The Knee Learning Resource
It is of value in determining whether or not there is patella alta. 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) compared to (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.
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