Trochlear Inclination Angles in Normal and Dysplastic Knees

Atul F. Kamath, Thomas R. Slattery, Ashley E. Levack, Chia H. Wu, J. Bruce Kneeland, Jess H. Lonner

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)214-219
Number of pages6
JournalJournal of Arthroplasty
Issue number2
StatePublished - Feb 2013


  • Knee arthroplasty (replacement)
  • Maltracking, patellofemoral arthroplasty
  • Patellofemoral
  • Trochlear inclination angle

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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