Abstract
Purpose
This study aimed to compare the clinical and radiographic outcomes of patients with positive patch tests undergoing a medial mobile-bearing titanium–niobium nitride (TiNbN) unicompartmental knee arthroplasty (UKA) to patients undergoing standard UKA (cobalt–chromium [CoCr] implants).
Methods
Two successive groups of patients, amounting to a total of 246 individuals, who received Oxford (Zimmer-Biomet, Warsaw, Indiana, USA) UKA were included. The first group was composed of a series of 203 consecutive standard CoCr UKAs (Standard Group), while the second group comprised 43 consecutive hypoallergenic TiNbN UKAs (HA group). The patients of the second group had a positive epicutaneous patch test result for metals. Each patient was evaluated using the Oxford Knee Score (OKS) and Knee Society Score (KSS) a day prior to the surgery (T0) and at two consecutive follow-ups, namely T1 (minimum follow-up of 12 months) and T2 (minimum follow-up of 34 months). Radiographic measurements were performed at the final follow-up (T2).
Results
No statistical differences were noted between the two groups regarding demographic data (p > 0.05). No clinical or radiographic differences were found between the HA and standard groups at any follow-up (p > 0.05). A statistically significant improvement was found at any follow-up for both OKS and KSS (p < 0.05).
Conclusions
No clinical or radiographic differences between the hypoallergenic and standard cobalt–chromium groups at any follow-up were found, with a clinically significant improvement being experienced by both groups during the entire follow-up.
Level of evidence
Level II—comparative prospective study.
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Availability of data and materials
Raw data have been submitted as supplementary material to the Journal.
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RD’A: writing, data analysis, patients evaluation, surgery, and final revision. RL: data analysis, writing, and statistical analysis. ML: data analysis, writing, and statistical analysis. RG: writing, data analysis, and revision. NU: surgery and final revision. GMP: final revision.
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D’Ambrosi, R., Loucas, R., Loucas, M. et al. No Clinical or Radiographic Differences Between Cemented Cobalt–Chromium and Titanium–Niobium Nitride Mobile-Bearing Unicompartmental Knee Arthroplasty. JOIO 55, 1195–1201 (2021). https://doi.org/10.1007/s43465-021-00486-3
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DOI: https://doi.org/10.1007/s43465-021-00486-3