ARTHRO-IONX or PROMAXOL could be helpful especially if the ligament is not completely torn. Either homeopathic helps reduce pain and inflammation and stimulates healing. (PROMAXOL is ARTHRO-IONX plus the LM Potencies of each of the ingredients) I prefer to start with PROMAXOL and switch to ARTHRO-IONX for maintenance, but you can use either.
The oligotherapeutic mineral base found in the IONX products helps the body to better utilize the other nutritional substances given for a synergistic response and faster healing. The supplements I recommend in addition to PROMAXOL are probiotics, Omega 3,6,9, and MSM. I also give Ligaplex 1 by Standard Process which
contains nutrition for ligaments. Also be sure to give sufficient fresh water that is free of chlorine and fluoride. If you can gradually phase into a grain free diet that can be helpful too. This might help with weight loss. The other thing that is sometimes beneficial is to have a certified veterinary chiropractor check for spinal and hip alignment and then make any necessary corrections.
Try to limit the amount of running and jumping while the knee is still weak. Usually leash walks are in order to prevent further injury.
Please let us know how you progress or if you have any other questions.