Abstract
One reason of the chondromalacia patellae is the functional incongruence due to a patellofemoral dysplasia like for example the so called hunter's hat deformity. As a curative treatment in those cases an osteotomy of the patella may be carried out. This operation shall improve the congruence of the articular surface as well as the stability of the patella. There are experimental studies describing the femoropatellar pressure situation in eight cases with a surgical induced hunter's hat patella after osteotomy. The results represent a significant increase of the opposing surfaces in the medial compartment and a more uniform distribution of the femoropatellar pressure.
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