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P233 - High revision-rates but good clinical outcomes in not revised patients in 64 HemiCAPs in the knee, followed up to ten years.

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Abstract

Purpose

The aim of the study was to investigate the long-term outcomes of the Focal Femoral Condyle Resurfacing Prosthesis (HemiCAP) using clinical and radiographic assessments, and to evaluate the revision and survival rates.

Methods and Materials

Not-revised patients with HemiCAP were invited to participate. This was a prospective cohort study of HemiCAP patients with seven to ten years of clinical and radiographic follow-up. The clinical examination included KSS - and VAS - score. The radiographic examination included the Kellgren-Lawrence (KL) grade. A comparison analysis of the clinical preoperative and follow-up data and a Kaplan-Meier survival analysis were performed.

Results

Of the 62 patients with HemiCAP prostheses, 27 (42%) were revised and one died. Examinations were performed on 31 patients (86%). When compared with the preoperative data, there were significant increases in the KSS objective (mean=51.5, standard deviation (SD)=5.9 vs. mean=94.2, SD=5.0) and function (mean=51.0, SD=6.2 vs. mean=93.7, SD=4.8) scores, a decrease in the VAS score (mean=7.1, SD=0.7 vs. mean=2.7, SD=1.7) and a decrease in the KL lateral score (mean=1.1, SD=0.3 vs. mean=0.6, SD=0.6). The Kaplan-Meier survival rate after five years indicated good long-term outcomes.

Conclusion

The results showed a concerning revision rate of approximately 40% up to 10 years of follow-up. However, current implant procedures, such as the unicompartmental knee arthroplasty and total knee arthroplasty, are not appropriate for younger patients (35–65 years old), who are often left with pain and disability. For such patients, resurfacing femoral implants may offer temporary or, potentially, long-term treatment and improvements in disability and function.

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