Gel injections for the knee involve the injection of a gel like substance into the knee joint to provide lubrication and cushioning. This treatment is often used to alleviate pain and improve mobility Hyalgan Knee Injection: Understanding Intra Articular Therapy MEDICA DEPOT Supartz Injections For Knees Treatment for Knee Osteoarthritis MEDICA DEPOT BPC 157 For Knee Pain: Early Reported Outcomes, A report on intra articular BPC 157 for knee pain described high rates of improvement: ~92% with BPC 157 alone, ~75% when combined with thymosin beta 4,