The aim of this study was to examine the physical function criteria to support participation in sports activities in TKA patients 3 months after surgery.
The study design was a cross-sectional study. Inclusion criteria were patients who underwent primary TKA and had 3-month physical therapy follow-up. Exclusion criteria were those with revision surgery, a history of surgery on other joints, or a severe illness that made it difficult to participate in sports activities. Outcome measures included demographic data, preoperative Tegner Activity Score (TAS), participation in sports activities, maximal isometric quadriceps strength (Quad), Chair Stand 30 Second, timed UP & Go Test（TUG）, Star Excursion Balance Test forward reach (SEBT), and Four Square Step Test (FSST). The definition of sports activities participation was defined as participation in any sport activity except walking.
For statistical analysis, ROC curves were used to calculate cutoff values for the performance test. Univariate analysis was then used to extract significant cutoff values. Finally, multiple logistic regression analysis was performed using age, gender, BMI, and TAS as covariates.
The study included 76 subjects (72.1 ± 7.2 years, 63 women, BMI 25.5 ± 3.kg/m2). The number of participants in sports activities 3 months after TKA was 38. Univariate analysis showed that FSST (8.957 sec, Sen: 0.684, Spe: 0.579) was a significant cutoff value. Multiple logistic regression analysis also showed a significant association with FSST (OR: 3.43, 95% CI = 1.28-9.18). No significant associations were found in other performance tests.
The FSST cutoff may be a criterion to support participation in sports activities at 3 months after TKA. It was suggested that participation in Sports activities requires high balance and fast mobility.
FSST can be easily performed by physical therapists on TKA patients. It can therefore be used to support participation in sports activities.
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