Elliot Sappey-Marinier1, Cécile Batailler2, John Swan2, Matthieu Malatray2, Laurence Cheze3, Elvire Servien2,4, Sébastien Lustig2,3. 1. Orthopaedics Surgery and Sports Medicine Department, FIFA Medical Center of Excellence, Croix-Rousse Hospital, Lyon University Hospital de la Croix Rousse, 103 grande rue, 69004, Lyon, France. elliot.sappey-marinier@chu-lyon.fr. 2. Orthopaedics Surgery and Sports Medicine Department, FIFA Medical Center of Excellence, Croix-Rousse Hospital, Lyon University Hospital de la Croix Rousse, 103 grande rue, 69004, Lyon, France. 3. Univ Lyon, Claude Bernard Lyon 1 University, IFSTTAR LBMC UMR-T9406, 69622, Lyon, France. 4. LIBM-EA 7424, Interuniversity Laboratory of Biology of Mobility, Claude Bernard Lyon 1 University, Lyon, France.
Abstract
PURPOSE: Many surgeons are performing total knee arthroplasty (TKA) with an aim to reproducing native anatomical coronal alignment. Yet, it remains unclear if primary osteoarthritic and non-osteoarthritic populations have similar knee coronal alignment. This study aims to describe and compare the distribution of femoral and tibial coronal alignment in a large primary osteoarthritic cohort and a young non-osteoarthritic cohort. METHODS: This is a retrospective analysis of a monocentric prospectively gathered data, from 1990 to 2019, of 2859 consecutive primary osteoarthritic knees in 2279 patients. Patients underwent standardized long-leg radiographs. Femoral mechanical angle (FMA) and tibial mechanical angle (TMA) were digitally measured using software. Femoral, tibial and knee phenotypes were analyzed, and descriptive data were reported. Data were compared to a young non-osteoarthritic population previously described. RESULTS: In osteoarthritic knees, the mean FMA was 91° ± 2.9° (range 86°-100°) and the mean TMA was 87° ± 3.1° (range 80°-94°). No significant difference was observed for FMA and TMA between genders. The most common femoral and tibial phenotypes were varus (38.7%) and neutral (37.1%). The most frequent knee phenotype was a varus femoral phenotype with a neutral tibial phenotype (15.5%), which is different to the non-osteoarthritic population. CONCLUSION: This study showed the wide distribution of knee phenotypes in a large osteoarthritic cohort. There was more varus distribution of the femoral coronal alignment compared to a non-osteoarthritic population, suggesting consideration and potential adaptation of the realignment strategy of the femoral component during TKA. LEVEL OF EVIDENCE: III.
PURPOSE: Many surgeons are performing total knee arthroplasty (TKA) with an aim to reproducing native anatomical coronal alignment. Yet, it remains unclear if primary osteoarthritic and non-osteoarthritic populations have similar knee coronal alignment. This study aims to describe and compare the distribution of femoral and tibial coronal alignment in a large primary osteoarthritic cohort and a young non-osteoarthritic cohort. METHODS: This is a retrospective analysis of a monocentric prospectively gathered data, from 1990 to 2019, of 2859 consecutive primary osteoarthritic knees in 2279 patients. Patients underwent standardized long-leg radiographs. Femoral mechanical angle (FMA) and tibial mechanical angle (TMA) were digitally measured using software. Femoral, tibial and knee phenotypes were analyzed, and descriptive data were reported. Data were compared to a young non-osteoarthritic population previously described. RESULTS: In osteoarthritic knees, the mean FMA was 91° ± 2.9° (range 86°-100°) and the mean TMA was 87° ± 3.1° (range 80°-94°). No significant difference was observed for FMA and TMA between genders. The most common femoral and tibial phenotypes were varus (38.7%) and neutral (37.1%). The most frequent knee phenotype was a varus femoral phenotype with a neutral tibial phenotype (15.5%), which is different to the non-osteoarthritic population. CONCLUSION: This study showed the wide distribution of knee phenotypes in a large osteoarthritic cohort. There was more varus distribution of the femoral coronal alignment compared to a non-osteoarthritic population, suggesting consideration and potential adaptation of the realignment strategy of the femoral component during TKA. LEVEL OF EVIDENCE: III.
Authors: Michael T Hirschmann; Silvan Hess; Henrik Behrend; Felix Amsler; Vincent Leclercq; Lukas B Moser Journal: Knee Surg Sports Traumatol Arthrosc Date: 2019-04-09 Impact factor: 4.342
Authors: Michael T Hirschmann; Lukas B Moser; Felix Amsler; Henrik Behrend; Vincent Leclercq; Silvan Hess Journal: Knee Surg Sports Traumatol Arthrosc Date: 2019-04-12 Impact factor: 4.342
Authors: Silvan Hess; Lukas B Moser; Felix Amsler; Henrik Behrend; Michael T Hirschmann Journal: Knee Surg Sports Traumatol Arthrosc Date: 2019-04-15 Impact factor: 4.342
Authors: Michael T Hirschmann; Lukas B Moser; Felix Amsler; Henrik Behrend; Vincent Leclerq; Silvan Hess Journal: Knee Surg Sports Traumatol Arthrosc Date: 2019-04-11 Impact factor: 4.342