Last reviewed: September 29, 2026

Often nothing. A knee replacement that looks unusual on an X-ray can work well and stay comfortable for years.

What matters more than how it looks is whether it is stable. A stable knee that bends, straightens and holds you up is doing its job, whatever the picture suggests.

That does not mean every kind of imperfect placement is the same. Some show themselves early, with pain, stiffness or a knee that does not track right. Others cause no trouble for years and then show up as loosening. Which is why a knee that looks unusual gets followed rather than ignored, even when it feels fine.

So the short answer is that how it looks on the day does not tell you much, and how it holds up over ten or fifteen years might. That is watched over time, not decided from one X-ray.

In general:

  • Feeling well is the more important signal, not the picture.
  • An unusual looking replacement is not automatically one to redo.
  • Keep the follow-up X-rays so changes get noticed early.
  • New pain, giving way or swelling is worth reporting, whatever the film showed before.

Drafted with AI assistance from published sources, reviewed and edited by Babak Sheikh, MD.

Sources:

  • Parratte S, et al. Effect of Postoperative Mechanical Axis Alignment on the Fifteen-Year Survival of Modern, Cemented Total Knee Replacements. J Bone Joint Surg Am. 2010. https://doi.org/10.2106/JBJS.I.01398
  • Ritter MA, et al. The Effect of Alignment and BMI on Failure of Total Knee Replacement. J Bone Joint Surg Am. 2011. https://doi.org/10.2106/JBJS.J.00772
  • van Hamersveld KT, et al. The Effect of Coronal Alignment on Tibial Component Migration Following Total Knee Arthroplasty: A Cohort Study With Long-Term Radiostereometric Analysis Results. J Bone Joint Surg Am. 2019. https://doi.org/10.2106/JBJS.18.00691
  • Sharkey PF, et al. Why Are Total Knee Arthroplasties Failing Today–Has Anything Changed After 10 Years? J Arthroplasty. 2014. https://doi.org/10.1016/j.arth.2013.07.024

This is general information about what published research shows. It is not medical advice and it is not about your situation. Reading it does not create a doctor-patient relationship with me. I am a retired orthopedic surgeon and I do not see patients. Talk with your own doctor before changing anything about your care. If something feels suddenly or seriously wrong, get medical care promptly rather than waiting.

This page is provided as is. I make no guarantee that it is accurate, complete or current, and medical evidence changes. Use of it is at your own risk.

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