Fig. 1

Posterior view on the middle trapezius muscle with the specimen in prone position. The middle trapezius (between green lines) originates from the aponeurosis (purple line) and extends laterally until inserting into the lateral two thirds of the scapula spine and the acromion (black lines). It can be observed that the upper part of the middle trapezius curves posteriorly around the lateral clavicle and AC joint. The blue dashed lines mark the proposed harvesting site for a middle trapezius transfer (MTT) for treatment of irreparable supraspinatus tendon tears