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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Dr Sheila Strover (Editor)
BSc (Hons), MB BCh, MBA

See biography...