There were 52 cases (98 knees) with lateral patellofemoral arthritis,47 cases (94 knees) with patella alta and 5 cases (8 knees) with insufficient of vastus medialis obliques muscle function.

• 高位髌骨 4 7例 94膝 ; 外伤后股四头肌内侧头肌张力不良 5例 8膝。