the Norwegian Hip Fracture Register. (external link)
• Raymond Andre Tellefsen; Torbjørn Kristensen; Eva Hansen Dybvik et al. (2025). Surgical approaches in hemiarthroplasty for hip fracture : results of 48,222 hemiarthroplasties in the Norwegian Hip Fracture Register. (external link)
• Tesfaye Hordofa Leta; Richard N. Chang; Stein Atle Lie et al. (2025). Antibiotic-Loaded Bone Cement and Risk of Infection After Knee Arthroplasty in High-Risk Patients. (external link)
• Simon Storgaard Jensen; Per Hviid Gundtoft; Jan-Erik Gjertsen et al. (2025). Individual and combined effects of somatic and mental disorders on reoperation risk after hip fracture surgery: a nationwide danish cohort study of 110,625 patients. (external link)
• Sjur Børsheim; Torbjørn Kristensen; Geir Hallan et al. (2025). Periprosthetic femoral fracture following hip arthroplasty : which component design and fixation method has the lowest risk of reoperation?. (external link)
• Nickolaj Risbo; Vera Ehrenstein; Per Hviid Gundtoft et al. (2025). Socioeconomic Position and Chronic Opioid Use After Hip Fracture Surgery: A Danish Population-Based Cohort Study. (external link)
• Sepideh Semsarian; Tone Kristin Omsland; Espen Kolstad Heen et al. (2024). Subsequent fracture risk in Norwegians and immigrants with an index forearm fracture: a cohort study. (external link)
• Tesfaye Hordofa Leta; Anne Marie Fenstad; Stein Håkon Låstad Lygre et al. (2023). The use of antibiotic-loaded bone cement and systemic antibiotic prophylactic use in 2,971,357 primary total knee arthroplasties from 2010 to 2020: an international register-based observational study among countries in Africa, Europe, North America, and Oceania. (external link)
• Randi Margrete Hole; Anne Marie Fenstad; Jan-Erik Gjertsen et al. (2024). Influence of design features and brand of reverse shoulder arthroplasties on survivorship and reasons for revision surgery: results of 5,494 arthroplasties with up to 15 years’ follow-up reported to the Norwegian Arthroplasty Register 2007–2022. (external link)
• Cato Kjærvik; Jan-Erik Gjertsen; Eva Stensland et al. (2025). The influence of socioeconomic position on patient-reported outcome measures following hip fractures – a register-based observational study on 35,206 patients from the Norwegian hip fracture register 2014–2018. (external link)
• Kjell Matre; Leif Ivar Havelin; Jan-Erik Gjertsen et al. (2013). Intramedullary nails result in more reoperations than sliding hip screws in two-part intertrochanteric fractures. (external link)
• Cato Kjærvik; Jan-Erik Gjertsen; Eva Stensland et al. (2024). Patient-reported outcome measures in hip fracture patients: data on 35,206 patients from the Norwegian Hip Fracture Register, 2014 to 2018. (external link)
• Maya Maya Barbosa Silva; Jan-Erik Gjertsen; Irene Ohlen Moldestad et al. (2024). Effects of implant precoating and fat contamination on the stability of the tibial baseplate. (external link)
• Kirsten Marie Larsen Grønhaug; Eva Hansen Dybvik; Kjell Matre et al. (2023). Comparison of Intramedullary Nails in the Treatment of Trochanteric and Subtrochanteric Fractures: An Observational Study of 13,232 Fractures in the Norwegian Hip Fracture Register. (external link)
• Karola Pawloy; Anne Marie Fenstad; Tesfaye Hordofa Leta et al. (2023). No difference in risk of revision due to infection between clindamycin and cephalosporins as antibiotic prophylaxis in cemented primary total knee replacements: a report from the Norwegian Arthroplasty Register 2005–2020. (external link)
• Jan-Erik Gjertsen; Lars B. Engesæter; Ove Nord Furnes et al. (2008). The Norwegian Hip Fracture Register - Experiences after the first 2 years and 15,576 reported operations. (external link)
• Jan-Erik Gjertsen; Tarjei Vinje; Stein Atle Lie et al. (2008). Patient satisfaction, pain, and quality of life 4 months after displaced femoral neck fractures - A comparison of 663 fractures treated with internal fixation and 906 with bipolar hemiarthroplasty reported to the Norwegian Hip Fracture Register. (external link)
• Tove Tveitan Borgen; Åshild Bjørnerem; Lene Bergendal Solberg et al. (2019). Post-Fracture Risk Assessment: Target The Centrally Sited Fractures First! A Substudy of NoFRACT. (external link)
