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How far should I be able to bend my knee after replacement?

Author

Daniel Moore

Published Jan 23, 2026

Within 7 to 10 days after your knee replacement, you should be able to get your knee entirely straight/full extension (Fig. 1) (no space between the back of your knee and the table) and you should be able to bend/flex your knee to at least 90 degrees (Fig. 2). 90 degrees is the same thing as a right angle.

How far should my knee bend after knee replacement?

Bending and straightening the knees becomes reduced over time. The goal after knee replacement is to get the knee to at least 120 degrees of flexion or bending motion. You need at least 110 degrees to enter and exit a car and most people need 110 to 120 degrees to ride a bike.

How can I improve my knee flexion after knee replacement?

Place your unaffected leg under your affected leg, fully supporting it. Slowly let your affected knee bend by lowering your feet. At some point, you will feel a gentle stretch. Hold for the desired amount of time, and then use your unaffected side to help straighten your knee out once again.

What is the maximum flexion after TKR?

In most current reports, maximum flexion is greater than in earlier series. Despite this improvement, which typically ranges between 100° and 125°, activities requiring flexion beyond 120° are often impossible after TKR.

How long does pain and stiffness last after knee replacement?

By 6 weeks, pain and stiffness should continue to resolve, and isokinetic quadriceps and hamstrings strengthening exercises can be incorporated. By 3 months, most TKA patients should have achieved greater than 90% of their ultimate knee motion and pain control.

19 related questions found

Why can't you bend your knee after TKR?

Over time, scar tissue builds up inside the knee, causing the knee joint to shrink and tighten. Scar tissue from arthrofibrosis can severely impact your knee's range of motion. In the most severe instances, it can result in a permanent inability to bend and straighten the knee.

What should my range of motion be 6 weeks after TKR?

This amount of flexion allows for walking without assistance, standing, and some stair climbing (likely with support). Before you leave the hospital, your doctor will be looking for flexion as close to the 90° as possible. Stage 2 (2 to 6 Weeks)—115° flexion.

What is normal range of motion for knee?

A completely straight knee joint will measure 0° and a fully bent knee will have a flexion of at 135° degrees. These are the benchmark “normal” ROM measures. If you've had a knee replacement, your physician may look for a knee flexion in the 125-135 degree range once you're fully recovered.

What is the most commonly reported problem after knee replacement surgery?

Knee replacement complications can result from surgery or a faulty implant. Loosening is one of the most serious complications after knee surgery and pain is the most common one. Loosening can cause bone fractures, instability and serious falls. Almost all serious complications require revision surgery.

Can only bend knee 90 degrees?

If you can't bend your knee to a 90 degree angle or straighten out your leg because of pain, stiffness and swelling, then it is likely that you've torn your ACL. Set an appointment with your doctor.

Is stiffness normal after knee replacement?

This is normal during the early stages of recovery, as the knee experiences swelling which causes temporary stiffness. This should begin to subside within the first month or so after the operation; if it continues to feel stiff or if the stiffness gets worse, contact your surgeon.

How much should you walk after knee replacement?

Your orthopaedic surgeon and physical therapist may recommend that you exercise for 20 to 30 minutes daily, or even 2 to 3 times daily; and walk for 30 minutes, 2 to 3 times daily during your early recovery.

What happens at 4 weeks post op knee replacement?

Knee pain and function greatly improve during the first few weeks after knee replacement surgery. Significant improvements continue during weeks 4 through 6. By week 6, the majority of patients are off pain medications and have resumed their day-to-day routines.

What are the signs of a failed knee replacement?

What are the signs of knee replacement failure? The most common symptoms of a failed knee implant are pain, decrease in joint function, knee instability, and swelling or stiffness in the knee joint.

How far should I be walking 3 weeks after TKR?

Although everyone progressed at a different pace based on numerous factors, some common timeframes are: 3 weeks after surgery: At this point, you should be able to walk for more than 10 minutes at a time, without a walker or crutches.

What is the fastest way to recover from knee surgery?

5 Tips to Speed Up Recovery After Knee Surgery

  1. Follow All Physician Recommendations. You should always heed all of your surgeon's instructions and advice. ...
  2. Walk Frequently Once You're Allowed. ...
  3. Eat Healthy Foods. ...
  4. Get Plenty of Sleep. ...
  5. Do Physical and Occupational Therapy Exercises.

When can I walk up stairs normally after TKR?

For the first several weeks after TKR, you will likely go up/down stairs one foot at a time (non-reciprocally). The pattern to follow is: “Up with the good leg, Down with the bad (operated)”. As you get stronger, I encourage you to try to climb stairs alternating one foot per step; holding on to the banister will help.

Can knees bend hardly?

Potential causes of knee pain when bending

Muscle strains — The muscles around the knee can become tight and strained, actually making it painful to bend. Arthritis — Breakdown of knee cartilage and the drying out of lubricating joint fluid can cause joint inflammation and associated stiffness and pain.

Can barely bend knee?

There are still many possible reasons why you can't bend knee without pain and these include dislocated kneecaps, neuropathy in the knee, torn body, and meniscus tear.

How can you tell if your knee replacement is too big?

If the implanted femoral component is larger than the patient's natural femur, it can result in the patient struggling to regain acceptable flexion and complain of “tightness” when they try to bend their knee. Sometimes this is referred to as “over stuffing.”

What you Cannot do after knee replacement?

After your surgery, avoid stools, sofas, soft chairs, rocking chairs, and chairs that are too low. When getting up from a chair, slide toward the edge of the chair, and use the arms of the chair, your walker, or crutches for support to get up.

What happens at 5 months after knee replacement?

The conventional wisdom, and most clinical literature, agree that at five months after knee replacement it is unlikely to see much gain in flexion (bending the knee back). It is understood that knee replacement patients have until three months to improve their flexion, and six months to finish off their knee extension.

Can you cross your legs after total knee replacement?

After your knee replacement surgery, it is important to remember that you should not cross your legs at any time.