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- Title
Increased femoral antetorsion correlates with higher degrees of lateral retropatellar cartilage degeneration, further accentuated in genu valgum.
- Authors
Flury, A.; Hoch, A.; Andronic, O.; Fritz, B.; Imhoff, F. B.; Fucentese, S. F.
- Abstract
<bold>Purpose: </bold>The role of increased femoral antetorsion (femAT) as a contributor to patellofemoral (PF) osteoarthritis (OA) is unknown. The purpose of this study was to investigate whether increased femAT was associated with advanced cartilage degeneration in the lateral PF joint.<bold>Methods: </bold>Patients who underwent complete radiographic workup for surgical intervention due to OA in any knee joint compartment were included. Cartilage morphology according to the International Cartilage Repair Society (ICRS) cartilage lesion classification system in the PF joint, femoral and tibial torsion, frontal leg axis, and tibial tuberosity-trochlear groove (TT-TG) distance were assessed. Increased femAT was defined as > 20° according to previous reports.<bold>Results: </bold>A total of 144 patients were included. Ninety-seven patients had a femAT of < 20° and 45 of > 20°. A significant odds ratio (OR) was found for lateral retropatellar (OR 3.5; p = 0.02) ICRS grade 3 and 4 cartilage degeneration and increased femAT ≥ 20°. In the medial PF compartment, increased femAT had an inverse effect (OR 0.16; p = 0.01). No significant ORs were found for TT-TG distance, tibial torsion, or leg axis. The lateral retropatellar ICRS grade showed a linear correlation to increased femAT values. In valgus knees, isolated lateral PF OA had an even more pronounced correlation to increased femAT (p = 0.004).<bold>Conclusion: </bold>Increased femAT showed higher grades of lateral retropatellar cartilage degeneration, which was even more pronounced in valgus knees.<bold>Level Of Evidence: </bold>Cohort study: Level III.
- Subjects
FEMUR diseases; FEMUR injuries; PATELLOFEMORAL joint diseases; OSTEOARTHRITIS; DISEASE risk factors; CARTILAGE diseases; DEGENERATION (Pathology); TORSION Miocardica Investigacion Anatomo Funcionalb (Book); KNEE diseases; BONE diseases; CARTILAGE; FEMUR; ODDS ratio; LOGISTIC regression analysis; TIBIA; KNEE; LONGITUDINAL method
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2021, Vol 29, Issue 6, p1760
- ISSN
0942-2056
- Publication type
journal article
- DOI
10.1007/s00167-020-06223-x