Rotator cuff injuries can be very painful and interfere with daily activities that include lifting the arms, carrying heavy objects, and performing tasks that require a lot of arm movement. The rotator cuff consists of four tendons that hold the head of the humerus (the upper arm bone) in the socket of the shoulder joint.
The shoulder is the most mobile, but also the most unstable joint of the human body. Great mobility is necessary in order to be able to perform all daily tasks, be it work, recreation or sports. In order for this not to be a problem, it is necessary for the shoulder joint to be stable. Its mobility is enabled by an abundant articular capsule and a large disparity between the size of the head of the humerus and the joint socket of the scapula: the humeral head is 2-3 times larger than the socket.