What Are the Warning Signs After Knee Replacement?
Updated: Sep 5
Most recovery symptoms after knee replacement are expected, but some changes need prompt medical attention. After a total knee replacement, the tissues around the joint are healing while you are also asking the leg to move, take weight and become stronger again. That means symptoms can change from morning to evening and from one week to the next. The most useful way to judge recovery is to look for a gradual improvement in function: easier transfers, steadier walking, better knee movement, greater exercise tolerance and less reliance on walking aids.
What is usually happening during recovery?
Increasing redness, wound discharge, fever or feeling systemically unwell can suggest infection. New calf pain, marked one-sided swelling, heat or tenderness can be concerning for a blood clot. Chest pain or sudden breathlessness needs emergency assessment. A knee that is progressively more painful rather than gradually settling also deserves review.
Rehabilitation should be criteria-led rather than based only on the calendar. Two people at the same week after surgery may appropriately be doing different amounts because their swelling, range of movement, strength and confidence are different. Progress one variable at a time where possible: for example, increase walking distance before also adding substantially more resistance and more repetitions on the same day.
What should you do about it?
Use the overall trend rather than one difficult hour as your guide. If pain, swelling or function is clearly worsening, or you are worried about the wound, contact your surgical team, GP or NHS 111. For chest pain or significant breathing difficulty, seek emergency help.
How to judge whether you are doing too much or too little
If you are improving but slowly, the answer is usually not to abandon rehabilitation. Instead, identify the limiting factor: swelling, knee bend, knee extension, quadriceps weakness, balance, confidence or exercise dosage. Targeting that specific problem is more useful than simply doing more of every exercise.
When physiotherapy can help
A physiotherapy review can help if you are unsure whether your progress is appropriate, cannot move beyond the early exercises, still have a marked limp, struggle with stairs or transfers, or repeatedly flare the knee whenever you try to progress. Assessment can then guide a more individual plan for movement, strengthening, walking and return to normal activities.
A structured plan for the whole recovery
The Complete Total Knee Replacement Recovery eGuide brings the stages of rehabilitation together in one place, including mobility, strengthening, progression and practical recovery guidance. It is designed to complement, not replace, advice from your surgeon or physiotherapist and can help you understand what to work on as your function improves.
Prefer guided group exercise? Book the strength and balance exercise class.
If you need advice tailored to you, book a physiotherapy assessment.
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