In vivo hip joint contact distribution and bony impingement in normal and dysplastic human hips

Department of Orthopaedic Surgery, Osaka Kosei Nenkin Hospital, 4-2-78, Fukushima, Fukushima-ku, Osaka, 553-0003, Japan.
Journal of Orthopaedic Research (Impact Factor: 2.99). 10/2013; 31(10). DOI: 10.1002/jor.22414
Source: PubMed


Our objectives were to clarify the 3D articular contact areas of the in vivo normal hip joint and acetabular dysplasia during specific positions using magnetic resonance imaging (MRI), voxel-based registration, and proximity mapping. Forty-two normal and 24 dysplastic hips were examined. MRI was performed at four positions: neutral; 45° flexion; 15° extension; and the Patrick position. Femur and pelvis bone models were reconstructed at the neutral position and superimposed over the images of each different position using voxel-based registration. The inferred cartilage contact and bony impingement were investigated using proximity mapping. The femoral head translated in the anterior or posteroinferior, anterosuperior, and posteroinferior direction from neutral to 45° flexion, 15° extension, and the Patrick position, respectively. Multiple regression analyses showed age, femoral head sphericity, and acetabular sphericity to be associated with higher hip instability. The present technique using subject-specific models revealed the in vivo hip joint contact area in a population of healthy individuals and dysplastic patients without radioactive exposure. These results can be used for analyzing disease progression in the dysplastic hip and pathogenesis of acetabular labral tear. © 2013 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res XX:XXX-XXX, 2013.

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    • "Further, our results support clinical observations of OA progression for relatively young patients with acetabular dysplasia versus older patients. In patients with traditional dysplasia and early OA, labral tears and peripheral damage to the acetabular cartilage and delamination are the most common findings (Akiyama et al., 2013; Dorrell and Catterall, 1986; Fujii et al., 2009; Hartig-Andreasen et al., 2013; McCarthy et al., 2003, 2001a, 2001b; Tamura et al., 2012; Thomas et al., 2013). In contrast, older patients with early OA typically exhibit progressive joint space narrowing (Conrozier et al., 1998; Franklin et al., 2011; Goker et al., 2000). "
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