Patient-Specific Instrumentation Improves Technical Execution Accuracy After Artificial Intelligence-Assisted Preoperative Planning in Medial Unicompartmental Knee Arthroplasty.

In 30 seconds

This prospective randomized clinical study evaluated whether patient-specific instrumentation (PSI) adds technical benefit to AI-assisted planning for medial unicompartmental knee arthroplasty. Among 48 patients, both groups received the same AI-assisted planning; one used PSI and the other conventional instruments. PSI improved tibial component positioning, tibial coverage, and accuracy of proximal tibial resection compared with conventional instrumentation (all P < 0.001). AI-based planning also predicted prosthesis size more accurately than conventional templating (P < 0.001). Short-term patient-reported outcomes did not differ significantly, so the clinical importance of the technical gains remains uncertain.

Key findings

• PSI improved tibial component positioning, tibial coverage, and proximal tibial resection accuracy versus conventional instrumentation (all P < 0.001).
• AI-based planning predicted prosthesis size more accurately than conventional templating (P < 0.001).
• The PSI group had a significantly longer skin incision (P < 0.001); other perioperative parameters did not differ significantly.
• Short-term OKS, VAS pain scores, and patient satisfaction showed no significant between-group differences.

Why it matters

The trial separates the contribution of PSI from that of AI-assisted planning by using the same planning workflow in both groups. Its findings suggest PSI can improve technical execution, while the absence of short-term differences in patient-reported outcomes cautions against assuming that greater positioning accuracy necessarily produces immediate clinical benefit.

What to keep in mind

The randomized clinical study included 48 patients, and follow-up was short-term; whether technical gains translate into durable clinical benefit remains uncertain.