Geir Hallan
About
Geir Hallan is a scholar working on Surgery, Epidemiology and Public Health, Environmental and Occupational Health.
According to data from OpenAlex, Geir Hallan has authored 98 papers receiving a total of 2.7k indexed citations (citations by other indexed papers that have themselves been cited), including 90 papers in Surgery, 10 papers in Epidemiology and 5 papers in Public Health, Environmental and Occupational Health. Recurrent topics in Geir Hallan's work include Orthopaedic implants and arthroplasty (69 papers), Total Knee Arthroplasty Outcomes (66 papers) and Orthopedic Infections and Treatments (64 papers). Geir Hallan is often cited by papers focused on Orthopaedic implants and arthroplasty (69 papers), Total Knee Arthroplasty Outcomes (66 papers) and Orthopedic Infections and Treatments (64 papers). Geir Hallan collaborates with scholars based in Norway, Sweden and Denmark. Geir Hallan's co-authors include Ove Furnes, Lars B. Engesæter, Leif I Havelin, Stein Atle Lie, Håvard Dale, Birgitte Espehaug, Anne Marie Fenstad, Leif Ivar Havelin, Jan‐Erik Gjertsen and Søren Overgaard and has published in prestigious journals such as Blood, PLoS ONE and Journal of Bone and Joint Surgery.
In The Last Decade
Geir Hallan
91 papers receiving 2.6k citations
Peers
Geir Hallan
Patrick Sadoghi Austria
Samik Banerjee United States
Arthur L. Malkani United States
Edwin P. Su United States
Brett D. Crist United States
Gwo‐Chin Lee United States
Charles L. Nelson United States
Bhaveen H. Kapadia United States
Brent A. Lanting Canada
Matthew S. Austin United States
Citations per year, relative to Geir Hallan Geir Hallan (= 1×)
peers
Patrick Sadoghi
Countries citing papers authored by Geir Hallan
Since
Specialization
Citations
This map shows the geographic impact of Geir Hallan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Geir Hallan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Geir Hallan more than expected).
Fields of papers citing papers by Geir Hallan
Since
Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences
This network shows the impact of papers produced by Geir Hallan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Geir Hallan. The network helps show where Geir Hallan may publish in the future.
Co-authorship network of co-authors of Geir Hallan
This figure shows the co-authorship network connecting the top 25 collaborators of Geir Hallan. A scholar is included among the top collaborators of Geir Hallan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Geir Hallan. Geir Hallan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.
All Works
1.
Lygre, Stein Håkon Låstad, Mona Badawy, Otto Schnell Husby, 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. Acta Orthopaedica. 96. 547–554.
2.
Leta, Tesfaye Hordofa, Jan‐Erik Gjertsen, Geir Hallan, 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. Acta Orthopaedica. 96. 217–225.
3.
Deere, Kevin, Michael R. Whitehouse, Marina Torre, et al.. (2024). The completeness of national hip and knee replacement registers. Acta Orthopaedica. 95. 654–660.
4.
Gjertsen, Jan‐Erik, 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. Acta Orthopaedica. 95. 130–137.
5.
Hallan, Geir, Anne Marie Fenstad, Stein Håkon Låstad Lygre, et al.. (2024). Polyethylene wear and cup migration of cemented total hip arthroplasty with femoral heads made of oxidized zirconium, steel, or cobalt chromium: a 10-year secondary analysis from a randomized trial using radiostereometry. Acta Orthopaedica. 95. 578–585.
6.
Venäläinen, Mikko S., Antti Eskelinen, Anne Marie Fenstad, et al.. (2024). Prediction of Early Adverse Events After THA : A Comparison of Different Machine‐Learning Strategies Based on 262,356 Observations From the Nordic Arthroplasty Register Association (NARA ) Dataset. ACR Open Rheumatology. 6(10). 669–677.
7.
Hole, R, Anne Marie Fenstad, Jan‐Erik Gjertsen, Geir Hallan, & Ove Furnes. (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. Acta Orthopaedica. 95. 463–471.
8.
Dybvik, Eva, et al.. (2023). Poor survivorship of total ankle replacements. 1368 cases from the period 1994–2021 in the Norwegian arthroplasty register. Foot and Ankle Surgery. 29(8). 603–610.
9.
Fenstad, Anne Marie, Tesfaye Hordofa Leta, Geir Hallan, 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. Acta Orthopaedica. 94. 404–409.
10.
Nordsletten, Lars, Jan Erik Madsen, Eva Dybvik, et al.. (2023). Long-term follow-up and survival of delayed total hip arthroplasty following acetabular fracture: a matched cohort study of 552 cases from the Norwegian Arthroplasty Register. Hip International. 34(3). 396–401.
11.
Johannessen, Anne Christine, Peter Ellison, Ove Furnes, et al.. (2022). Inflammatory tissue reactions around aseptically loose cemented hip prostheses: A retrieval study of the Spectron EF stem with Reflection All‐Poly acetabular cup. Journal of Biomedical Materials Research Part B Applied Biomaterials. 110(7). 1624–1636.
12.
Høl, Paul Johan, et al.. (2022). Similarly low blood metal ion levels at 10‐years follow‐up of total hip arthroplasties with Oxinium, CoCrMo, and stainless steel femoral heads. Data from a randomized clinical trial. Journal of Biomedical Materials Research Part B Applied Biomaterials. 111(4). 821–828.
13.
Banza, Leonard, Eva Dybvik, Geir Hallan, et al.. (2022). The unmet need for treatment of children with musculoskeletal impairment in Malawi. BMC Pediatrics. 22(1). 67–67.
14.
Kärrholm, Johan, Søren Overgaard, Alma B Pedersen, et al.. (2019). Reduced Revision Risk for Dual-Mobility Cup in Total Hip Replacement Due to Hip Fracture. Journal of Bone and Joint Surgery. 101(14). 1278–1285.
15.
Leta, Tesfaye Hordofa, Stein Håkon Låstad Lygre, Geir Hallan, et al.. (2019). Outcome of Revision Surgery for Infection After Total Knee Arthroplasty. JBJS Reviews. 7(6). e4–e4.
16.
Mäkelä, Keijo, Ove Furnes, Geir Hallan, et al.. (2019). The benefits of collaboration: the Nordic Arthroplasty Register Association. EFORT Open Reviews. 4(6). 391–400.
17.
Petursson, Gunnar, Anne Marie Fenstad, Øystein Gøthesen, et al.. (2018). Computer-Assisted Compared with Conventional Total Knee Replacement. Journal of Bone and Joint Surgery. 100(15). 1265–1274.
18.
Rasmussen, Jeppe Vejlgaard, Stig Brorson, Geir Hallan, et al.. (2016). Is it feasible to merge data from national shoulder registries? A new collaboration within the Nordic Arthroplasty Register Association. Journal of Shoulder and Elbow Surgery. 25(12). e369–e377.
19.
Hailer, Nils P., Stergios Lazarinis, Keijo Mäkelä, et al.. (2014). Hydroxyapatite coating does not improve uncemented stem survival after total hip arthroplasty!. Acta Orthopaedica. 86(1). 18–25.
20.
Young, Sven, Stein Atle Lie, Geir Hallan, et al.. (2011). Low infection rates after 34,361 intramedullary nail operations in 55 low- and middle-income countries. Acta Orthopaedica. 82(6). 737–743.
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.
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