Recovering from knee replacement surgery is a journey toward regaining mobility and improving your quality of life. Two critical aspects of this recovery process are knee flexion (bending your knee) and extension (straightening your knee). Together, these movements allow you to perform essential daily tasks, from walking and sitting to climbing stairs.
Whether you’re preparing for surgery, currently in recovery, or helping a loved one, this guide will provide the clarity and tips you need to navigate the rehabilitation process with confidence.
What is knee flexion and why is it important after surgery?
Knee flexion refers to the ability to bend your knee. After knee replacement surgery, achieving proper flexion is essential for activities such as sitting, climbing stairs, and walking. A typical goal is to regain a range of motion close to 120-125 degrees of flexion, depending on your lifestyle needs.
What is knee extension and why does it matter?
Knee extension is the ability to straighten your knee completely. Full extension is critical for proper posture, walking, and standing. Without full extension, you may experience stiffness, uneven walking patterns, or discomfort over time.
How can I track my progress in regaining flexion and extension?
You can track progress using a goniometer, which measures the angle of knee movement, or by observing daily activities. For example, being able to bend your knee to sit comfortably or straighten it while standing is a great indicator of progress.
What is Static Progressive Stretch?
Static Progressive Stretch (SPS) is a technique using the biomechanical principle of stress relaxation and tissue elongation to restore range of motion (ROM) in joint contractures.
What is the difference between flexion and extension?
One of the major obstacles to hurdle after total knee replacement (TKR) is to gain range of motion around the knee joint.
Knee Flexion
Knee flexion is described as the bending of the knee.
Knee Extension
Knee extension is when you straighten your knee to an angle of 0 degrees when extending it out in front of you.
What is considered the normal knee range of motion?
Normal range of motion is 0 to 150 degrees of flexion.
What degree of flexion is needed for most normal activities after a knee replacement?
The knee flexion range of motion for most normal activities is 125 degrees.
Range of motion for specific activities are:
Climbing stairs: 83 degrees
Sitting: 93 degrees
Tying a shoe: 106 degrees
Squatting to lift an object: 117 degrees
What is the recovery time for a knee replacement?
Patients have different ranges of motion pre surgery and people heal at different rates. With that in mind, most patients can take care of themselves within 3-6 weeks after total knee replacement. Flexion goals during recovery are 0-2 weeks, 65-90 degrees; 2-6 weeks, 115 degrees or more. It may take 4-6 months or up to a year to fully recover and realize the benefits of TKR.
Learn more about the timeline for knee replacement recovery!
Recovering full knee flexion and extension after knee replacement surgery is essential for restoring your mobility and independence. While physical therapy and consistent exercise are vital, having the right tools can make all the difference in achieving your recovery goals.
The NeeHab device is designed specifically to improve knee flexion (and extension), helping you regain your range of motion more effectively. By providing gentle, controlled assistance, NeeHab complements your rehabilitation plan, reducing discomfort and supporting steady progress. Whether you’re struggling with stiffness or aiming to reach that next milestone, NeeHab can be your trusted partner on the road to recovery.
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