Can Exercise and Strength Training Delay Knee Replacement?

When knee arthritis starts limiting activity, patients face a frustrating paradox. Movement hurts, so they move less. But moving less leads to weaker muscles, lower endurance, weight gain and declining mobility, which can make an arthritic knee even harder to live with. Breaking that cycle is one reason Ahmed Siddiqi, D.O., MBA, FACS, an orthopedic surgeon and joint replacement specialist with Texas Center for Joint Replacement who is on the medical staff at Texas Health Plano, makes strength and movement a core part of arthritis care. "An arthritic knee doesn't exist in isolation," Siddiqi says. "It belongs to a whole person. The muscles around the joint, body weight, balance, conditioning and overall health all affect how that person functions."

Exercise Can't Reverse Arthritis, but It Can Change Function

Strength training won't regrow cartilage lost to advanced osteoarthritis, and it won't make an arthritic X-ray look normal again. But an X-ray isn't the only thing that determines how well you move. The quadriceps, hamstrings and hip muscles support the knee, absorb force and stabilize the leg. Stronger muscles can help some people function better despite the arthritis. That's why exercise is among the most strongly recommended treatments for knee osteoarthritis in professional guidelines. "We may not be able to change the X-ray with exercise," Siddiqi says. "But in the right patient, we can change what that X-ray means for their daily life." For some people, that improvement helps postpone surgery. For others, it makes symptoms more manageable while they decide on timing.

What Kind of Exercise Is Best?

The answer depends on the person, but most plans combine two things.

Low-impact cardio. Cycling, swimming, water exercise and walking are often easier on an arthritic knee than running or jumping.

Strengthening. Building the quadriceps, hips and glutes supports walking, stairs and balance. Common starting points include straight-leg raises, sit-to-stands from a sturdy chair, bridges and side-lying leg lifts. The key is progression, not punishment. "Exercise should challenge the body without repeatedly overwhelming the joint," Siddiqi says. "There's a difference between the productive discomfort of getting stronger and repeatedly provoking severe joint pain." A useful rule of thumb: mild soreness that settles by the next day is generally fine. If pain or swelling is worse the next day, scale back. A physical therapist can tailor a program to your diagnosis and overall health.

Body Weight Matters, and the Conversation Should Be Constructive

The knee absorbs substantial force with every step. Research has found that each pound of body weight lost can reduce the load on the knee by about four pounds per step, which adds up across thousands of steps a day. For patients carrying extra weight, sustainable weight loss can ease stress on the joint and improve overall health. But Siddiqi believes the conversation should focus on support, not judgment. "Telling someone to lose weight is not a treatment plan," he says. "We should be helping patients improve strength, nutrition, metabolic health and activity in a realistic way."

If Surgery Becomes Necessary, the Work Still Counts

Patients who go into surgery stronger, better conditioned and better nourished are often better prepared for the demands of recovery. This preparation is sometimes called "prehab." "I want patients thinking about recovery before they ever enter an operating room," Siddiqi says. "The work you do before surgery matters." That can include strengthening, addressing health factors such as blood sugar and nutrition, and understanding what recovery will require.

Delaying Surgery Isn't Always the Goal

Putting off knee replacement as long as possible isn't automatically a sign of success. If exercise and other treatments keep a patient active and satisfied, waiting may be exactly right. But if arthritis is advanced and pain keeps limiting life despite reasonable treatment, more delay may not serve the patient's goals. "The objective isn't to avoid surgery at all costs," Siddiqi says. "It's to help someone live well. Sometimes that means avoiding an operation. Sometimes it means preparing someone exceptionally well for one."

Find a joint replacement specialist today who can assist with your joint pain. Or to learn more about your joint health, take our hip and knee health assessment.

Physicians employed by Texas Health Physicians Group are not employees or agents of Texas Health Resources hospitals.