In the second case released today, Gregory v. ICBC, the Plaintiff wished to put an expert report into evidence that gave an opinion based on the assumption that «there has been a partial tear of (the Plaintiff's) subscapularis tendon.» (bc-injury-law.com)
While the anterior deltoid has only the fourth largest peak moment arm length during shoulder flexion, the clavicular pectoralis major and posterior and anterior subscapularis have maximum moment arms lengths at moderate (71 degrees) and small (2.5 degrees) shoulder positions respectively. (strengthandconditioningresearch.com)
These muscles are the infraspinatus, supraspinatus, teres minor, and subscapularis. (sportstarsmag.com)