In vivo fluoroscopic analysis of fixed-bearing total knee replacements

Clinical Orthopaedics and Related Research
Douglas A DennisMohamed R Mahfouz

Abstract

In vivo kinematic patterns were determined for subjects (patients participating in the study), having either a fixed-bearing posterior-stabilized or posterior cruciate-retaining total knee arthroplasty. While under fluoroscopic surveillance, subjects did normal gait and a deep knee bend. Video images were downloaded to a workstation computer and analyzed in three dimensions using an iterative model-fitting approach. Femorotibial contact paths for the medial and lateral condyles, axial rotation, and condylar lift-off were determined. During a deep knee bend, subjects having a posterior-stabilized total knee arthroplasty routinely experienced posterior femoral rollback of their lateral condyle and normal axial rotational patterns, whereas random subjects having a posterior cruciate-retaining total knee arthroplasty experienced paradoxical anterior sliding and opposite axial rotational patterns. During gait, posterior-stabilized and posterior cruciate-retaining total knee arthroplasties experienced similar kinematic patterns, with the presence of paradoxical sliding and opposite axial rotational patterns. Subjects having posterior-stabilized and posterior cruciate-retaining total knee arthroplasties experienced condylar lift-off. ...Continue Reading

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Citations

Mar 24, 2009·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Christoph BecherCarsten O Tibesku
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