You did everything right — you had the replacement, put in the rehab, waited for the recovery everyone promised. And yet the knee still hurts. If that's you, the first thing to know is that you are not imagining it, and you are far from alone.
Persistent pain after knee replacement is common
Chronic pain following total knee replacement affects roughly 16–20% of patients (systematic review of PNS for chronic knee pain after TKA). That's not a rare complication — it's a sizeable group of people whose surgery went technically well but who still hurt. Persistent post-surgical pain is also the leading driver of dissatisfaction after knee replacement (review of persistent pain after TKA).
Being told "the X-ray looks perfect" while you're still in pain is one of the most frustrating experiences in orthopedics. The explanation is usually not that something is broken.
Why a "successful" replacement can still hurt
When the implant is well-positioned and stable, ongoing pain often comes from the nerves rather than the joint itself. Surgery can irritate or sensitize the nerves around the knee, and over time the nervous system can amplify those signals — a process that continues even after the tissues have healed. In other words, the hardware is fine, but the pain signal has become the problem.
This matters enormously for what comes next, because a signal problem calls for a signal solution — not necessarily more surgery on the joint.
What actually helps: targeting the pain signal
Peripheral nerve stimulation (PNS) is designed precisely for this situation. A thin lead is placed near the nerves carrying the pain message, delivering gentle impulses that interrupt it before it reaches the brain. The results in post-replacement knee pain have been striking: in a feasibility study of percutaneous PNS after total knee replacement, pain fell an average of 93% at rest, and 57% of participants stopped opioids within the first week (feasibility study of percutaneous PNS after TKA). A broader systematic review found PNS to be an effective option for chronic knee pain following replacement across nine studies.
For a population that's genuinely difficult to treat — and often stuck cycling through medications — that's a meaningful path forward.
A reversible option that doesn't mean more surgery
The feature that reassures most patients is that PNS doesn't commit you to anything up front. It's minimally invasive and performed outpatient, and it's reversible: you trial it for several days with an external device, judge the relief for yourself in ordinary life, and only proceed to a small permanent implant if it clearly works. If it doesn't, the lead comes out — no revision surgery, no permanent change.
If you're earlier in your knee journey, our guides on avoiding knee replacement and what "bone-on-bone" really means may also help.
Living with pain after the surgery that was supposed to end it is exhausting — but it's not the end of the road. Our 2-minute knee assessment is a plain-language place to start, and you can explore the outpatient knee treatments we offer in more detail.
