After knee replacement surgery, lingering pain can make even a short walk feel intimidating. Some patients become afraid to move, worrying that activity will damage their new joint. Yet prolonged inactivity can weaken the muscles they need to regain mobility.
Scott Wang, director of the Heng-Xin Rehabilitation Clinic in Neihu, Taipei, told The Epoch Times that recovery generally requires a gradual return to daily activities and strength training under professional medical guidance.
Although complications such as infection or implant loosening can cause postoperative pain, discomfort does not automatically mean something is wrong with the replacement. Persistent or worsening pain should be assessed so that patients can continue rehabilitation with confidence.
Why Strong Muscles Matter
Osteoarthritis, a common cause of knee pain and a leading reason for knee replacement, affects cartilage and other tissues within the joint. Advancing age is a major risk factor, but younger people can also develop the condition, particularly after joint injuries or in association with obesity.
Wang once treated a patient in his 20s who had experienced obesity since childhood and weighed 286 pounds during his teens. Wang identified the excessive load on his knees as an important contributor to his unusually early osteoarthritis.
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Previous sports injuries can also have lasting consequences. Wang has seen patients who tore a cruciate ligament in their youth develop substantial knee degeneration by their 40s. The severity of the initial injury and how well knee function is restored can influence their long-term joint health.
These examples illustrate why knee care involves more than the joint itself. The surrounding muscles provide support and help control movement. Strengthening them can help people maintain the ability to walk, climb stairs, and get up from a chair.
Wang’s grandfather offered a memorable example. Despite X-rays showing moderate to severe knee degeneration, he could still walk about 3.5 miles a day. Wang attributes his preserved mobility partly to his longstanding exercise habits and maintained muscle strength.
The aim of exercise is to preserve function and manage symptoms. The National Institute for Health and Care Excellence recommends exercise tailored to each person’s needs, including muscle strengthening and aerobic activity. Regular exercise can reduce osteoarthritis pain and improve physical function and quality of life.
Physical activity also supports weight management. For people who are overweight, weight loss can reduce the load on painful knees and improve symptoms.
How Inactivity Can Slow Recovery
After knee replacement, pain and swelling can make patients reluctant to walk or even get out of bed. However, avoiding movement for too long can contribute to muscle weakness and stiffness, making everyday activities harder to regain.
Patients should begin the activities and rehabilitation exercises permitted by their surgical team, Wang said. The type and intensity of exercise depend on the procedure, recovery stage, and individual condition.
Early rehabilitation is usually simple and closely guided. The American Academy of Orthopaedic Surgeons (AAOS) describes exercises such as tightening the thigh muscles, gently bending and straightening the knee, and walking with an appropriate assistive device. More demanding strengthening exercises are introduced as recovery progresses.
Rehabilitation does not require enduring excruciating pain. Wang’s approach is to gradually restore movement and strength while ensuring that complications are addressed and the joint is stable.
Some discomfort may occur during recovery, but increasing pain should not be dismissed. Fever, increasing redness or drainage around the wound, or new calf pain or swelling warrant prompt medical assessment.
Rebuild Strength for Everyday Movement
As recovery progresses, strengthening can help restore the movements needed for daily life. Squats are one option because they work several lower-body muscle groups, particularly the quadriceps at the front of the thighs and the gluteal muscles in the buttocks.
The following variations are intended for people whose doctor or physical therapist considers them appropriate. After knee surgery, their timing, depth, and frequency should follow the individual rehabilitation plan.
These two squat variations allow you to adjust the movement to your current strength and mobility while gradually rebuilding lower-body function.
1. Chair-Assisted Squat
Step 1: Stand while holding the back of a chair for support. Place your feet shoulder-width apart with your toes pointed slightly outward; keep your body upright and engage your core.
Step 2: Inhale, slightly bend your hips and knees, and lower your hips in a controlled manner.
Step 3: Exhale, engage your glutes and thighs to stand up, and return to the starting position. You do not have to squat all the way down immediately. If you lack sufficient muscle strength or are just beginning rehabilitation, start with the chair-assisted squat; gradually increase the depth of the squat as your muscle strength and mobility improve.
2. Deep Squat
Step 1: Stand with your feet shoulder-width apart and your toes pointed slightly outward; keep your body upright and engage your core.
Step 2: Inhale, bend at your hips and knees simultaneously, and lower yourself until your thighs are parallel to the ground, adjusting the depth according to your ability.
Step 3: Exhale, engage your glutes and thighs to stand up, and return to the starting position.
Ask your physical therapist how many repetitions to perform and when to progress. Reduce the depth or stop if the movement causes sharp pain or increasing discomfort, and seek guidance if it brings on worsening swelling.
Recovery is built through manageable steps repeated consistently. A short walk or a controlled, shallow squat can help rebuild the strength and confidence needed to move through daily life.
