Multidirectional instability (MDI) of the shoulder is a medical condition characterized by excessive and abnormal mobility of the shoulder joint in multiple directions. Unlike typical shoulder stability, where the joint is primarily designed for mobility, individuals with MDI experience a heightened degree of joint laxity, making their shoulder vulnerable to dislocation or subluxation (partial dislocation) in various directions. Over time, the affected shoulder may become weaker, making it challenging to perform everyday tasks.