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Title: Medial and lateral osteoarthritis of the knee is related to variations of hip and pelvic anatomy
Author(s): Weidow J, Mars I, Karrholm J
Source: OSTEOARTHRITIS AND CARTILAGE 13 (6): 471-477 JUN 2005
Document Type: Article
Language: English
Cited References: 26      Times Cited: 1
Abstract: Objective: We evaluated if increased risk of combined hip and lateral knee osteoarthritis (OA) could be attributed to anatomical reasons in the hip region resulting in increased abductor moment over the knee.

Methods: We measured pelvic width, femoral offset, femoral neck length and angle in 29 women with lateral knee OA (13 unilateral, 16 bilateral) and 27 women with bilateral media[ OA. Twenty-one of these patients with normal hips (lateral/medial OA of the knee = 12/9) and 35 with associated hip OA (lateral/medial OA of the knee = 17/18) were evaluated separately. Radiographic examinations in 14 women planned for hip prosthesis because of failures after hip fracture acted as controls.

Results: Patients with lateral OA of the knee had wider pelvis than controls (13.7 mm increased distance between the medial borders of the acetabulum, P = 0.001). Patients with medial OA had 11.4 mm longer distance from the centre of the femoral head to the centre of the proximal part of the femoral shaft (P = 0.005), corresponding to a higher offset. The pelvic and hip anatomy also differed between patients with medial and lateral OA of the knee. In the groups without hip OA, presence of lateral knee OA was associated with a wider pelvis (P = 0.009), shorter femoral neck (P 0.02) and Head-Shaft distance (P = 0.04). In the groups with OA of the hip associated lateral OA of the knee also implied increased Neck Shaft angle (coxa valga, P = 0.008), but there was no difference in pelvic width (P = 0.15). We found a shorter lever arm over the hip in lateral knee OA compared to medial knee OA (P = 0.02), but not when compared to controls.

Conclusion: Our findings suggest that occurrence of medial or lateral OA has a biomechanical background originating from pelvis and hip anatomy. (C) 2005 OsteoArthritis Research Society International. Published by Elsevier Ltd. All rights reserved.

Addresses: Weidow J (reprint author), Sahlgren Univ Hosp, Dept Orthopaed, S-41345 Gothenburg, Sweden
Sahlgren Univ Hosp, Dept Orthopaed, S-41345 Gothenburg, Sweden
Cent Hosp Halmstad, Dept Radiol, S-30185 Halmstad, Sweden
Subject Category: Orthopedics; Rheumatology
IDS Number: 935NZ
ISSN: 1063-4584