Postural stability computerized evaluation in total knee arthroplasty.

Purpose: To evaluate the balance in patients with total knee arthroplasty (TKA) and knee osteoarthrosis (KOA), measured by postural stability computerized evaluation (PSCE), and to evaluate the effect of post-TKA patients' characteristics in their performance on PSCE.
Materials and Methods: An observational cross-sectional study was conducted in two sets of patients: (A) patients with KOA and primary TKA surgery scheduled and (B) patients who underwent primary TKA >9 months. Sociodemographic, radiographic, clinical and PSCE parameters (using the Biodex Balance System) were assessed.
Results: Post-TKA patients placed more load on the replaced knee than the contralateral osteoarthritic knee ( p  = 0.027). They had less imbalance on the balance tests performed with the eyes open, on stable ( p  = 0.032), and unstable platforms ( p  = 0.022). These patients also showed better postural stability in monopodalic stance, both standing on the TKA ( p  = 0.010) and contralateral knee ( p  = 0.017). Age, weight, pain on the operated knee, extension deficit on the operated knee, and Berg Balance Scale scores on post-TKA patients were significantly associated with their performance on PSCE tests.
Conclusions: PSCE can be useful to quantify the balance of post-TKA and KOA patients.