Patellofemoral problems related to soft-tissue imbalance, implant malposition, and extensor mechanism malalignment generally become clinically evident within months of surgery.

• 涉及到软组织平衡，植入物位置不正和伸肌机制排列不正的髌骨股骨问题通过数月的手术通常在临床上是显而易见。