Multidirectional Instability of the Shoulder Treatment

Overview

Shoulder dislocations occur when the head of the humerus, the long bone of the upper arm, completely moves out of the glenoid cavity of the scapula, also known as the shoulder blade. While the shoulder’s unique structure allows an exceptional range of motion for athletic and daily activities, this same flexibility makes the joint more vulnerable to instability.

In atraumatic shoulder dislocation, also called multidirectional instability, the humeral head gradually slips out of the socket over time without a specific injury or traumatic event. This condition often develops due to loose ligaments, repetitive overhead movements, or natural joint laxity, leading to pain, weakness, and a feeling that the shoulder may give way during normal activities.

What causes Atraumatic Shoulder Dislocation(Multidirectional Instability)?

Atraumatic shoulder instability develops gradually and is not caused by a single injury. It results from stretching and loosening of the shoulder capsule over time, often due to repetitive overhead motions. In some individuals, naturally loose ligaments or joint hypermobility allow the shoulder to slip out in multiple directions.

• How the Injury Occurs – Ongoing repetitive movements stretch the shoulder capsule and ligaments, reducing joint stability and allowing the humeral head to slip out of place.
• Common Everyday Causes – Poor posture, repetitive lifting, frequent overhead reaching, carrying heavy bags, and activities requiring repeated arm motion can contribute to multidirectional shoulder instability.

Atraumatic shoulder dislocation (multidirectional instability) is common in these sports:

• Golf – Repeated swinging places rotational stress on the shoulder, stretching the joint capsule.
• Gymnastics – Weight-bearing and overhead movements place continuous strain on the shoulder ligaments.
• Swimming – Repetitive overhead strokes overwork the shoulder, leading to capsule stretching.
• Tennis – Frequent serving and overhead shots gradually loosen the shoulder structures.
• Volleyball – Repeated spiking and serving motions increase stress on the shoulder joint.

Symptoms

You may have a multidirectional shoulder instability if you experience:

• Feelings of looseness or instability of the shoulder
• Recurring (repeated) subluxation
• Signs of a looseness in other joints

Non-operative treatment

Atraumatic shoulder dislocation, also known as multidirectional instability, is most often treated without surgery. The primary treatment is a structured physical therapy program guided by a trained professional. Therapy focuses on strengthening the muscles that support and stabilize the shoulder, helping compensate for loose ligaments or joint laxity. This approach is the standard treatment for non-traumatic dislocations related to hypermobility syndrome or a naturally loose shoulder joint.

Specific strengthening and control exercises are commonly prescribed to improve shoulder stability and reduce the risk of recurrent subluxation or dislocation.

Try these exercises to help address your condition:

Below is a PDF of the Exercise Program

Atraumatic Shoulder Dislocation (MDI)

Surgical Treatment

If physical therapy does not improve shoulder stability, your doctor may recommend surgery. The goal of surgery for atraumatic shoulder dislocation (multidirectional instability) is to tighten the ligaments that have been overstretched to reduce the risk of recurrent dislocations. Sometimes this can be done arthroscopically. 

Arthroscopy is a minimally invasive surgical technique that uses several tiny incisions (roughly one centimeter long) through which special instruments and a camera, attached to a thin, flexible tube, are inserted. However, sometimes, when the shoulder is very loose, a small incision on the front of the shoulder is needed to fix the instability. This surgery is called a capsular shift.