• Cato Kjærvik; Eva Stensland; Hanne Sigrun Byhring et al. (2020). Hip fracture treatment in Norway: deviation from evidence-based treatment guidelines: data from the Norwegian Hip Fracture Register. (external link)
• Sunniva Leer-Salvesen; Eva Hansen Dybvik; Lars B. Engesæter et al. (2018). Low-molecular-weight heparin for hip fracture patients treated with osteosynthesis: should thromboprophylaxis start before or after surgery? An observational study of 45,913 hip fractures reported to the Norwegian Hip Fracture Register. (external link)
• Kjell Matre; Leif Ivar Havelin; Jan-Erik Gjertsen et al. (2013). TRIGEN INTERTAN Intramedullary Nail Versus Sliding Hip Screw: A Prospective, Randomized Multicenter Study on Pain, Function, and Complications in 684 Patients with an Intertrochanteric or Subtrochanteric Fracture and One Year of Follow-up. (external link)
• Carl Erik Alm; Jan-Erik Gjertsen; Trude Basso et al. (2021). Trochanteric stabilizing plate in the treatment of trochanteric fractures: a scoping review. (external link)
• Tuva Elisabeth Garre-Fivelsdal; Jan-Erik Gjertsen; Eva Hansen Dybvik et al. (2023). A standardized clinical pathway for hip fracture patients is associated with reduced mortality: data from the Norwegian Hip Fracture Register. (external link)
• Målfrid Holen Kristoffersen; Eva Hansen Dybvik; Ole Martin Steihaug et al. (2020). Cognitive impairment influences the risk of reoperation after hip fracture surgery: results of 87,573 operations reported to the Norwegian Hip Fracture Register. (external link)
• Maria Holsen; Veronica Hovind; Haji Kedir Bedane et al. (2022). Geographical variation in orthopedic procedures in Norway: Cross-sectional population-based study. (external link)
• Tom Lian; Eva Hansen Dybvik; Jan Erik Gjertsen et al. (2020). Compliance with national guidelines for antibiotic prophylaxis in hip fracture patients: A quality assessment study of 13 329 patients in the Norwegian Hip Fracture Register. (external link)
• Cecilia Rogmark; Anne Marie Fenstad; Olof Leonardsson et al. (2014). Posterior approach and uncemented stems increases the risk of reoperation after hemiarthroplasties in elderly hip fracture patients. (external link)
• Linda Chokotho; Brian C. Lau; Devin Conway et al. (2019). Validation of chichewa short musculoskeletal function assessment (SMFA) questionnaire: A cross-sectional study. (external link)
• Ove Nord Furnes; Jan-Erik Gjertsen; Eivind Inderhaug et al. (2023). I starten var det Hofteregisteret- så ble vi flere. Nasjonalt Register for Leddproteser, Nasjonalt Hoftebruddregister, Nasjonalt Korsbåndregister og Nasjonalt Barnehofteregister. (external link)
• Christian Thomas Pollmann; Jan H Røtterud; Jan-Erik Gjertsen et al. (2019). Fast track hip fracture care and mortality – an observational study of 2230 patients. (external link)
• Randi Margrete Hole; Anne Marie Fenstad; Jan-Erik Gjertsen et al. (2021). Thromboprophylaxis in primary shoulder arthroplasty does not seem to prevent death: a report from the Norwegian Arthroplasty Register 2005–2018. (external link)
• Tesfaye Hordofa Leta; Richard N. Chang; Anne Marie Fenstad et al. (2024). Number of Doses of Systemic Antibiotic Prophylaxis May Be Reduced in Cemented Primary Knee Arthroplasty Irrespective of Use of Antibiotic in the Cement: A Multiregistry-Based Meta-Analysis. (external link)
• Kjell Matre; Leif Ivar Havelin; Jan-Erik Gjertsen et al. (2013). Sliding hip screw versus IM nail in reverse oblique trochanteric and subtrochanteric fractures. A study of 2716 patients in the Norwegian Hip Fracture Register. (external link)
• Cato Kjærvik; Jan-Erik Gjertsen; Eva Stensland et al. (2024). Impact of physiotherapy access on health-related quality of life following hip fracture: an observational study on 30 752 hip fractures from the Norwegian Hip Fracture Register 2014–2018. (external link)
• Andrea Boutera; Eva Hansen Dybvik; Geir Hallan et al. (2019). Is there a weekend effect after hip fracture surgery? A study of 74,410 hip fractures reported to the Norwegian Hip Fracture Register. (external link)
• Camilla Andreasen; Cecilie Dahl; Lene Bergendal Solberg et al. (2023). Epidemiology of forearm fractures in women and men in Norway 2008–2019. (external link)
• Michelle Khan; Jan-Erik Gjertsen; Anne Marie Fenstad et al. (2023). Cementing techniques for total ktnee arthroplasty in Norwegian hospitals; a questionnaire-based study. (external link)
