Will the Knee Function Normally After a Total Knee Replacement?

 
Many patients preparing for knee replacement surgery wonder whether the artificial knee will function like a natural joint. This comprehensive guide explains when surgery is needed, how implants work, recovery timelines, daily activities, long-term care, and what to expect after total knee replacement.
 

When Is a Total Knee Replacement Necessary?

Most patients who undergo total knee replacement are older adults with advanced osteoarthritis. Before considering surgery, they often try conservative treatments such as medication, physical therapy, and intra-articular injections. When pain becomes severe or symptoms worsen, patients consult their physician about surgical options.
In nearly all cases, patients choose surgery so they can return to a normal life without the pain and limitations caused by osteoarthritis.
 

What Does a Knee Implant Look Like?

A knee implant mimics the shape and motion of a natural knee and typically consists of three to four components. These parts are usually made from cobalt-chromium and titanium alloys, while the center section uses medical-grade polyethylene.
Although implant brands may vary, most follow similar designs and safety standards.
 

If Both Knees Have Osteoarthritis, Should Surgery Be Done on One or Both Knees?

The most common approach is to operate on the more painful knee first. In many cases, treating one knee reduces the load on the other side, making the first knee the dominant leg and lowering pain in the second knee. Some patients find that the second surgery is no longer necessary.
If a second knee replacement is needed, surgeons recommend waiting until inflammation in the first knee fully subsides — typically 3 to 4 months.
 

Simultaneous Bilateral Knee Replacement

Some patients choose to replace both knees at once. Benefits include:

• A single hospital stay
• One recovery period
• Lower overall cost
• Only one episode of postoperative pain

However, risks are higher due to a longer surgery time and increased possibility of infection.
This option is best for patients with severe, deformed osteoarthritis in both knees, who are otherwise in excellent health with no serious medical conditions that could increase surgical risk.
 

How Long Does a Knee Implant Last?

Doctors inform patients that 90 percent of knee implants last 20 years or more, depending on how well patients care for and use the new joint.
 

Postoperative Mobility and Wound Care

Patients usually begin walking training the day after surgery, and most can walk and care for themselves after that first session. Some swelling around the surgical site is normal following this major operation.
 

Physical Therapy After Knee Replacement

Daily physical therapy begins while the patient is still in the hospital, helping them regain independence and confidence in everyday activities.
After discharge, as patients resume daily routines, range of motion and muscle strength naturally improve over time.
 

Are There Side Effects After Surgery?

Mild fever and postoperative swelling are expected. However, signs of infection, such as excessive redness, pus, or abnormal swelling, require urgent medical attention.
 

Deep Vein Thrombosis (DVT)

A rare but serious complication is DVT, which causes severe leg swelling due to blood clots. Although more common in Caucasian individuals, it can also occur in Asian patients. The highest risk period is the first month after surgery.
 

Will the Knee Function Like It Used To?

While an artificial knee is not identical to a natural joint, it can significantly increase independence and mobility. Many older adults regain the ability to walk, climb stairs, and perform daily activities again, improving quality of life for both patients and their families.
 

How Long Until the Knee Functions Normally?

Most patients regain near-normal knee function within 2 to 4 weeks after surgery.
 

Daily Activities After Surgery: Stairs, Squatting, High Heels

• Climbing stairs, walking, and sitting cross-legged are typically possible soon after surgery.
• Squatting requires strong muscles, as it involves bending the knee 120–130 degrees. Achieving 100–120 degrees is considered good for older adults.
• High heels are not recommended; lower heels are safer because high heels increase pressure on the knee joint.

 

Will a Knee Implant Set Off Airport Security?

Yes. Because implants contain metal, they may trigger security alarms. Patients can use the medical card provided by Bumrungrad International Hospital to confirm the presence of a knee prosthesis.
 

Can You Exercise, Drive, or Ride a Motorcycle After Surgery?

Exercise

Recommended low-impact activities include:

• Swimming
• Water aerobics
• Cycling

High-impact sports such as running or tennis should be avoided because they may shorten the implant’s lifespan.
 
Upper-body exercises are unrestricted. Lower-body strength training should focus on quadriceps strengthening to improve walking and stair climbing.
 

Driving

Most patients can resume driving 2–4 weeks after surgery, especially if the right knee was operated on.
 

Motorcycle Riding

Since motorcycles require greater knee force, it is best to wait 1–2 months, depending on recovery.
 

How to Care for Yourself After Knee Replacement Surgery

• First 6 weeks:

  Patients can resume walking, climbing stairs, and light housework. Long-distance walking or strenuous exercise should be avoided.

• After 2–3 months:

  When the wound is fully healed, inflammation has subsided, swelling has decreased, and the knee is no longer warm, patients may resume all normal activities. Strength training can begin to support long-term joint health.

Avoid high-impact activities to prolong implant lifespan.
 

Are Joint Supplements Necessary After Surgery?

No. Since cartilage is removed during knee replacement, joint supplements are no longer needed.
 
 

About the Advanced Arthritis & Arthroplasty Center

The center specializes in treating hip and knee conditions. Our orthopedic surgeons have performed over a thousand joint replacement surgeries using high-quality implants and modern techniques.
 
We provide comprehensive pre- and post-operative care with the goal of helping patients regain quality of life and return to the activities they enjoy.