Caton-Deschamps Index and patella alta
The index is of value in determining whether or not there is patella alta (high riding kneeap). It is a ratio of the distance between:
- the lower point of the part of the patella that makes contact with the femur to the top of the tibial plateau
- the length of the part of the back of the patella that makes contact with the femur
The normal range is 0.8-1.2. A ratio higher than 1.3 is suggestive of patella alta.
Evaluation of patella alta using MRI measurements in adolescents. Yılmaz B, Ozdemir G, Sirin E, Cicek ED, Anıl BS and Bulbun G. Indian J Radiol Imaging. 2017 Apr-Jun; 27(2): 181–186.
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