• Anders Sund; Eva Hansen Dybvik; Jan-Erik Gjertsen (2023). Orthopaedic surgeons’ ability to detect pathologic hip fractures: review of 1484 fractures reported to the Norwegian Hip Fracture Register. (external link)
• Håvard Dale; Sjur Børsheim; Torbjørn Kristensen et al. (2019). Fixation, sex and age: highest risk of revision for uncemented stems in elderly women- data from 66,995 primary total hip arthroplasties in the Norwegian arthroplasty register.. (external link)
• Ammar Jobory; Johan Kärrholm; Søren Overgaard et al. (2019). Reduced revision risk for dual-mobility cup in total hip replacement due to hip fracture: A matched-pair analysis of 9,040 cdases from the Nordic Arthroplasty Register Association (NARA). (external link)
• Jan-Erik Gjertsen; Jonas Meling Fevang; Kjell Matre et al. (2011). Clinical outcome after undisplaced femoral neck fractures. (external link)
• Alma B. Pedersen; Ina Trolle Andersen; Søren Overgaard et al. (2019). Optimal duration of anticoagulant thromboprophylaxis in total hip arthroplasty: new evidence in 55,540 patients with osteoarthritis from the Nordic Arthroplasty Register Association (NARA) group. (external link)
• Randi Margrete Hole; Anne Marie Fenstad; Jan-Erik Gjertsen et al. (2023). The Delta III and Delta Xtend reverse shoulder arthroplasty—risk of revision and failure mechanisms: a report on 3650 cases from the Norwegian Arthroplasty Register 1994-2021. (external link)
• Andreas Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2014). Increased risk of revision with hamstring tendon grafts compared with patellar tendon grafts after anterior cruciate ligament reconstruction: A study of 12,643 patients from the norwegian cruciate ligament registry, 2004-2012. (external link)
• Anja Myhre Hjelle; Jan-Erik Gjertsen; Ellen Margrete Apalset et al. (2020). No association between osteoporosis and AO classification of distal radius fractures: an observational study of 289 patients. (external link)
• Thomas Abel Woldeyesus; Jan-Erik Gjertsen; Ingvild Dalen et al. (2024). Preoperative CT improves the assessment of stability in trochanteric hip fractures. (external link)
• Stefan Bartels; Jan-Erik Gjertsen; Frede Jon Frihagen et al. (2019). Low bone density and high morbidity in patients between 55 and 70 years with displaced femoral neck fractures: A case-control study of 50 patients vs 150 normal controls. (external link)
• Amara Ahmad; Emma Helene Egeland; Eva Hansen Dybvik et al. (2024). Equivalent mortality after operation with sliding hip screw or intramedullary nail for trochanteric AO/OTA A1 and A2 fractures reported in the Norwegian Hip Fracture Register 2008 to 2020. (external link)
• Espen Midttun; Morten Torheim Andersen; Lars Engebretsen et al. (2022). Good validity in the Norwegian Knee Ligament Register: assessment of data quality for key variables in primary and revision cruciate ligament reconstructions from 2004 to 2013. (external link)
• Linda Chokotho; Claire A Donnelley; Sven Young et al. (2021). Cost utility analysis of intramedullary nailing and skeletal traction treatment for patients with femoral shaft fractures in Malawi. (external link)
• Stefan Bartels; Jan-Erik Gjertsen; Frede Jon Frihagen et al. (2017). High failure rate after internal fixation and beneficial outcome after arthroplasty in treatment of displaced femoral neck fractures in patients between 55 and 70 years. An observational study of 2,713 patients reported to the Norwegian Hip Fracture Register. (external link)
• Jan-Erik Gjertsen; Valborg Baste; Jonas Meling Fevang et al. (2016). Quality of life following hip fractures: Results from the Norwegian hip fracture register. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2016). Outcomes of unicompartmental knee arthroplasty after aseptic revision to total knee arthroplasty: a comparative study of 768 TKAs and 578 UKAs revised to TKAs from the norwegian arthroplasty register (1994 to 2011). (external link)
• Carl Erik Alm; Frede Frihagen; Eva Hansen Dybvik et al. (2021). Implants for trochanteric fractures in Norway: the role of the trochanteric stabilizing plate—a study on 20,902 fractures from the Norwegian hip fracture register 2011–2017. (external link)
