Abstract

This study is to explore the influence of palmar lateral joint capsule ligament complex on dorsal stretching stability of wrist lateral joint and to analyze its biomechanical principle, so as to provide reference for clinical medicine. To study the biomechanical characteristics of palmar lateral joint capsule posterior ligament complex, in this study we selected 8 freshly donated body upper limbs including 5 left ones and 3 right ones as research objects. By cutting off forearms and hand soft tissues and leaving wrist lateral joint capsule ligaments, the complex model was made, which can be used as normal sample. Extending from styloid process of radius to styloid process of ulna, we operated on distal ulna and cut off palmar lateral joint capsule ligament complex along an arc line and regarded it as a damaged sample. Through simulating actual clinical operation, the sample was repaired using an external fixation and analyzed according to wrist joint displacement load values. Results showed that regarding the same sample, the comparison of different displacement points was of statistical significance. In all, palmar wrist lateral joint capsule ligament complex is of vital importance, which is a key structure that determines the stability of wrist joint. Once the complex is injured, it will cause extremely serious consequences in which the most significant one is the wrist joint instability. In clinical practice, it cannot achieve very satisfactory effect by only repairing palmar lateral joint capsule ligament complex. By only relying on a transarticular external fixator, the complex can be successfully repaired and thus the complex injury displacement can be avoided and wrist joint stability be secured.