Study on tibial plateau tilting angle in osteoarosis of the knee.

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Despite of the alteration of the tibial plateau inclination, reports of the high tibial osteotomy rarely has mentioned about it. The purpose of this investigation was to evaluate the relationship of clinical effect and the tibial plateau tilting angle after the corrective osteotomy for osteoarthrosis of the knee with valgus deformity. Tibial plateau tilting angle to tibial axis (T. P. A-A) and to floor (T. P. A-F) were measured on standing antero-posterior roentgeno-grams pre-operatively and post-operatively.1) In the virus type, T. P. A-A was closely related with the femoro-tibial angle (F. T. A.), but T. P. A-F was not almost.2) In the valugus type, T. P. A-A was almost within normal range.3) In good cases of clinical results, T. P. A-A was +3.5±0.95 degrees. In the fair and poor cases T. P. A-A was -3.15±2.95 degrees.These results indicate that when the determination of the amount of angular correction for osteotomy is made, an adequate T. P. A-A is about +3 degrees.
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