The long-term outcome of the medial pivot knee arthroplasty system with minimum 25 years follow up

Long-term follow-up after total knee arthroplasty (TKA) is crucial to providing survivorship updates on available implants to guide patient expectations when undergoing this demanding procedure. Our group has previously shown the excellent long-term clinical and radiological results, using the ADVANCE® Medial Pivot (AMP) Knee System. In the present study, we further explore the continuing long-term outcomes of the aforementioned design and the patients' satisfaction after a postoperative period of minimum 25 years.

In a previous study we reported our results from 325 patients (347 knees) which were available for clinical and radiological assessment from an initial cohort of 350 consecutive patients (385 knees) operated between April 1998 and October 2000 with the AMP Knee System. We recently collected medical record data of 156 patients, (167 knees). Minimum follow-up was 25 years (up to 27).

At the 25-year follow-up, patients showed a mean range of motion of 115°, high satisfaction (68% excellent, 27% very good), and stable clinical and radiographic results. At the final follow-up a percentage of 10.7% of knees (18 cases) need a revision. The overall survival rate at final follow-up, with revision for any reason as the end point was 89.2%.

The AMP prosthesis demonstrated excellent long-term survivorship, sustained functional outcomes, and high patient satisfaction over a follow-up of up to 27 years. These findings support the durability and clinical effectiveness of this implant design in primary TKA, with low revision rates and stable radiographic results confirming its reliability in long-term use.