• Helena Kames Kjeldgaard; Haakon Eduard Meyer; Martin O’Flaherty et al. (2022). Impact of Total Hip Replacements on the Incidence of Hip Fractures in Norway During 1999–2019. A Norwegian Epidemiologic Osteoporosis Studies (NOREPOS) Study. (external link)
• Silje Marie Melbye; Sofie Cecilia Dietrich Haug; Anne Marie Fenstad et al. (2021). How Does Implant Survivorship Vary with Different Corail Femoral Stem Variants? Results of 51,212 Cases with Up to 30 Years Of Follow-up from the Norwegian Arthroplasty Register. (external link)
• Jan-Erik Gjertsen; Tarjei Vinje; Lars B. Engesæter et al. (2010). Internal screw fixation compared with bipolar hemiarthroplasty for treatment of displaced femoral neck fractures in elderly patients. (external link)
• Jan-Erik Gjertsen; Eva Hansen Dybvik; Ove Furnes et al. (2017). Improved outcome after hip fracture surgery in Norway: 10-year results from the Norwegian Hip Fracture Register. (external link)
• Camilla Andreasen; Cecilie Dahl; Frede Frihagen et al. (2025). Fracture liaison service (FLS) is associated with lower subsequent fragility fracture risk and mortality: NoFRACT (the Norwegian capture the fracture initiative). (external link)
• Torbjørn Kristensen; Eva Hansen Dybvik; Ove Furnes et al. (2018). More reoperations for periprosthetic fracture after cemented hemiarthroplasty With polished taper-slip stems than after anatomical and straight stems in the treatment of hip fractures.. (external link)
• Leonard Banza Ngoie; Jared Gallaher; Eva Hansen Dybvik et al. (2018). The rise in road traffic injuries in Lilongwe, Malawi: A snapshot of the growing epidemic of trauma in low income countries. (external link)
• Tove Tveitan Borgen; Åshild Bjørnerem; Lene Bergendal Solberg et al. (2019). Determinants of trabecular bone score and prevalent vertebral fractures in women with fragility fractures: a cross-sectional sub-study of NoFRACT. (external link)
• Christian Thomas Pollmann; Fredrik Andreas Dahl; Jan H Røtterud et al. (2020). Surgical site infection after hip fracture – mortality and risk factors: an observational cohort study of 1,709 patients. (external link)
• Paul Johan Høl; Anders Mølster; Nils Roar Gjerdet et al. (2006). Hip fracture implants increase serum metal levels. (external link)
• Anders Myhre Refsum; Uy Viet Nguyen; Jan Erik Gjertsen et al. (2019). Cementing technique for primary knee arthroplasty: a scoping review. (external link)
• Christian Thomas Pollmann; Jan-Erik Gjertsen; Håvard Dale et al. (2020). Operative approach influences functional outcome after DAIR for infected total hip arthroplasty. (external link)
• Camilla Andreasen; Lene Bergendal Solberg; Trude Basso et al. (2018). Effect of a Fracture Liaison Service on the Rate of Subsequent Fracture Among Patients With a Fragility Fracture in the Norwegian Capture the Fracture Initiative (NoFRACT): A Trial Protocol. (external link)
• Håvard Dale; Sjur Børsheim; Torbjørn Kristensen et al. (2019). Perioperative, short, and long-term mortality related to fixation in primary total hip arthroplasty: a study of 79,557 patients in the Norwegian Arthroplasty Register. (external link)
• Tone Kristin Omsland; Lene Bergendal Solberg; Åshild Marit Bjørnerem et al. (2023). Validation of forearm fracture diagnoses in administrative patient registers. (external link)
• Linda Chokotho; Hao-Hua Wu; David Shearer et al. (2020). Outcome at 1 year in patients with femoral shaft fractures treated with intramedullary nailing or skeletal traction in a low-income country: a prospective observational study of 187 patients in Malawi. (external link)
• Torbjørn Kristensen; Tarjei Vinje; Leif Ivar Havelin et al. (2016). Posterior approach compared to direct lateral approach resulted in better patient-reported outcome after hemiarthroplasty for femoral neck fracture: 20,908 patients from the Norwegian Hip Fracture Register. (external link)
• Sunniva Leer-Salvesen; Lars B. Engesæter; Eva Hansen Dybvik et al. (2019). Does time from fracture to surgery affect mortality and intraoperative medical complications for hip fracture patients?. (external link)
• Tesfaye Hordofa Leta; Stein Atle Lie; Anne Marie Fenstad et al. (2024). Periprosthetic Joint Infection After Total Knee Arthroplasty With or Without Antibiotic Bone Cement. (external link)
