Acetabular dysplasia, characterized by a shallow acetabulum and decreased coverage of the femoral head (Figure 1), is thought to cause early osteoarthritis due to altered mechanical loading. Clinical observation of hypertrophic labra in dysplastic hips suggests that the labrum supports mechanical load (e.g., [1]). Simulations have predicted increased cartilage contact pressure and decreased contact area in dysplastic hips as potential causes of early osteoarthritis (e.g., [2]), but have been limited by the use of simplified geometry and the omission of the labrum. The objective of this study was to compare labrum and cartilage mechanics between normal and dysplastic hips using a validated approach to subject-specific finite element modeling of the hip.

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