Trochlear Inclination Angles in Normal and Dysplastic Knees |
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| Authors: | Atul F Kamath Thomas R Slattery Ashley E Levack Chia H Wu J Bruce Kneeland Jess H Lonner |
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| Institution: | ? Department of Orthopaedic Surgery, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania;† Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania;‡ Department of Orthopaedic Surgery, Rothman Institute, Thomas Jefferson University, Philadelphia, Pennsylvania |
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| Abstract: | Trochlear morphology impacts component position in patellofemoral arthroplasty. We devised a measurement of the trochlear inclination angle (TIA) and determined the average TIA in normal and dysplastic knees. Three hundred twenty-nine consecutive magnetic resonance imagings of normal and dysplastic knees were evaluated. The TIA was measured by 2 reviewers. The Student t test was used, and intraobserver reliability measurements were made. The mean TIA in normal and dysplastic knees was internally rotated 11.4° (range, 6°-20°) and 9.4° (range, 4°-15°), respectively. The mean TIA did not differ significantly by sex or age. Trochlear inclination angles in both normal and dysplastic knees tend toward internal rotation. Positioning a trochlear patellofemoral arthroplasty component flush with the articular surface of the native trochlea would result in internal rotation malposition. |
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| Keywords: | trochlear inclination angle patellofemoral knee arthroplasty (replacement) maltracking patellofemoral arthroplasty |
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