Sun Y C, Sheng X M, Chen J, Qian Z W
Department of Hand Surgery, Affiliated Hospital of Nantong University, Nantong, Nantong University, Jiangsu, China.
J Hand Surg Eur Vol. 2017 Jul;42(6):610-615. doi: 10.1177/1753193417692708. Epub 2017 Feb 17.
We investigated the in vivo length changes of the collateral ligaments of metacarpophalangeal joint during flexion. We obtained computed tomography scans of index, middle, ring and little fingers at 0°, 30°, 60° and 90° of joint flexion from six hands of six healthy adult volunteers. Three of them had their dominant right hand studied, and the other three had their non-dominant left hand studied. We measured and analysed the radial and ulnar collateral ligaments of each metacarpophalangeal joint from the reconstructed images. We found that the dorsal and middle portions of the both radial and ulnar collateral ligament lengthened progressively during digital flexion and reached the maximum at 90° flexion. The length of the volar portion increased from 0° to 30° flexion and then decreased from 30° to 60° flexion, reaching the minimum at 90°. In conclusion, three portions of collateral ligaments on both sides of the metacarpophalangeal joint have variable length changes during flexion, which act to stabilize the joint through its flexion arc.
我们研究了掌指关节侧副韧带在屈曲过程中的体内长度变化。我们从6名健康成年志愿者的6只手中获取了在关节屈曲0°、30°、60°和90°时示指、中指、环指和小指的计算机断层扫描图像。其中3人研究其优势右手，另外3人研究其非优势左手。我们从重建图像中测量并分析了每个掌指关节的桡侧和尺侧副韧带。我们发现，在手指屈曲过程中，桡侧和尺侧副韧带的背侧和中间部分逐渐延长，并在屈曲90°时达到最大值。掌侧部分的长度在屈曲0°至30°时增加，然后在屈曲30°至60°时减少，在屈曲90°时达到最小值。总之，掌指关节两侧的三部分侧副韧带在屈曲过程中具有不同的长度变化，通过其屈曲弧度起到稳定关节的作用。
