The biomechanical role of the lacertus fibrosus of the biceps brachii Muscle

xlomafota13 shared this article with you from Inoreader The biomechanical role of the lacertus fibrosus of the biceps brachii Muscle Via radiol anat Surg Radiol Anat. 2021 Mar 22. doi: 10.1007/s00276-021-02739-0. Online ahead of print. ABSTRACT PURPOSE: The lacertus fibrosus (LF) is involved in various surgeries. However, the biomechanical contribution of the LF remains unclear. The aim of this study was to determine the role of the lacertus fibrosus on the elbow and forearm kinematics and on the biceps brachii muscle lever arms. METHODS: This biomechanical study was performed on seven fresh-frozen upper limbs of c adavers. Elbow flexion, forearm supination, and biceps brachii muscle lever arms were analyzed in the intact conditions (I) and after superficial (R) and deep part (R2) of the lacertus fibrosus release, respectively. RESULTS: Elbow flexion shows a significant difference (p < 0.0001) between I, R, R2. Abduction/adduction shows a significant difference between I-R (p < 0.0001) and I-R2 (p < 0.0001). Supination does not show a significant difference in mean maximum amplitude, but between 40 and 70%, there are significant differences. There is a significant mean decrease of lever arm in flexion (28%) and supination (50%) after superficial and deep part of the lacertus fibrosus release. CONCLUSION: The results of this study show that the lacertus fibrosus increases the lever arm during flexion and supination. It limits the flexion and abduction of the elbow and supination of the forearm. Lacertus fibrosus maintains the rhythmicity between the elbow flexion and supina tion of the forearm. LEVEL OF EVIDENCE: Basic science study, biomechanics. PMID:33751178 | DOI:10.1007/s00276-021-02739-0 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.