A shoulder that feels excessively loose, that slips or shifts in multiple directions without any specific injury or trauma, and that causes pain and apprehension during daily activities or sport is the hallmark of multidirectional shoulder instability. It is a condition that is often mismanaged because it requires a different treatment approach from a simple traumatic dislocation.
What is Multidirectional Shoulder Instability (MDI)?
Multidirectional instability, or MDI, occurs when the shoulder joint is unstable in more than one direction, typically anteriorly, posteriorly, and inferiorly. Unlike traumatic instability caused by a specific dislocation, MDI is usually related to inherent looseness of the shoulder capsule and ligaments, either constitutional hyperlaxity present from birth or acquired through years of repetitive overhead stretching.
It is particularly common in swimmers, gymnasts, and other overhead athletes who subject the shoulder to repeated multi-directional loads over years of training.
Types of Multidirectional Shoulder Instability (MDI)
Causes
Generalised ligamentous laxity is the primary underlying factor in many MDI patients. Repetitive overhead sport, particularly swimming, gymnastics, and volleyball, can stretch the shoulder capsule over time, producing acquired laxity. A positive sulcus sign, where a visible gap opens beneath the acromion when traction is applied to the arm, is a characteristic clinical finding.
- A feeling that the shoulder is loose, wobbly, or shifting in multiple directions
- Dull aching shoulder pain rather than the sharp apprehension of a traumatic dislocation
- Subluxation, a sensation of partial slipping without full dislocation, during overhead activities
- Fatigue and pain with prolonged overhead activity in swimmers and gymnasts
- Generalised joint hypermobility in other joints such as the fingers, elbows, and knees
Diagnosis
Clinical examination, including the sulcus test, load-and-shift test, and posterior stress test, assesses the degree and direction of instability. The key is distinguishing pathological MDI from normal hyperlaxity in flexible individuals who are pain-free.
Treatment
Rehabilitation Programme
The first line of treatment for MDI is a prolonged, supervised rehabilitation programme of 3 to 6 months, focusing on rotator cuff strengthening and scapular stabilisation to dynamically control the unstable joint. This non-surgical approach succeeds in the majority of MDI patients and is always attempted before considering surgery.
Arthroscopic Capsular Plication (if surgery is required)
In patients who have completed a thorough rehabilitation programme without adequate improvement, Dr. Kushalappa performs arthroscopic capsular plication, where the stretched and redundant shoulder capsule is tightened using suture anchors to reduce the volume of the joint and restore stability. This is a technically demanding procedure and is only performed after rehabilitation has been given a genuine trial.
Why Choose Dr. Kushalappa Subbiah in Bangalore?
Dr. Kushalappa Subbiah completed a Fellowship in Shoulder Surgery at the Sydney Shoulder Research Institute, where he trained in advanced arthroscopic shoulder procedures including labral repair and reconstruction. He holds the International Olympic Committee (IOC) Diploma in Sports Medicine, and has direct clinical experience managing shoulder injuries in Indian athletes across cricket, swimming, tennis, and contact sports. He is appointed as a Consultant Shoulder Surgeon at NH Hospital, Bangalore.