Department of Orthopaedics, the Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-chou, Kawaramachi-Hirokoji, Kyoto, Japan.
Knee Surg Sports Traumatol Arthrosc. 2010 Nov;18(11):1470-5. doi: 10.1007/s00167-010-1043-2. Epub 2010 Jan 30.
Recently, for a recurrent patellar dislocation, medial patellofemoral ligament (MPFL) reconstruction has come to be commonly performed, yet the precise in vivo MPFL biomechanics still remains to be clarified. The purpose of this study was to analyze the length change pattern of MPFL in vivo. The subjects were comprised of ten male and ten female healthy volunteers. The length of the MPFL was measured using an open-MRI both from a leg extended position and a highly knee-flexed position in order to analyze the length change pattern of the MPFL. The MPFL length for men and women resulted in an average of 52 ± 3 mm and 43 ± 2 mm at the knee extended position, respectively. The length change pattern of the MPFL presented a slight change at up to a flexion angle of 60° and a decrease at over 60°. In terms of morphology, the fiber bundle of the MPFL experienced linear tension at a knee flexion angle of 60°. We determined that the MPFL length in vivo exhibited a specific length change pattern. MPFL mainly contributes to the medial constraint of a patella with a knee flexion of 0° to 60°, wherein it is expected to have the strongest strain at 60°. However, more studies are needed to obtain a better understanding of cases with a history of patellar dislocation.
最近，对于复发性髌骨脱位，内侧髌股韧带（MPFL）重建已被广泛应用，但 MPFL 的精确的体内生物力学特性仍有待阐明。本研究旨在分析 MPFL 在体内的长度变化模式。研究对象包括 10 名男性和 10 名女性健康志愿者。使用开放式 MRI 分别从膝关节伸直位和高度屈膝位测量 MPFL 的长度，以分析 MPFL 的长度变化模式。男性和女性的 MPFL 长度在膝关节伸直位时平均为 52 ± 3mm 和 43 ± 2mm。MPFL 的长度变化模式在 60°以内的弯曲角度下略有变化，超过 60°时则会减小。从形态学上看，MPFL 的纤维束在膝关节弯曲 60°时会经历线性张力。我们确定 MPFL 在体内的长度表现出特定的长度变化模式。MPFL 主要在膝关节 0°至 60°的弯曲范围内对髌骨的内侧进行约束，在 60°时预计会有最强的应变。然而，需要更多的研究来更好地理解有髌骨脱位病史的病例。
