Early outcomes of patient-specific posterior stabilized total knee arthroplasty implants

Abstract

Patient-specific implants have been linked to stiffness. The purpose of this study was to evaluate outcomes in patient-specific implants. We performed a retrospective review with a primary outcome of manipulation under anesthesia (MUA); secondary outcomes included Knee Society Scores (KSS), Knee Society Functional Scores (KSFS), range of motion (ROM), and Forgotten Joint Scores (FJS). Pre-operative measurements were similar in both groups. There was one MUA in the CPS and two in the OTS groups. There was no difference in postoperative scores. Our study suggests patient-specific implants have comparable rates of MUA and functional outcomes as conventional implants.

Keywords: Forgotten joint scores; Functional outcomes; Patient satisfaction; Patient-specific; Total knee arthroplasty.

Figures

Fig. 1

There was no significant difference in the pre-operative functional outcome scores between the patient-specific (CPS) and the off-the-shelf (OTS) groups. KSS- Knee Society Score; KSFS- Knee Society Functional Score; ROM-range of motion.

Fig. 2

Post-operative functional scores were obtained three months post-operatively and compared between the two groups. There was no significant difference in post-operative functional scores.

Fig. 3

The functional improvement was defined as the post-operative score minus the pre-operative score. Both groups demonstrated a substantial increase in their functional scores, however, there was no difference in the amount of post-operative functional improvement between the two groups.

Fig. 4

The Forgotten Joint Score (FJS) survey was completed by phone an average of 1.9 years post-operatively. There was no significant difference in the FJS between the two groups.