Multidirectional instability of the glenohumeral joint

The concept of multidirectional instability (MDI) was introduced as an impo rtant clinical entity in 1980. Previously, it had received Little mention i n the literature and was not considered to be clinically relevant. MDI is a symptomatic glenohumeral subluxation or dislocation occurring in more than one direction. The basic pathology of this condition is a loose and redund ant joint capsule. Most patients with MDI can be treated successfully by co nservative methods, such as patient education, a shoulder girdle strengthen ing program, or modification of the patient's routine activity.