Multidirectional instability occurs when the capsule that holds the shoulder in place is stretched, torn or naturally loose. This situation results in less static stability (stability arising from the joint itself) in the shoulder and results in greater aberrant movement in the shoulder joint. This can result in impingement of the rotator cuff and result in further injuries. Treatment of multidirectional instability requires conditioning of the muscles that help keep the head of the humerus (the top of the arm in the shoulder joint) in addition training of the muscles of the trunk and hip to provide a foundation for shoulder stability is also extremely important.