The congruence angle is a measurement of the 'fit' of the kneecap (patella) into the underlying groove or 'trochlea' of the thighbone (femur).


X-ray measurement

The congruence angle is one of the indices calculated by surgeons and radiologists when assessing the patella both before and after surgical procedures which attempt to re-align it.


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Radiologic Assessment of Patellofemoral Pain in the Athlete. Endo Y, Shubin Stein BE and Potter HG. Sports Health. 2011 Mar; 3(2): 195–210.

Contemporary femoral designs in total knee arthroplasty: effects on the patello-femoral congruence. Indelli PF, Marcucci M, Cariello D, Poli P and Innocenti M. Int Orthop. 2012 Jun; 36(6): 1167–1173.

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