Orthopedics focuses on the musculoskeletal system. Learn about the diagnosis, treatment, and rehabilitation of bone, joint, ligament, and muscle conditions.
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The surgery installs the new parts, but rehabilitation is what makes them work. The success of your knee replacement depends heavily on your dedication to recovery after you leave the hospital. The new joint is just a mechanical hinge; it needs strong muscles to move it and flexible tissues to allow it to bend. Without proper rehabilitation, even a perfectly performed surgery can result in a stiff, weak knee.
This section focuses on the journey back to full function. It covers the phases of physical therapy, essential exercises, and practical tips for daily living. Recovery is a marathon, not a sprint. It involves good days and bad days. Understanding the roadmap of rehabilitation helps you stay motivated and focused on the ultimate goal: a pain-free, active life.
Rehabilitation typically begins in the hospital and continues for several months. The first phase (Weeks 1-3) focuses on reducing swelling, controlling pain, and getting moving. You will work on walking with a walker and doing gentle exercises to wake up the muscles.
The second phase (Weeks 4-6) shifts to strengthening and range of motion. You will likely transition from a walker to a cane and then to walking unassisted. The goal is to regain the ability to straighten the leg fully and bend it to at least 90 degrees. The final phase (weeks 712 and beyond) involves building endurance and returning to specific hobbies. This phase is when you really start to feel the benefits of the new joint.
A new knee must avoid stiffness. Scar tissue begins to form immediately after surgery. If you do not move the knee, this scar tissue can freeze the joint in place. You must fight for your range of motion every day.
Extension (straightening) and flexion (bending) are the two key movements. Achieving full extension is critical for walking without a limp. Both climbing stairs and sitting in chairs require good flexion. Your physical therapist will teach you specific stretches to push these limits gently but firmly.
Straightening the knee is often harder than bending it. If you cannot straighten your leg fully, you will walk with a bent-knee gait, which is tiring and causes pain.
To work on this, place your heel on a chair or stool and let gravity straighten the knee. It might be uncomfortable, but it is essential. Do not put a pillow under your knee while sleeping, as this encourages the knee to stay bent.
You need about 90 degrees of bend to sit comfortably and about 110 degrees to cycle or climb stairs easily.
Heel slides are a common exercise: lie on your back and slide your heel toward your buttocks. Use a strap or towel to gently pull the leg further if needed. Consistency is key; do these exercises multiple times a day.
The muscles around your knee, especially the quadriceps (thigh muscles), have likely weakened from years of arthritis pain. After surgery, they are also shocked by the trauma. Rebuilding this strength is vital for stability.
Exercises like straight leg raises, ankle pumps, and eventual squats or step-ups are staples of rehab. Strong muscles act as shock absorbers for the new joint. Strengthening your legs reduces the strain on the implant, facilitating easier walking and balance.
Getting back to normal life happens in stages. Walking is the best overall exercise. Start with short distances around the house and gradually increase to walking around the block. Stairs should be navigated carefully: “Up with the good leg, down with the bad leg” is the golden rule.
Driving requires that you are off narcotic pain medication and have enough reaction time to brake suddenly. For work, desk jobs can often be resumed in 4 to 6 weeks, while physically demanding jobs may require 3 months or more. Listen to your body and pace yourself; fatigue is common in the first few months.
Use your walker or cane until your therapist says you are ready to stop. Walking without a limp is better than walking unassisted with a limp.
When climbing stairs, hold the handrail. Use the strong leg to lift your body weight up, and let the surgical leg follow. This protects the healing knee from excessive force.
Do not rush back to driving. You need to be safe for yourself and others on the road. Test your ability to stomp on the brake in a parked car first.
Returning to work should be gradual if possible. Sitting for long periods can cause stiffness, so plan to stand and stretch every hour. If your job involves kneeling, you may need knee pads or modified duties.
Driving requires that you are off narcotic pain medication and have enough reaction time to brake suddenly. For work, desk jobs can often be resumed in 4 to 6 weeks, while physically demanding jobs may require 3 months or more. Listen to your body and pace yourself; fatigue is common in the first few months.
Your new knee is a mechanical device. Like a car, it lasts longer if you drive it sensibly. While you can return to an active lifestyle, avoiding high-impact pounding helps preserve the plastic liner.
Staying at a healthy weight is one of the best things you can do for your implant. Antibiotics might be recommended before dental work to prevent bacteria from entering the bloodstream and infecting the implant, though guidelines on this vary, so ask your surgeon. With care, your new knee can support you for the rest of your life.
Send us all your questions or requests, and our expert team will assist you.
It is normal for the new knee to feel warm to the touch for several months after surgery. This is due to increased blood flow as the tissues heal and remodel. If it is hot, red, and painful, that could be an infection, but warmth alone is usually normal.
You may hear or feel a click when you walk. This is the sound of the metal and plastic parts contacting each other. It is painless and usually not a cause for concern. It often decreases as your muscles get stronger.
Most patients attend outpatient physical therapy for 6 to 12 weeks, typically 2 to 3 times a week. However, you must continue doing exercises at home on your own for months to achieve the best result.
You can physically kneel, but it might feel uncomfortable or strange. The sensation on the front of the knee may be different. Using a kneeling pad helps. There is no damage done to the implant by kneeling.
Most of the healing happens in the first 3 months, but full recovery can take up to a year. You will continue to see small improvements in strength and comfort for 12 months or more. Be patient with yourself.
Most patients need prescription pain medication for 2 to 6 weeks after surgery. You should taper off as the pain improves. Many people switch to Tylenol or anti-inflammatories after the first month.
You can usually shower after 2 to 3 days if you have a waterproof dressing. If you have a standard dressing, you must keep it dry until the staples are removed, usually around 2 weeks. Do not soak in a bath until the incision is fully healed.
You can drive when you are off narcotic pain medication and have regained enough muscle control to brake safely. This is usually between 4 and 6 weeks after surgery. If your left knee was replaced and you drive an automatic, you may be able to drive sooner.
Signs of a blood clot include new or increasing pain in your calf, redness or tenderness in the calf, or swelling that does not go down with elevation. A lung clot is an emergency if you have chest pain or shortness of breath.
Blood transfusions are rarely needed for knee replacement surgery today. Minimally invasive techniques and medication to reduce bleeding have made blood loss much less of an issue than in the past.
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