• Målfrid Holen Kristoffersen; Eva Hansen Dybvik; Ole Martin Steihaug et al. (2021). Patient-reported outcome measures after hip fracture in patients with chronic cognitive impairment: results from 34.675 patients in the Norwegian Hip Fracture Register. (external link)
• Cato Kjærvik; Jan-Erik Gjertsen; Eva Stensland et al. (2022). Modifiable and non-modifiable risk factors in hip fracture mortality in Norway, 2014 to 2018 : a linked multiregistry study. (external link)
• Sunniva Leer-Salvesen; Eva Hansen Dybvik; Ola Einar Dahl et al. (2016). Postoperative start compared to preoperative start of low-molecular-weight heparin increases mortality in patients with femoral neck fractures: An observational study of 20,241 hemiprostheses reported to the Norwegian Hip Fracture Register. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Johannes Cornelis Schrama et al. (2019). Outcome of revision surgery for infection after total knee arthroplasty: Results of 3 surgical strategies. (external link)
• Kirsten Marie Larsen Grønhaug; Eva Hansen Dybvik; Jan-Erik Gjertsen et al. (2022). Subsequent ipsi- and contralateral femoral fractures after intramedullary nailing of a trochanteric or subtrochanteric fracture: a cohort study on 2012 patients. (external link)
• Dennis Vinther; Aurelie Mailhac; Ina Trolle Andersen et al. (2022). Association between duration of anticoagulant thromboprophylaxis and revision rate in primary total hip arthroplasty: a Danish and Norwegian nationwide cohort study. (external link)
• Thea Emily Benson; Ina Trolle Andersen; Søren Overgaard et al. (2022). Association of perioperative thromboprophylaxis on revision rate due to infection and aseptic loosening in primary total hip arthroplasty - new evidence from the Nordic Arthroplasty Registry Association (NARA). (external link)
• Målfrid Holen Kristoffersen; Eva Hansen Dybvik; Ole Martin Steihaug et al. (2019). Validation of orthopaedic surgeons' assessment of cognitive function in patients with acute hip fracture. (external link)
• Cato Kjærvik; Jan-Erik Gjertsen; Lars B. Engesæter et al. (2021). Waiting time for hip fracture surgery: hospital variation, causes, and effects on postoperative mortality data on 37,708 operations reported to the Norwegian Hip fracture Register from 2014 to 2018. (external link)
• Nolan S. Horner; Kirsten Marie Larsen Grønhaug; Eleonor Svantesson et al. (2020). Timing of hip hemiarthroplasty and the influence on prosthetic joint infection. (external link)
• Tove Tveitan Borgen; Cathrine Brunborg; Frede Frihagen et al. (2025). External validation of FRISBEE 2-year and 5-year fracture prediction models in a fracture liaison service cohort. (external link)
• Stein Atle Lie; Anne Marie Fenstad; Stein Håkon Låstad Lygre et al. (2022). Kaplan-Meier and Cox Regression Are Preferable for the Analysis of Time to Revision of Joint Arthroplasty: Thirty-One Years of Follow-up for Cemented and Uncemented THAs Inserted from 1987 to 2000 in the Norwegian Arthroplasty Register. (external link)
• Antony Johansen; David Golding; Louise Brent et al. (2017). Using national hip fracture registries and audit databases to develop an international perspective. (external link)
• Linda Chokotho; Nyengo Mkandawire; Devin Conway et al. (2017). Validation and reliability of the Chichewa translation of the EQ-5D quality of life questionnaire in adults with orthopaedic injuries in Malawi. (external link)
• Torbjørn Kristensen; Eva Hansen Dybvik; Målfrid Holen Kristoffersen et al. (2020). Cemented or uncemented hemiarthroplasty for femoral neck fracture? Data from the Norwegian Hip Fracture Register. (external link)
• Martyn Parker; Pradyumna Raval; Jan-Erik Gjertsen (2018). Nail or plate fixation for A3 trochanteric hip fractures: A systematic review of randomised controlled trials. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2015). Secondary patella resurfacing in painful non-resurfaced total knee arthroplasties: A study of survival and clinical outcome from the Norwegian Arthroplasty Register (1994–2011). (external link)
• Ove Talsnes; Tarjei Vinje; Jan-Erik Gjertsen et al. (2013). Perioperative mortality in hip fracture patients treated with cemented and uncemented hemiprosthesis: a register study of 11,210 patients. (external link)
