Hi Clarett,
Have you had a look at his calf length. The medial head of the gastroc does have a small attachment to the MM. I have found in the past that a calf release technique and relavant stretches are often quite helpful. I also agree with Karen with alignment exercises. Has he had any xrays done? If there is degenerative changes then it may be a matter of modified rest until his swelling reduces. Hope this helps