How long does it usually take to develop muscular atrophy with increased prominence of the scapular spine following a left-sided rotator cuff tear?

Muscular atrophy, particularly in the context of a rotator cuff tear, typically begins to manifest within a few weeks after the injury. Following a left-sided rotator cuff tear, the immobilization and lack of use of the shoulder can lead to muscle disuse, thus prompting atrophy.

The scapular spine may become more prominent due to the loss of muscle bulk, particularly from the supraspinatus and infraspinatus muscles, which are often affected in rotator cuff injuries. It is expected that within 2 to 3 weeks, visible signs of atrophy can develop, making this timeframe a critical period for observing muscle wasting due to disuse.

This timeline aligns with clinical observations and experiences, as the body begins to lose muscle mass relatively quickly when there is an absence of movement or strength training. Longer durations, such as 4 to 6 weeks or 2 months, would indicate more advanced atrophy that is usually not the case just a few weeks after a rotator cuff tear, as initial atrophy typically begins to be noticeable within the 2 to 3 week window.