• Stefan Bartels; Torbjørn Kristensen; Jan-Erik Gjertsen et al. (2022). Total Hip Arthroplasty Leads to Better Results After Low-Energy Displaced Femoral Neck Fracture in Patients Aged 55 to 70 Years: A Randomized Controlled Multicenter Trial Comparing Internal Fixation and Total Hip Arthroplasty. (external link)
• John Magne Hoseth; Tommy Frøseth Aae; Rune Bruhn Jakobsen et al. (2023). Compensation Claims After Hip Fracture Surgery in Norway 2008-2018. (external link)
• Tove Tveitan Borgen; Åshild Bjørnerem; Lene Bergendal Solberg et al. (2019). High prevalence of vertebral fractures and low trabecular bone score in patients with fragility fractures: A cross-sectional sub-study of NoFRACT. (external link)
• Anja Myhre Hjelle; Ellen M. Apalset; Jan-Erik Gjertsen et al. (2021). Associations of overweight, obesity and osteoporosis with ankle fractures. (external link)
• Kirsten Marie Larsen Grønhaug; Eva Hansen Dybvik; Kjell Matre et al. (2022). Intramedullary nail versus sliding hip screw for stable and unstable trochanteric and subtrochanteric fractures: 17,341 patients from the Norwegian Hip Fracture Register. (external link)
• Jan Erik Gjertsen; Anne Marie Fenstad; Olof Leonardsson et al. (2014). Hemiarthroplasties after hip fractures in Norway and Sweden: A collaboration between the Norwegian and Swedish national registries. (external link)
• Dennis Vinther; Reimar W. Thomsen; Ove Nord Furnes et al. (2024). Impact of diabetes on the risk of subsequent fractures in 92,600 patients with an incident hip fracture: A Danish nationwide cohort study 2004–2018. (external link)
• Reyhaneh Lashkari; Cecilie Dahl; Tove Tveitan Borgen et al. (2025). Distal forearm fracture risk in a cohort of female and male immigrants and Norwegian-born residents aged 20 to 79 years in Norway. (external link)
• Torbjørn Kristensen; Tarjei Vinje; Leif Ivar Havelin et al. (2017). Posterior approach compared to Direct lateral approach resulted in better patient-reported outcome after hemiarthroplsty for femoral neck fracture. (external link)
• Michelle Khan; Stein Håkon Låstad Lygre; Mona Badawy et al. (2025). Association of tourniquet use on short-term implant survival after primary total knee arthroplasty: a study of 24,249 knees from the Norwegian Arthroplasty Register. (external link)
• Leonard Banza Ngoie; Eva Hansen Dybvik; Geir Hallan et al. (2022). The unmet need for treatment of children with musculoskeletal impairment in Malawi. (external link)
• Leonard Banza Ngoie; Eva Hansen Dybvik; Geir Hallan et al. (2021). Prevalence, causes and impact of musculoskeletal impairment in Malawi: A national cluster randomized survey. (external link)
• Ane Lyseid Authen; Eva Hansen Dybvik; Ove Furnes et al. (2018). Surgeon's experience level and risk of reoperation after hip fracture surgery: an observational study on 30,945 patients in the Norwegian Hip Fracture Register 2011-2015. (external link)
• Olav Lutro; Marianne Bollestad; Tesfaye Hordofa Leta et al. (2025). How many doses and what type of antibiotic should be used as systemic antibiotic prophylaxis in primary hip and knee arthroplasty? A register-based study on 301,204 primary total and hemi-hip and total knee arthroplasties in Norway 2005–2023. (external link)
• Jan-Erik Gjertsen (2020). CORR Insights: Is the Survivorship of Birmingham Hip Resurfacing Better Than Selected Conventional Hip Arthroplasties in Men Younger Than 65 Years of Age? A Study from the Australian Orthopaedic Association National Joint Replacement Registry.. (external link)
• Sunniva Leer-Salvesen; Eva Hansen Dybvik; Anette Hylen Ranhoff et al. (2020). Do direct oral anticoagulants (DOACs) cause delayed surgery, longer length of hospital stay, and poorer outcome for hip fracture patients?. (external link)
• Jan-Erik Gjertsen; Stein Atle Lie; Tarjei Vinje et al. (2012). More re-operations after uncemented than cemented hemiarthroplasty used in the treatment of displaced fractures of the femoral neck: an observational study of 11,116 hemiarthroplasties from a national register. (external link)
• Jan-Erik Gjertsen; Daniel Hoseth Nilsen; Ove Nord Furnes et al. (2024). Promoting cemented fixation of the femoral stem in elderly female hip arthroplasty patients and elderly hip fracture patients: a retrospective cohort study from the Norwegian Arthroplasty Register and the Norwegian Hip Fracture Register. (external link)

