Brendan, this type of muscle patterning that produces a voluntary sulcus or partial subluxation is not an isolated finding in the MDI population.

From my experience it usually a dominant pattern of Pec Major and Lats Dorsi pulling the shoulder down and in. Most likely in a position where the shoulder blade is rounded forwards.

Multidirectional laxity is most likely what you have with symptoms and signs of instability only on one side.

You can have a multidirectional laxity and not report any symptoms of instability.

Physiotherapy will not miraculously tighten your laxity but it will help to change your muscle patterning and hence improve stability through your symptomatic range.

This requires a structured and specific program looking at shoulder blade stability and upward rotation coupled with a targeted and functional rotator cuff and core muscle activation and strengthening program over a 6+ month timeframe.

But usually you should see good early results.

Keep at it but don't be too keen to increase load too quickly as you have to get the fundamentals down as to what the correct muscle pattern should be.

All the best.

Luke

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