You know Jim, you may be on to something here.
 
Watch this birds foot joint. Generally with MS, the tendon sheaths and foot joint on the left foot only, will fill with thick yellowish fluid. Even the scales over the foot joint area will turn opaque due to the the fluid built up in the leg. The joint will get hot, the foot pad will swell and become infected. Sometimes even the hock of the left leg will become affected as well.
 
If this becomes the case, you will need to do surgeries on this bird foot, (I am dealing with this in my flock as we speak, LOL) and get this bird on Baytril, long term. If left untreated, it will cause permanent lameness and will destroy the liver.