Conference abstract

• Haakon Eduard Meyer; Jan-Erik Gjertsen; Anne Marie Fenstad et al. (2025). The influence of height on the risk of hip fracture differs by fracture type: A NOREPOS study utilizing data from The Norwegian Hip Fracture Register. (external link)
• Helena Kames Kjeldgaard; Kristin Holvik; Anne Marie Fenstad et al. (2021). The Impact of Total Hip Replacements on Hip Fracture Incidence in the Norwegian Population. A NOREPOS Study. (external link)
• Andreas Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2017). New Trauma is the Most Common Cause of Revision after primary anterior cruciate ligament reconstruction – a study from the Norwegian Knee Ligament Registry 2004–2015. (external link)
• Andreas Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2014). Increased risk of revision with hamstring graft compared to patellar graft after anterior cruciate ligament reconstruction; a study of 12,643 cases from the Norwegian Cruciate Ligament Registry 2004–2012. (external link)
• Helena Kames Kjeldgaard; Haakon Eduard Meyer; Martin O’Flaherty et al. (2022). OP93 Impact of total hip replacements on the incidence of hip fractures in Norway during 1999–2019. A NOREPOS study. (external link)

Conference lecture

• Cato Kjærvik; Jan-Erik Gjertsen; Eva Stensland et al. (2024). Tilgang til fysioterapi etter hoftebrudd påvirker helserelatert livskvalitet. (external link)
• Michelle Khan; Stein Håkon Låstad Lygre; Geir Hallan et al. (2023). Bruk av blodtomhet ved totalprotese i kne- 3 års oppfølging (2018-2021) med data fra Nasjonalt register for leddproteser. (external link)
• Cato Kjærvik; Odd Søreide; Eva Stensland et al. (2022). Socioeconomic factors - effects on outcome after hip fractures. (external link)
• Cato Kjærvik; Odd Søreide; Jan-Erik Gjertsen et al. (2022). Effects of adherence to guidelines in treatment of displaced femoral neck fractures. (external link)
• Andreas Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2017). New Trauma is the Most Common Cause of Revision after primary anterior cruciate ligament reconstruction – a study from the Norwegian Knee Ligament Registry 2004–2015. (external link)
• Erik Bråtveit; Jan-Erik Gjertsen; Cato Kjærvik (2023). Sosioøkonomiske forhold påvirker pasientrapporterte utfallsmål (PROMs) etter hoftebrudd. (external link)
• Cato Kjærvik; Jan-Erik Gjertsen; Odd Søreide et al. (2020). Betydelig variasjon i etterlevelse etter retningslinjer for behandling av dislokerte lårhalsbrudd. (external link)
• Cato Kjærvik; Eva Stensland; Hanne Sigrun Byhring et al. (2020). Effekt av etterlevelse av retningslinjer for behandling av dislokerte lårhalsbrudd. (external link)
• Cato Kjærvik; Eva Stensland; Odd Søreide et al. (2019). Sykehusegenskaper påvirker overlevelse etter hoftebrudd. (external link)
• Michelle Khan; Jan-Erik Gjertsen; Anders Myhre Refsum et al. (2020). En spørreundersøkelse om sementeringsteknikker som brukes ved total kneprotesekirurgi ved norske sykehus. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2015). Sammenligning av 768 total- og 578 uni-kneproteser reviderte til total kneproteser fra Nasjonalt Register for Leddproteser (1994-2011). (external link)
• Thomas Abel Woldeyesus; Jan-Erik Gjertsen; Ingvild Dalen et al. (2021). Diagnostikk av trokantære hoftebrudd - sammenligning av røntgen og CT. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2014). Revisjon av total kneprotese uten patellakomponent med kun innsetting av patellakomponent.. (external link)
• Thomas Abel Woldeyesus; Aksel Paulsen; Jan-Erik Gjertsen et al. (2022). RANDOMISERT KONTROLLERT STUDIE; INTRAMEDULLÆR MARGNAGLE VERSUS PROTESE VED USTABILE TROKANTÆRE HOFTEBRUDD. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Pål Håvding et al. (2017). Resultater ved revisjon for infisert kneprotese. En observasjons studie fra Nasjonalt Register for Leddproteser (1994-2016).. (external link)
• Andreas Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2014). Increased risk of revision with hamstring graft compared to patellar graft after anterior cruciate ligament reconstruction; a study of 12,643 cases from the Norwegian Cruciate Ligament Registry 2004–2012. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Pål Høvding et al. (2018). Revision of infected total knee arthroplasty: Do surgical strategies matter?. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Pål Høvding et al. (2018). Outcome of revision surgery for infected total knee arthroplasty: Do surgical strategies matter?. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Pål Høvding et al. (2018). Result of revision surgery for infected total knee arthroplasty. Do surgical strategies matter?. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2016). The outcome of unicompartmental knee arthroplasties after aseptic revision into total knee arthroplasties. A comparative study of 768 total knees and 578 uni knees revised to total knees reported to Norwegian Arthroplasty Register (1994-2011).. (external link)
• Tesfaye Hordofa Leta; Arne Kr Skredderstuen; Stein Håkon Låstad Lygre et al. (2015). The Outcome of unicompartmental knee arthroplasties after aseptic revision into total knee arthroplasties. A comparative study of 768 total and 578 uni-knees revised to total knees reported to the Norwegian Arthroplasty Register (1994-2011).. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2015). Addition of patella Component in painful non-resurfaced TKAs; does it helps?. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2015). The outcome of unicompartmental knee arthroplastis after aseptic revision into total knee arthroplasties.. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2016). The outcome of unicompartmental knee arthroplasties after aseptic revision into total knee arthroplasties. A comparative study of 768 total knees and 578 uni knees revised to total knees reported to Norwegian Arthroplasty Register (1994-2011.. (external link)
• Tesfaye Hordofa Leta; Stein Håkon Låstad Lygre; Arne Kr Skredderstuen et al. (2016). The outcome of unicompartmental knee arthroplasties after aseptic revision into total knee arthroplasties. A comparative study of 768 total knees and 578 uni knees revised to total knees reported to Norwegian Arthroplasty Register (1994-2011). (external link)
• A Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2016). New trauma is the most common cause of revision after primary anterior cruciate ligament reconstruction - a study from the Norwegian knee ligament registry 2004-2015. (external link)

