"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). "
[Show abstract][Hide abstract] ABSTRACT: The geometry of acetabular cartilage surface plays an important role in hip joint biomechanics. The aim of this study was to analyze the morphology of acetabular articular cartilage surface in elderly donated bodies to science using a 3D-digitizer.
Twenty hemipelves from 12 subjects (mean ages 85 years) were scanned with 3D-digitizer. Each acetabular surface model was divided into four regions: anterosuperior (AS), anteroinferior (AI), posterosuperior (PS), and posteroinferior (PI). In the global acetabulum and each region, the acetabular sphere radius and the standard deviation (SD) of the distance from the acetabular sphere center to the acetabular cartilage surface were calculated. In the global acetabulum, the distance between the acetabular surface model and the maximum sphere which did not penetrate over the acetabular surface model was calculated as the inferred femoral head, and then the distribution was mapped at intervals of 0.5 mm.
The SD in AS was significantly larger than that in AI (p = 0.006) and PI (p = 0.001). The SD in PS was significantly larger than that in PI (p = 0.005). The closest region (0-0.5 mm) tended to be distributed at anterior or posterosuperior acetabular edge.
The contact between the femoral head and acetabulum might start at the periphery of the lunate surface, especially in the anterior or posterosuperior region. From viewpoint of acetabular morphology, the acetabular articular cartilage in the anterior or posterosuperior edge could be more vulnerable due to direct contact mechanism.
Surgical and Radiologic Anatomy 01/2015; DOI:10.1007/s00276-015-1427-6 · 1.05 Impact Factor
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