Background Total knee arthroplasty (TKA) is a common surgical intervention that is performed with an aim to treat severe osteoarthritis (OA) of knee. Even though there is a rapid improvement in knee pain, functional improvement is limited in the following year after the surgery. Increased fall risk due to impairments in balance is one of the most common limitations after TKA. Therefore, balance and fall risk evaluation is an essential part of the assessment.
Objectives The aim of this study was to determine the validity and reliability of various performance tests that are used for evaluating balance and fall risk in patients with TKA.
Methods This study included 32 OA patients (27 F, 5 M) who undergone TKA surgery 6 months prior to the study. Mean age and BMI of the patients were 64±10,58 and 30,49±5,87, respectively. Participants performed the Timed Up and Go Test (TUG), 10 Meter Walk Test (10MWT), Single Leg Stance Test (SLST), Functional Reach Test (FRT), 2 Minute Walk Test (2MWT), Five Times Sit to Stand Test (5x SST) as performance tests. Each of the tests was performed twice, with a 1-day interval. ICC models were used to determine the test-retest reliability. Berg Balace Scale (BBS) was used as the reference standard to establish concurrent validity.
Results All tests showed good to excellent reliability (ICC >0.94) except SLST which showed moderate to good reliability (ICC=0.74). Three of the tests (SLST, 10 MWT, 5x SST) found to have good to excellent validity (r>0.75) and three (2 MWT, TUG, FRT) found to have moderate to good reliability (r>0.69). Results are presented in details at Table 1 and Table 2.
Conclusions TUG, 10MWT, SLST, FRT, 5x SST and 2 MWT are reliable and valid outcome measures, and could be used to assess balance and fall risk in patients with TKA. MDC scores presented in this study can be used to evaluate change in performance over time or effectiveness of interventions. 2 MWT and 5x SST were determined as the most reliable and valid methods among the investigated tests.
Disclosure of Interest None declared