Letter to the editor

• Stein Atle Lie; Leif Ivar Havelin; Anne Marie Fenstad et al. (2014). Re: a statistical analysis of ankle prosthesis from the Norwegian Arthroplasty Register. (external link)
• Kjell Matre; Leif Ivar Havelin; Jan-Erik Gjertsen et al. (2013). Reply to Letter to the Editor: Intramedullary Nails Result in More Reoperations Than Sliding Hip Screws in Two-part Intertrochanteric Fractures. (external link)
• Margareta Hedström; Wilhelmina Ekström; Amer Al-Ani et al. (2019). High failure rate after internal fixation and beneficial outcome after arthroplasty in treatment of displaced femoral neck fractures in patients between 55 and 70 years. (external link)
• Torbjørn Kristensen; Jan-Erik Gjertsen (2020). Valg av protese ved lårhalsbrudd | Tidsskrift for Den norske legeforeningValg av protese ved lårhalsbrudd. (external link)
• Torbjørn Kristensen; Eva Hansen Dybvik; Målfrid Holen Kristoffersen et al. (2020). Reply to the Letter to the Editor: Cemented or uncemented Hemiarthroplasty for femoral neck fracture? Data from the Norwegian Hip Fracture Register. (external link)
• Jan-Erik Gjertsen; Stein Atle Lie; Tarjei Vinje et al. (2013). Authors' reply Cobb correspondence re: J-E. Gjertsen, S. A. Lie, T. Vinje, et al. More re-operations after uncemented than cemented hemiarthroplasty used in the treatment of displaced fractures of the femoral neck: An observational study of 11 116 hemiarthroplasties from a national register. J Bone Joint Surg [Br] 2012;94-B:1113-1119. (external link)

Conference poster

• Camilla Andreasen; Cecilie Dahl; Frede Frihagen et al. (2023). Fracture Liaison Services and Subsequent Fracture Risk: a multicenter, pragmatic, Stepped-Wedge Cluster-Randomized controlled trial. (external link)
• Tove Tveitan Borgen; Åshild Bjørnerem; Lene Bergendal Solberg et al. (2019). Individuals with Central Fractures have More Prevalent Vertebral Fractures, Lower Trabecular Bone Score and Lower BMD than Individuals with Peripheral Fractures: a Sub-study of NoFRACT. (external link)
• Tove Tveitan Borgen; Åshild Bjørnerem; Lene Bergendal Solberg et al. (2019). Determinants of Trabecular Bone Score and Vertebral Fracture Status in Women With Fragility Fractures: A Cross-sectional Sub-study of NoFRACT. (external link)

Academic literature review

• Tesfaye Hordofa Leta; Jan-Erik Gjertsen; Håvard Dale et al. (2021). Antibiotic-loaded bone cement in prevention of periprosthetic joint infections in primary total knee arthroplasty: A register-based multicentre randomised controlled non-inferiority trial (ALBA trial). (external link)

Doctoral thesis (PhD)

• Jan-Erik Gjertsen (2009). Surgical treatment of hip fractures in Norway. (external link)

Lecture

• Ane Djuv; Lars Fosse; Aksel Paulsen et al. (2019). Retrospektiv pilotstudie for komplikasjoner ved ustabile trokantære frakturer operert med margnagle eller protese. (external link)

Editorial/Leader article

• Jan-Erik Gjertsen (2019). Should Total Hip Arthroplasty Be Used for Hip Fracture?. (external link)
• Torbjørn Kristensen; Jan-Erik Gjertsen (2020). Valg av protese ved lårhalsbrudd. (external link)

Academic book chapter

• A Persson; Knut Fjeldsgaard; Jan-Erik Gjertsen et al. (2016). New trauma is the most common cause of revision after primary anterior cruciate ligament reconstruction - a study from the Norwegian knee ligament registry 2004-2015. (external link)

Journal corrigendum

• Sunniva Leer-Salvesen; Eva Hansen Dybvik; Anette Hylen Ranhoff et al. (2020). Correction to: Do direct oral anticoagulants (DOACs) cause delayed surgery, longer length of hospital stay, and poorer outcome for hip fracture patients? (European Geriatric Medicine, (2020), 10.1007/s41999-020-00319-w). (external link)

See a complete overview of publications in NVA.