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  • Title: An in vivo model for intraoperative assessment of impingement and dislocation in total hip arthroplasty.
    Author: Tanino H, Ito H, Harman MK, Matsuno T, Hodge WA, Banks SA.
    Journal: J Arthroplasty; 2008 Aug; 23(5):714-20. PubMed ID: 18534546.
    Abstract:
    We have developed an intraoperative model to quantify total hip arthroplasty impingement and dislocation mechanics using fluoroscopy and shape-matching techniques. Two patient groups were investigated: group 1 consisted of 12 hips using 28- or 32-mm femoral heads and an anterolateral surgical approach, and group 2 consisted of 17 hips using 22- or 26-mm femoral heads and a posterolateral surgical approach. During intraoperative hip stability testing consisting of extension and external rotation motions, group 1 was more unstable, and prosthetic impingement was the major reason for dislocation. With flexion and internal rotation motions, group 2 was more unstable, and superior-lateral impingement or soft tissue traction was the major reason for dislocation. Intraoperative quantitative assessment of hip mechanics provides a safe and clinically relevant method to characterize potential complications and evolve techniques to prevent them.
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