Department of Hand Surgery, Hand Surgery Research Center, Affiliated Hospital of Nantong University, College of Medicine, University of Nantong, 20 West Temple Road, Nantong, 226001, Jiangsu, China.
Department of Orthopedic Surgery, ASAN Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.
Surg Radiol Anat. 2020 Aug;42(8):919-925. doi: 10.1007/s00276-020-02451-5. Epub 2020 Mar 14.
This study investigated the length changes of the anterior bundle of the medial collateral ligament (AMCL) and the lateral ulnar collateral ligament (LUCL) in forearm pronation and supination under axial load in vivo.
Six healthy volunteers (2 males and 4 females, the average age of 44.6 years) were included in the study. CT scan of elbow joints was obtained at positions of forearm pronation and supination before and after load with the elbow extension. Mimics, Geomagic Studio, 3-matic Medical and Geometry Sketchpad were used to reconstruct three-dimensional models and analyze length changes of AMCL and LUCL. The AMCL and LUCL were divided, respectively, to three parts: the medial part, the middle part and the lateral part.
Our results showed the length of the medial and middle parts of the AMCL significantly decreased from pronation to supination without load (0.46 mm, P < 0.05 and 0.43 mm, P < 0.05). With load, the length of the medial part and the middle of the AMCL significantly decreased from pronation to supination (0.62 mm, P < 0.05 and 0.44 mm P < 0.05). However, the length of the LUCL almost remained static for the forearm pronation and supination regardless of the axial load.
The results showed that tension of the AMCL increases in forearm pronation, and increased tension on the ligament during impact may pave the way to injury. The AMCL of elbow may be easier to be injured in forearm pronation.
本研究旨在体内轴向负荷下研究前臂旋前和旋后时内侧副韧带前束（AMCL）和外侧尺侧副韧带（LUCL）的长度变化。
本研究纳入了 6 名健康志愿者（2 名男性和 4 名女性，平均年龄 44.6 岁）。在伸展肘部的情况下，分别于前臂旋前和旋后位进行肘部 CT 扫描。使用 Mimics、Geomagic Studio、3-matic Medical 和 Geometry Sketchpad 重建三维模型并分析 AMCL 和 LUCL 的长度变化。将 AMCL 和 LUCL 分别分为三个部分：内侧部分、中间部分和外侧部分。
我们的结果显示，在无负荷的情况下，从旋前到旋后，AMCL 的内侧和中间部分的长度明显缩短（0.46mm，P<0.05 和 0.43mm，P<0.05）。在有负荷的情况下，从旋前到旋后，AMCL 的内侧部分和中间部分的长度明显缩短（0.62mm，P<0.05 和 0.44mm，P<0.05）。然而，无论轴向负荷如何，LUCL 的长度在前臂旋前和旋后几乎保持不变。
结果表明，AMCL 在前臂旋前时张力增加，在冲击时增加的韧带张力可能导致损伤。因此，肘关节的 AMCL 在旋前时更容易受伤。
