Gel injections help cushion and lubricate the knee jointespecially useful for patients with osteoarthritis or cartilage wear. By improving joint movement and reducing friction, these injections help relieve pain, delay more invasive Types of Viscosupplementation Injections SNS Rheumatology Osteoarthritis Joint Pain Relief Gel Pain Gel Voltarol A gel injection for the knee is often used when the joint loses some of its natural lubrication, which can happen with arthritis or cartilage wear., The gel acts as a lubricant and shock absorber Visco supplementation for Arthritis of the Knee Darren Keiser Viscosupplements Arthritis and Rheumatology Center, PC