The fact that your client has a diagnosis leads me to believe that she has seen a health care specialist. So, my first question would be — what did she suggest?
A calcified tendon (also called calcific tendonitis
) can happen anywhere, but most commonly it occurs in the shoulder. It is caused by a build up of calcium in the tendon and is not arthritis (that is a problem with a joint). We are not really sure why it happens but it is probably related to aging, wear and tear. It can wax and wane on its own, but while it is present it can cause pain, stiffness and limited range of motion (but some people have it and don’t experience any symptoms.) A doctor may suggest treatments which could include shockwave therapy, lavage (injecting saline into the calcium deposit), ultrasound or surgery. Anti-inflammatory or pain killer pills may also be prescribed.
I am not aware of any studies showing yoga to be effective at treating calcific tendonitis, but sometime physiotherapy is recommended, which includes stretching and strengthening the area. If a client has gone through lavage or shock wave treatments, the area can be quite painful while healing, and stretching during recovery is very important. It is also important to avoid reoccurrence.
So, bottom line — what does the doctor suggest, and then — yes, some mobilization and strengthening is probably a good idea. Take it easy at first and work towards more as her tolerance improves. The upper body Pawanmuktasanas may be a good beginning practice. (They are described here