Why Is My Knee Still Stiff After Knee Replacement?
Updated: Sep 5
Pain, swelling and stiffness are closely linked after knee replacement. A knee that is repeatedly overloaded often becomes more swollen, and a swollen knee is harder to bend, straighten and activate strongly. The aim is enough loading to stimulate recovery without repeatedly overwhelming the joint.
For this stage of knee replacement recovery, the most useful priorities are usually:
getting the knee moving regularly while managing swelling
working on both knee bend and full straightening rather than focusing on only one
rebuilding quadriceps, hip and calf strength
improving walking quality and gradually reducing reliance on walking aids
Knee replacement rehabilitation is rarely perfectly linear. Swelling, sleep, activity and pain can change from day to day. Progress the overall workload when the knee settles back toward its usual baseline by the next day; if swelling, heat, stiffness or limping clearly escalate, reduce the dose rather than abandoning movement altogether.
Use a simple traffic-light approach: mild symptoms that settle are usually acceptable; a clear increase that lasts into the next day means reduce the dose; severe or rapidly worsening symptoms need review. Keep some movement going even on a lighter day unless your team has told you otherwise.
forcing range of movement so aggressively that swelling repeatedly flares
measuring success only by degrees of bend and ignoring strength and walking
dropping crutches before gait is controlled
doing the same easy exercises for weeks without progression
When should you get extra help?
Urgent review is needed for symptoms such as sudden shortness of breath or chest pain, marked new calf swelling, wound discharge with increasing redness or fever, or a sudden major deterioration. If the knee is persistently becoming stiffer, more swollen or less functional rather than slowly improving, contact the surgical or physiotherapy team.
If you need advice tailored to you, book a physiotherapy assessment.
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