A Patient's Guide to Knee Replacement Surgery

What You'll Learn in This Guide

Knee replacement surgery is a major decision, but it can provide significant relief from chronic pain and stiffness. This guide will walk you through the entire process, from understanding your pain to navigating a successful recovery.

• Why do knees become painful and stiff
• Nonsurgical and surgical treatment options
• How to prepare your home, body, and medications before surgery
• What happens during the procedure and in the hours that follow
• Key steps to prevent complications and start therapy safely
• Recovery exercises and movements to avoid
• Warning signs to watch for and when to contact your surgeon

Why Your Knee May Hurt

You use your knee with every step, so damage to this crucial joint can make everyday life difficult. Climbing stairs, getting up from a chair, or walking a few blocks can become painful and frustrating. The good news is that many people find relief with the right care, including knee replacement when it's the best option.

Knee problems often develop slowly over time. Pain and stiffness can limit activities you enjoy and make daily tasks harder. Common causes include:

• Osteoarthritis: The gradual wear and tear of joint cartilage from years of use.
• Inflammatory arthritis: Long-term diseases like rheumatoid arthritis or gout that inflame the joint lining.
• Post-traumatic arthritis: Joint damage that develops after a prior injury that did not heal properly.

How a Healthy Knee Works

The knee is a hinge joint where the thighbone (femur) meets the shinbone (tibia). In a healthy joint, several parts work together to provide smooth, comfortable movement, allowing you to bend, straighten, squat, and turn without pain.

• Cartilage: A smooth, slippery cushion covering bone ends and the underside of the kneecap that lets the joint glide and absorbs stress.
• Ligaments: Tough bands of tissue that hold the bones together and keep the knee stable.
• Muscles: The quadriceps and hamstrings, which power movement.
• Tendons: Strong cords that attach muscles to bones.

What Happens When the Knee Is Damaged

When cartilage wears down, it cannot fully repair itself. Stiffness may appear first, followed by pain as roughened bone surfaces rub together. This can lead to swelling, catching, grinding, or a constant ache, even at rest.

• In osteoarthritis, cartilage thins with age and use, leading to irritation of bone surfaces. Excess body weight or alignment issues, such as bowlegs or knock knees, increase joint stress and can accelerate wear.
• In inflammatory arthritis, conditions such as rheumatoid arthritis cause chronic inflammation of the joint lining, which can erode cartilage and lead to joint stiffness.
• In post-traumatic arthritis, a previous fracture or injury may heal out of alignment, creating uneven pressure that wears down cartilage more quickly.

Osteoarthritis

In osteoarthritis, the smooth articular cartilage gradually wears away, leading to friction between bones. It is often linked to aging, previous injuries, or excess body weight. Common signs include:

Inflammatory Arthritis

A long-term condition—such as rheumatoid arthritis or gout—can lead to swelling and warmth (inflammation) in the joint lining. Over time, this can wear away the cartilage and cause the joint to become stiff.

Post-Traumatic Arthritis

A previous fracture or injury may heal out of alignment, creating uneven pressure that wears down cartilage more quickly.

Could Surgery Be Right for You?

An orthopedic surgeon evaluates bone and joint problems. They will examine your knee, review your medical history, and order imaging tests like X-rays or an MRI to see how much damage is present. Together, you and your surgeon can decide what treatment best fits your goals.

Knee replacement can offer meaningful benefits:

• Pain relief: Most people experience a significant drop in pain within months.
• Stronger legs: As pain eases, you can move more and rebuild muscle.
• Better daily function: Routine tasks and low-impact activities become more comfortable.
• Long-lasting results: Modern knee replacements often last 15 to 20 years or longer, depending on your age, weight, and activity level.

Your Treatment Options

Surgery is just one option. Your surgeon will likely suggest a stepwise plan and discuss the benefits and risks of each approach.

• Nonsurgical care: This includes activity modifications, weight loss, physical therapy, bracing, injections, and medications.
• Other surgeries: Procedures like arthroscopy (using a small camera to treat certain issues) or osteotomy (realigning the bone to reduce stress) may be considered.

