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General Orthopaedics

UNICOMPARTMENTAL KNEE REPLACEMENT WITH AN ALL-POLY TIBIAL COMPONENT: SATISFACTORY TEN-YEAR IMPLANT SURVIVORSHIP REGARDLESS OF BMI

The International Society for Technology in Arthroplasty (ISTA), 27th Annual Congress. PART 1.



Abstract

BACKGROUND

Some papers recently reported conflicting results on implant survivorship in all-poly tibial UKRs. Furthermore, the influence of BMI on this specific implant survivorship remains unclear, since existing reports are often based on small series of non-consecutive patients with different follow up durations, enabling to generate meaningful conclusions.

PURPOSE

To determine the 10-years survival rate of an all-poly tibial UKR in a large series of consecutive patients and to investigate whether a correlation exists between a higher BMI and an increased risk of revision for any reason.

METHODS

A retrospective evaluation of 273 patients at 6 to 13 years of follow-up was performed. Clinical evaluation was based on KSS and WOMAC scores. Subjective evaluation was based on a VAS for pain self-assessment. Radiographic evaluation was performed by 3 independent observers. A Kaplan-Meier survival analysis was performed assuming revision for any reason as primary endpoint. Reason of revision was determined basing on clinical and radiographic data.

RESULTS

The 10-years implant survivorship was 90.8%. Twenty-five revisions (9.2%) were performed and aseptic loosening of the tibial component was the most common failure mode (11 cases, 4%). No significant correlation was identified between failure and patients'BMI. Mean post-operative results for KSS and WOMAC score were 87.0 (st.dev. 14.6) and 87.37 (st.dev. 11.48), respectively. VAS showed a significant improvement (p<0.0001) respect to pre-operative condition.

CONCLUSIONS

Unlike some recent reports, this study demonstrated a satisfactory 10-years implant survivorship using an all-poly tibial UKR. A higher BMI does not reduce survival rate at 6 to 13 years of follow-up.


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