DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS

F. Poletti; R. Naskar; N. Bhamber; S. O´Leary

doi:10.1302/1358-992X.2022.7.004

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DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS

The British Association for Surgery of the Knee (BASK) May 2022 Meeting, Newport, Wales, 17–18 May 2022.

F. Poletti
R. Naskar
N. Bhamber
S. O´Leary

DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS

Poletti F, Naskar R, Bhamber N, O´Leary S. DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS. Orthop Procs. 2022;104-B(SUPP_7):4-4. doi:10.1302/1358-992X.2022.7.004

Poletti, F., et al. “DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS.” Orthopaedic Proceedings, vol. 104-B, no. SUPP_7, 2022, pp. 4-4., https://doi.org/10.1302/1358-992X.2022.7.004

Poletti, F., Naskar, R., Bhamber, N., & O´Leary, S. (2022). DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS. Orthopaedic Proceedings, 104-B(SUPP_7), 4-4. https://doi.org/10.1302/1358-992X.2022.7.004

Poletti, F., Naskar, R., Bhamber, N. and O´Leary, S. (2022) “DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS.” Orthopaedic Proceedings, 104-B(SUPP_7), pp. 4-4. Available at: https://doi.org/10.1302/1358-992X.2022.7.004

Poletti, F., R. Naskar, N. Bhamber, and S. O´Leary. “DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS.” Orthopaedic Proceedings 104-B, no. SUPP_7 (2022): 4-4. https://doi.org/10.1302/1358-992X.2022.7.004

Poletti F, Naskar R, Bhamber N, O´Leary S. DEBUNKING THE MYTH: ALL-POLYETHYLENE TIBIA MEDIAL FIXED BEARING UNICOMPARTIMENTAL KNEE ARTHROPLASTY SHOWS EXCELLENT TEN-YEAR SURVIVAL RATE AND IS NOT AFFECTED BY AGE, BMI, ASA GRADE, OR IMPLANT THICKNESS. Orthop Procs. 2022 Jul 1;104-B(SUPP_7):4-4. https://doi.org/10.1302/1358-992X.2022.7.004

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Abstract

Introduction

Medial fix bearing unicompartmental knee replacement (UKR) designs are consider safe and effective implants with many registries data and big cohort series showing excellent survivorship and clinical outcome comparable to that reported for the most expensive and surgically challenging medial UKR mobile bearing designs. However, whether all polyethylene tibial components (all-poly) provided comparable results to metal-backed modular components during medial fix bearing UKR remains unclear. There have been previous suggestions that all-poly tibia UKR implants might show unacceptable higher rates of early failure due to tibial component early loosening especially in high body max index (BMI) patients. This study aims to find out the short and long-term survival rate of all-poly tibia UKR and its relationship with implant thickness and patient demographics including sex, age, ASA and BMI.

Material and Methods

we present the results of a series of 388 medial fixed bearing all-polly tibia UKR done in our institution by a single surgeon between 2007–2019.

Results

We found out excellent implant survival with this all-poly tibia UKR design with 5 years survival rate: 96.42%, 7 years survival rate: 95.33%, and 10 years survival rate: 91.87%. Only 1.28% had early revision within 2 years.

Conclusion

Fixed bearing medial all-poly tibia UKR shows excellent survivor rate at 2, 5, 7 and 10 years follow up and the survival rate is not related with sex, age, BMI, ASA grade or implant thickness. Contrary to the popular belief, we found out that only 1.71% of all implants was revised due to implant loosening.