Features of Structural and Functional Disorders in Patellar Instability Associated with Femoral Condyle Dysplasia (Clinical and Experimental Study)

O.А. Buryanov, M.G. Kryshchuk, O.A. Kostogryz, V.V. Lykhodiy, V.O. Yeshchenko, M.O. Zadnichenko


The Aim. To investigate the features of structural and functional disorders of patellar instability associated with femoral condyle dysplasia type A and B.
Materials and Methods. Arthroscopically we examined 98 patients with patellar instability associated with femoral condyle dysplasia. With type A dysplasia — 65 (66.3 %) patients, type B — 33 (33.7 %) patients. Dynamic computer simulation models were developed to determine the characteristics of the distribution of stress in the patellar cartilage.
Results. More severe degree of patellar cartilage injury was marked in instability with type B dysplasia (p < 0.05). The severity of patellar cartilage injury depends on the duration of the disease (p < 0.05). In patellar instability with type B dysplasia, greater tension is detected in patellar cartilage at 10° knee flexion by 126 %, at 20° — by 120 %, at 30° — by 123 %, than in patellar instability with type A dysplasia, when tensions in patellar cartilage at 10° knee flexion increased only by 116 %, at 20° — by 105 %, and at 30° decreased by 16 %.
Conclusions. Patellar instability with type B dysplasia is characterized by more severe patellar cartilage injuries compared with type A dysplasia. The severity of cartilage damage is caused by higher tension in the cartilage in femoral condyle dysplasia.


patellar instability; trochlea dysplasia; cartilage injury


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