Preparing for a Successful Surgery

Every surgery carries some risk. It's important to ask questions and understand what the procedure can and cannot do for you. Knowing how to prepare can lead to a smoother recovery.

Risks and Complications

Possible risks include:

• Infection at the incision site or around the implant
• Blood clots in the legs or lungs
• Ongoing pain, stiffness, or instability
• Injury to nearby nerves or blood vessels
• Loosening or wear of the implant over time, which could require revision surgery

Prepare Your Home and Arrange Help

A few changes at home can make recovery safer and easier. Reduce hazards and set up daily items within easy reach to limit bending and stair climbing.

• Create a resting space on your main floor to avoid stairs.
• Stock up on pantry staples and frozen meals, storing them between your waist and shoulder height.
• Clear clutter, remove throw rugs, and secure loose electrical cords.

You will not be able to drive for several weeks. Arrange for a family member or friend to help with transportation, groceries, and errands. If you live alone, plan for someone to stay with you for the first few days.

Get Medical Clearance and Review Medications

Before surgery, your primary care doctor will ensure you are ready. You may have an EKG, blood tests, and urine tests. Conditions like diabetes or high blood pressure must be well-managed to reduce risk. If you smoke, quitting before surgery significantly lowers complications and improves healing.

Tell your surgeon about all medications and supplements you take. Some, like blood thinners, aspirin, or ibuprofen, increase bleeding and must be paused with your doctor's guidance. Additionally, it is critical to complete any major dental work before surgery, as bacteria from your mouth can travel through the bloodstream and infect a new joint.

The Day of Surgery: What to Expect

Follow all instructions about eating and drinking before your procedure. When you arrive for surgery, you will be guided through the final steps.

You will meet the anesthesiologist, who will keep you comfortable during surgery. An IV line will be started to give you fluids and medicine. For your safety, the team will confirm your name, the procedure, and which knee is being operated on, marking it with a pen.

Inside the Operating Room

An incision is made on the front of the knee. The surgeon removes the damaged bone and cartilage surfaces and shapes the remaining bone to fit the new implant, called a prosthesis. The components are secured to the thighbone, shinbone, and kneecap to create a new, smooth-gliding joint. The incision is then closed with stitches, staples, or surgical glue.

Your Recovery Journey

Right After Surgery

You will wake up in a recovery area where your team will monitor you closely and manage your pain. When you are fully awake, you will be moved to a hospital room. A physical therapist will see you soon after, often within hours, to begin gentle movements and help you stand and walk with a walker or crutches.

Protect Your Lungs and Circulation

To prevent lung complications, it's important to practice deep breathing and coughing. A nurse may give you an incentive spirometer, a device to encourage deep breaths. To reduce the risk of blood clots, you will likely receive blood thinners and wear compression stockings or boots. Simple foot and ankle exercises also help, and short, frequent walks are encouraged as soon as it is safe.

Build Strength with Physical Therapy

Your therapy program is essential for a good outcome. Early exercises focus on improving blood flow, managing swelling, and activating the quadriceps muscles that support the knee. Be sure to follow your home exercise program as instructed.

Recovery Exercises

Quadriceps Sets

Lie on your back with your leg straight. Tighten the large muscle on the front of your thigh (quadriceps) and press the back of your knee down into the bed. Hold for 5-10 seconds, then relax.

Sitting Knee Bends

Sit in a chair with a towel placed under your new knee joint. Slowly straighten your leg as much as you can and hold for a count of 5. Then bend your leg back as far as you can and hold again for a count of 5. Repeat this sequence as directed.

Getting Back to Your Routine

Expect some stiffness at first. Daily walking is key to rebuilding strength and motion. Many people can drive and return to a desk job within four to six weeks, depending on their surgeon's guidance. More physically demanding work may require three to four months of recovery. It can take six months or more to feel your best as strength and confidence grow.

Moves to Limit or Avoid

Protect your new joint by avoiding actions that place too much stress on it:

• Do not twist your knee; turn your whole body by moving your feet instead.
• Avoid high-impact activities like running, jumping, and high-intensity sports.