Free Guide to Preparing for Knee Replacement Surgery

Understanding Knee Replacement Surgery: What Happens Before the Operating Room

Knee replacement surgery, also called knee arthroplasty, is a procedure where a surgeon removes damaged cartilage and bone from your knee joint and replaces it with artificial components made of metal and plastic. According to the American Academy of Orthopaedic Surgeons, more than 600,000 knee replacement surgeries occur each year in the United States, making it one of the most common orthopedic procedures performed.

Before you reach the operating room, you'll go through several stages of preparation that typically span weeks or months. This timeline allows your medical team to evaluate your overall health, address any existing conditions, and help you understand what to expect. Your surgeon will order imaging tests like X-rays or MRI scans to assess the extent of knee damage. These images help your surgical team plan the exact positioning and sizing of your artificial knee components.

Your primary care doctor will conduct a complete physical examination and review your medical history. This evaluation identifies any conditions that might affect your surgery or recovery, such as heart problems, diabetes, or blood clotting disorders. You may need blood tests to establish baseline measurements and ensure your blood is healthy enough for surgery. Some patients require additional testing like an electrocardiogram (EKG) if they have heart concerns.

The pre-surgery phase also includes education. Your surgeon and their team will explain why knee replacement is recommended for your situation, what the procedure involves, and what recovery typically looks like. You'll learn about pain management options, rehabilitation requirements, and realistic timelines for returning to activities. This information helps you set appropriate expectations and mentally prepare for the weeks ahead.

Practical Takeaway: Schedule a detailed conversation with your surgeon about your specific knee condition and why replacement is recommended rather than other treatments. Ask for written materials or videos that explain the procedure, and request answers to any concerns before your surgery date.

Medical Evaluation and Testing: What Your Doctor Needs to Know

Your surgical team needs a complete picture of your health before operating. This goes beyond checking your knee. Knee replacement surgery requires anesthesia, which affects your entire body. Your medical evaluation will examine your heart, lungs, blood pressure, and other systems to identify any risks that need management.

Blood work typically includes a complete blood count (CBC) to check for anemia or infection, and a metabolic panel to assess kidney and liver function. These tests reveal whether your body can handle surgery and anesthesia. Your surgeon may order blood type and crossmatch testing so compatible blood is available if needed during surgery, though modern techniques have reduced the need for transfusions. According to the American College of Surgeons, fewer than 5 percent of knee replacement patients now require blood transfusions.

If you have diabetes, your doctor will check your blood sugar control, as high glucose levels slow healing and increase infection risk. If you take blood thinners for heart conditions or blood clots, your team will plan when to stop these medications before surgery and when to restart them afterward. Stopping too early increases clot risk; continuing too long increases bleeding risk during surgery. These decisions require careful coordination with all your doctors.

X-rays and imaging studies of your knee show bone density and the exact pattern of damage. For some patients, an MRI provides additional detail about cartilage and soft tissues. Your anesthesiologist will review all test results and may request additional cardiac testing if you have heart risk factors. This specialist determines what type of anesthesia is safest for you—whether general anesthesia (where you're fully asleep) or regional anesthesia (where your lower body is numbed but you remain conscious).

Discuss all medications and supplements you take, including over-the-counter drugs and herbal products. Some medications affect bleeding or anesthesia. Ibuprofen, aspirin, and certain supplements should typically be stopped 1-2 weeks before surgery. Your doctor will give you specific instructions about which medications to continue and which to pause.

Practical Takeaway: Create a complete list of all medications, supplements, and herbal products you use, including doses and frequency. Bring this list to your pre-surgery appointments. Ask your surgical team for written instructions about which medications to stop and when to stop them.

Physical Preparation and Prehabilitation: Building Strength Before Surgery

One of the most important steps you can take before knee replacement is prehabilitation—exercises and conditioning performed before your surgery date. Research published in medical journals shows that patients who complete prehabilitation recover faster and achieve better movement in their replaced knee compared to those who don't exercise beforehand.

Your physical therapist will teach you exercises designed to strengthen the muscles that support your knee, particularly your quadriceps (the large muscle on the front of your thigh) and hamstrings (muscles on the back of your thigh). Strong muscles help stabilize your new knee and take stress off the artificial joint. Exercises typically include straight leg raises, where you lie down and lift your leg straight out, keeping your knee locked. This simple movement activates your quadriceps without stressing your damaged knee. Wall squats, where you lean against a wall and slowly bend your knees, also build strength while controlling the pressure on your joint.

Range-of-motion exercises maintain and improve flexibility. Your therapist might teach you to sit and straighten your knee, then bend it as far as comfortable. These movements prevent stiffness before surgery and help your knee move freely after your new joint is in place. Flexibility work also includes hip and ankle exercises, as these joints work together with your knee for walking and daily activities.

Cardiovascular conditioning matters too. Walking, stationary cycling, or water aerobics improve your heart and lung function before surgery. Better cardiovascular health means your body handles the surgery and anesthesia more effectively. Start slowly and gradually increase duration and intensity over weeks, always staying within pain limits. Your surgeon will advise which activities are appropriate for your knee condition.

Weight management is another preparation component. Every pound of extra body weight puts additional stress on your new knee during recovery and long-term use. If you're overweight, losing even 5-10 pounds before surgery reduces stress on your healing joint and may improve your recovery timeline. This isn't about appearance; it's about protecting your surgical outcome.

Don't overlook balance training. Simple exercises like standing on one leg or walking in a straight line improve your stability. Better balance before surgery means fewer falls during your recovery period when you're learning to move with your new knee.

Practical Takeaway: Ask your doctor for a referral to physical therapy at least 4-6 weeks before your surgery. Work with your therapist to develop an exercise routine you can do at home. Aim for consistency—30 minutes most days of the week—rather than intense workouts. Record which exercises you do and how you felt, so you can track progress and know what helped.

Lifestyle Adjustments and Home Preparation: Setting Yourself Up for Recovery

Your home environment plays a critical role in recovery success. After knee replacement, you'll have limited mobility for the first 4-6 weeks. Planning your living space now prevents accidents and makes daily life manageable when moving is difficult.

Remove tripping hazards from pathways you'll use. Throw rugs, electrical cords, and pet toys create fall risks for someone with a recovering knee. Move furniture to create clear walking paths. If you have stairs, plan to sleep on your home's main floor if possible, rather than climbing stairs multiple times daily. If stairs are unavoidable, discuss with your physical therapist how to navigate them safely. You'll typically need a railing and may need to go up and down slowly, one step at a time.

Arrange your bedroom and bathroom for accessibility. Place your bed at a comfortable height—high enough that you don't have to drop down onto it, as bending and sitting deeply stresses your new knee. If your bed is low, add a bed wedge or use a temporary frame to raise it. In the bathroom, consider a shower chair or bench so you can sit while bathing. Grab bars in the shower prevent falls when you're balancing on one leg. A raised toilet seat makes sitting and standing easier. These modifications cost $50-300 total but significantly reduce strain on your healing knee.

Stock your home with items you'll need within easy reach. Keep glasses, medications, phone chargers, books, and remote controls on tables near where you'll spend time. During recovery, you won't want to search for things or make unnecessary trips. Have easy-to-prepare foods available—