PNS vs Replacement

Joint replacement removes the damaged joint and installs a prosthetic. It's a proven, effective treatment — but it's also irreversible, requires significant recovery time, and carries surgical risks including infection, blood clots, and implant wear.

Peripheral nerve stimulation takes a different approach entirely. Instead of replacing the joint, PNS modulates the pain signals traveling from the joint to the brain. The joint itself is preserved, and the procedure is fully reversible.

Joint replacement typically requires 6 to 12 weeks of structured rehabilitation, with full recovery often taking 3 to 6 months. During this period, mobility is limited and daily activities are significantly affected.

PNS is an outpatient procedure. Most patients return to normal activities within days, not months. There's no hospital stay, no extended rehabilitation protocol, and no prolonged period of restricted movement.

Total joint replacement changes joint structure. Implantable peripheral nerve stimulation targets the nerves that carry pain signals — for some patients, that nerve-driven component matters as much as what imaging shows. PNS does not reverse arthritis, but it may calm an overactive pain pathway while you preserve anatomy and keep future options open.

Published long-term data support meaningful relief for many patients on implantable PNS out to two years in studied cohorts. In a 2026 summary of 24-month results from the multicenter COMFORT randomized trial, 85% of participants in the analyzed subset (n=39) achieved at least a 50% reduction in pain, and mean pain scores improved by 67% from baseline; responder rates by treated region (including knee) were also reported, with smaller subgroup sizes than the overall cohort. Individual results vary. Source: Practical Neurology, "Implantable Peripheral Nerve Stimulation Shows Durable Pain Relief at 24 Months" (2026), https://practicalneurology.com/news/implantable-peripheral-nerve-stimulation-shows-durable-pain-relief-at-24-months/2485516/ — citing Engle MP et al., Chron Pain Manag (2026), https://doi.org/10.29011/2576-957X.100079

Implantable PNS is intended for ongoing therapy when it helps; regulatory documentation for FDA-cleared systems describes indications, labeling, and typical pathways such as trial stimulation before longer-term implantation for appropriate patients. Example FDA premarket summary: https://www.accessdata.fda.gov/cdrh_docs/pdf23/K233162.pdf

This is the most significant distinction. Joint replacement is permanent — once the joint is removed, it cannot be restored. If complications arise or the prosthetic wears out, revision surgery is the only path forward.

PNS is fully reversible. If it doesn't provide adequate relief, or if your condition changes, the device can be removed and you retain all future treatment options, including replacement if needed. You lose nothing by trying PNS first.

Replacement remains the gold standard for joints with severe structural deterioration — bone-on-bone arthritis, major deformity, or complete loss of function. In these cases, PNS may not provide sufficient relief because the underlying anatomy is too compromised.

The ARC approach doesn't oppose replacement. It sequences treatment so that less invasive options are explored first, and replacement is reserved for when it's clearly the most appropriate path.

ARC's philosophy is simple: preserve the natural joint whenever possible. PNS gives patients and physicians an intermediate step between conservative care (therapy, injections) and irreversible surgery. For many patients, that intermediate step is all that's needed.