Abstract
BackgroundThe primary purpose of the present prospective study was to consecutively analyse the outcomes of the return to sports activity of patients with positive patch tests undergoing a medial mobile-bearing titanium niobium nitride (TiNbN) unicompartmental knee arthroplasty (UKA). The secondary purpose was to ascertain if a higher grade of physical activity leads to a reduction in the body mass index (BMI) of the patients.Material and methodsForty-one patients with positive skin patch tests were included in this prospective study. The clinical evaluation consisted of the University of California, Los Angeles (UCLA) activity scale and the High-Activity Arthroplasty Score (HAAS). Each patient was evaluated the day before surgery (T0), after 12.37 ± 0.70 months (T1), and on the day of the final follow-up, after 67.03 ± 18.2 months (T2). Furthermore, the BMI of each patient was analysed before surgery and during the final follow-up.ResultsThe UCLA and HAAS mean preoperative values ranged from 3.68 ± 1.1.7 and 6.15 ± 0.76 to 6.1 ± 0.76 and 10.34 ± 1.3, respectively, at T1 (p < 0.0001) and to the final values of 6.34 ± 0.62 and 11.0 ± 8.9, respectively, at T2 (UCLA: T2 versus T1: p = 0.132; T2 versus T0: p < 0.0001; HAAS: T2 versus T1: p = 0.0027; T2 versus T0: p < 0.001). BMI ranged from a preoperative value of 27.97 ± 3.63 to a final value of 26.84 ± 3.11 (p < 0.0001). The only differences within the subgroups concerned patients with BMI ≥ 28, showing a superior HAAS at each follow-up (p < 0.05). A positive correlation was found between BMI and HAAS at T0 and T2 (p < 0.05).ConclusionsThis is the first study to evaluate the rate of the return to sports activities and change in BMI following hypoallergenic UKA. The majority of patients reduced their weight following UKA and improved their physical activity, showing outcomes that were comparable to the standard cobalt–chrome (CoCr) prostheses, regardless of gender, age, BMI and implant size.Level of evidenceIV – Prospective Cohort Study.Trial registration researchregistry5978—Research Registry www.researchregistry.com
Highlights
In the past two decades, a renewed interest was noted in unicompartmental knee arthroplasty (UKA) for the treatment of isolated knee arthritis, especially in youngD’Ambrosi et al J Orthop Traumatol (2021) 22:36 and active patients [1]
body mass index (BMI) ranged from a preoperative value of 27.97 ± 3.63 to a final value of 26.84 ± 3.11 (p < 0.0001)
This is the first study to evaluate the rate of the return to sports activities and change in BMI following hypoallergenic UKA
Summary
In the past two decades, a renewed interest was noted in unicompartmental knee arthroplasty (UKA) for the treatment of isolated knee arthritis, especially in youngD’Ambrosi et al J Orthop Traumatol (2021) 22:36 and active patients [1]. In view of the considerable increase in the use of UKA, prostheses of hypoallergenic materials have been developed These materials provide an excellent alternative to the standard cobalt– chrome (CoCr), especially in patients who have metal hypersensitivity, one of the most controversial issues as a cause of premature failure in knee arthroplasty [9, 10]. The primary purpose of the present prospective study is to consecutively analyse the outcomes of the return to sports activity in patients with positive patch tests undergoing a medial mobile-bearing TiNbN UKA during their mid-term follow-ups. The primary purpose of the present prospective study was to consecutively analyse the outcomes of the return to sports activity of patients with positive patch tests undergoing a medial mobile-bearing titanium niobium nitride (TiNbN) unicompartmental knee arthroplasty (UKA). The secondary purpose was to ascertain if a higher grade of physical activity leads to a reduction in the body mass index (BMI) of the patients
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