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- Title
Deformity analysis of the lower limb on the coronal plane in patients with rheumatoid arthritis and osteoarthritis.
- Authors
Shuntaro Nejima; Hiroshi Fujimaki; Ken Kumagai; Hyonmin Choe; Hiroyuki Ike; Taro Tezuka; Kensuke Hisatomi; Akiko Nagaoka; Yutaka Inaba
- Abstract
Objectives: To evaluate joint orientation angles of the coronal plane in patients with rheumatoid arthritis (RA) in comparison with osteoarthritis (OA). Methods: In total, 72 patients with RA (90 knees) and 76 patients with OA (90 knees) who underwent total knee arthroplasty were enrolled. The hip-knee-ankle (HKA) angle, mechanical lateral distal femoral angle (mLDFA), mechanical medial proximal tibial angle (mMPTA), and joint line convergence angle (JLCA) were measured on preoperative long-leg radiographs in the standing position. Student's t-test was used to assess differences in radiographic data between patients with RA and OA. Results: In knees with RA and OA, the mean HKA was -3.4 ± 9.4° and -10.6 ± 8.0°, the mean mLDFA was 86.6 ± 3.7° and 88.2 ± 2.7°, the mean mMPTA was 85.9 ± 4.0° and 84.3 ± 3.7°, and the mean JLCA was 2.7 ± 4.2° and 6.8 ± 4.1°. All parameters in the knees with RA were more valgus than those with OA. Conclusions: Knees with RA had a great variability in joint orientation angles on the coronal plane; the whole lower limb alignment and the femur, tibia, and joint were more valgus in knees with RA than with OA.
- Subjects
RHEUMATOID arthritis; ANATOMICAL planes; OSTEOARTHRITIS; HUMAN abnormalities; TOTAL knee replacement
- Publication
Modern Rheumatology, 2022, Vol 32, Issue 4, p741
- ISSN
1439-7595
- Publication type
Article
- DOI
10.1093/mr/roab046