Patella Baja after Displacement of Tibial Tuberosity for Patello-femoral Disorders.

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The change of patellar height after displacement of tibial tuberosity and its effect on the improvement of clinical signs of knees were studied.<BR>Anterior or antero -medial displacement of tibial tuberosity was done on 36 knees (anterior displacement 14 and antero-medical displacement, 20) with patello-femoral arthrosis of 29 patients (4 men and 25 women, with ages at operation ranging from 47 to 79, averaging 58.3), and antero -medial or medial displacement of tibial tuberosity was done on 25 knees (antero-medial displacement, 10 and medial displacement, 15) with patellofemoral disorders (recurrent patellar dislocation, 11 and patellar subluxation, 14) of 24 patients (2 men and 22 women, aged from 14 to 37, averaging 22.4) . Patellar height was measured from the lateral view by Insall-Salvati's method using the ligament/patella ratio. The ligament/patella ratio of the older (arthrosis) group was decreased significantly (p<0.01) after operation, from 1.10 to 0.94. The ratio of the younger (patellar dislocation) group showed no significant changes, but that of 7 knees with a high patella (more than 1.2 on the ligament/patella ratio before operation) decreased significantly (p<0.001), from 1.47 to 1.31. The postoperative patella baja had no poor effects on the improvement of clinical signs.
日本関節病学会の論文