I can't recall what injury your son had, or if you believe in natural, herbal medicines, but I am a big believer in natural and herbal stuff. With that being said, look into any salves/balms made with Comfrey. There have been several medical studies (by legit sources) that show the benefits of Comfrey for ligaments/tendons/fractures. It's nickname is "Knitbone" for it's abilities to assist with healing. On February 8th my son sustained a Grade II high ankle sprain (inner and out ligaments) at basketball practice and was put in a big ol' boot for 4 weeks. I've been using my Comfrey Salve, along with a blend of different essential oils, 2X a day for the past 3 weeks and he is almost 100%. Completely pain free and has great ROM and flexion. No swelling past day 2 of the initial injury. He can walk without the boot (but we make him still wear it) and has been able to hit at practice and throw. So, the point of this is, it has worked for him and many others. Hoping for a speedy recovery!