Hip Stability after Total Hip Arthroplasty: Quantifying Capsule and Passive Muscle Contributions
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Description:
Dislocation remains a leading cause of revision following total hip arthroplasty, particularly during passive or less weight-bearing movements. This study developed and calibrated a computational model incorporating the hip capsule and local muscles against cadaveric measurements to quantify their contributions to passive rotational stability. Muscles contributed 69.0% of overall resistive torque, while the capsule contributed 31.0%. The iliofemoral and ischiofemoral ligaments, gluteus medius, and quadratus femoris were identified as key passive stabilizers. The model was also used to evaluate the effects of stem alignment on hip laxity and dislocation resistance.