Chondroitin and glucosamine additions may help too, though it may provide mixed results. Chondroitin sulfate helps to keep cartilage from deteriorating. Glucosamine stimulates cartilage formation and repair. Dr. Barkson says they take at least four weeks to start working, and the supplements just don't suit everyone.
Once you're strong enough, your PT may suggest strengthening glutes with hip extensions. Stand behind a stubby chair. Hold your back for balance, bend your trunk 45 degrees forward. Slowly raise your right leg as high as possible without bending your knee. Break. Slowly lower the leg. Aim for eight to 12 repetitions. Repeat with your left leg. Rest and repeat the set again.