It can take up to three months for you to return to most activities, and likely six months to one year to fully recover to maximal strength and endurance following total knee replacement surgery. At week 12, keep doing your exercises and avoid high-impact activities that could damage your knee including running aerobics skiing basketball football high-intensity cycling At week 12, you will likely have less pain or no pain during normal activities and recreational exercise, and a full range of motion in your knee.