Some observations of clinical interest and importance concerning the shoulder mechanism are reported, along with certain conclusions resulting from clinical experiences in the exploration and repair of injuries to the musculotendinous cuff. Appropriate references and credits to the work of codman were so numerous as to make their individual documentation impractical. Suffice it to say that many of the major points which have been discussed serve but to confirm the previously published 4 postulates of this great student of the shoulder mechanism.