A mouse model of ankle-subtalar joint complex instability induced post-traumatic osteoarthritis

Journal of Orthopaedic Surgery and Research

Peixin Liu¹  Jia Yu¹  Kaiwen Chen¹  Chunzhuo Hua¹  Hongtao Zhang¹  Shuo Wang¹ 

[1] Department of Orthopedics, The First Affiliated Hospital of Soochow University, 899 Pinghai Road, 215006, Suzhou, Jiangsu, People’s Republic of China;Orthopedic Institute, Soochow University, 178 Ganjiangdong Rd, 215006, Suzhou, Jiangsu, People’s Republic of China;

关键词: Ankle instability;    Subtalar instability;    Cervical ligament;    Gait;    Biomechanics;   

DOI  :  10.1186/s13018-021-02683-0

来源: Springer

【 摘 要 】

BackgroundAnkle-subtalar joint complex instability is not uncommonly presented in the clinic, but symptoms and signs similar to other conditions can easily lead to its misdiagnosis. Due to the lack of appropriate animal models, research on ankle-subtalar joint complex instability is limited. The aims of the present study were to establish an animal model of ankle-subtalar joint complex instability in mice and to explore its relationship with post-traumatic osteoarthritis (PTOA).MethodsTwenty-one male C57BL/6J mice were randomly divided into three groups: SHAM group (sham surgery group), transected cervical ligament + anterior talofibular ligament (CL+ATFL) group, and transected cervical ligament + deltoid ligament (CL+DL) group. Two weeks after surgery, all mice underwent cage running training. Balance beam and gait tests were used to evaluate the changes in self-movement in the mice after ankle-subtalar ligament injury. Micro-CT and histological staining were used to evaluate the progress of PTOA.ResultsCompared with the SHAM group, balance and gait were affected in the ligament transection group. Twelve weeks after surgery, the time required to cross the balance beam in the CL+ATFL group was 35.1% longer and the mice slipped 3.6-fold more often than before surgery, and the mean step length on the right side was 7.2% smaller than that in the SHAM group. The time required to cross the balance beam in the CL+DL group was 32.1% longer and the mice slipped 3-fold more often than prior to surgery, and the average step length on the right side was 5.6% smaller than that in the SHAM group. CT images indicated that 28.6% of the mice in the CL+DL group displayed dislocation of the talus. Tissue staining suggested that articular cartilage degeneration occurred in mice with ligament transection 12 weeks after surgery.ConclusionsTransected mice in the CL+ATFL and CL+DL groups displayed mechanical instability of the ankle-subtalar joint complex, and some mice in the CL+DL group also suffered from talus dislocation due to ligament injury leading to loss of stability of the bone structure. In addition, as time progressed, the articular cartilage displayed degenerative changes, which affected the ability of animals to move normally.

【 授权许可】

CC BY