Functional and postural recovery after bilateral or unilateral total hip arthroplasty.

One-stage bilateral total hip arthroplasty (THA) implies similar complication rate and hospitalization time to unilateral THA, but no studies have evaluated the functional and postural recovery in these patients. The aim of this study was to assess short-term functional and postural recovery in patients after one-stage bilateral or unilateral THA. Forty patients undergoing bilateral (n = 20) or unilateral (n = 20) THA were assessed by Timed Up and Go (TUG), Numeric Rating Scale (NRS), Tampa Scale of Kinesiophobia (TSK) and Body Weight Distribution Symmetry Index (BWDSI) during stand-to-sit (STS). Centre of Pressure (CoP) parameters and BWDSI during standing with eyes open (EO) and closed (EC) were also assessed. Data were collected one day before surgery, at three and seven days. No between-group differences were found for TUG, NRS and TSK at any time-point, showing similar mobility, pain and fear of movement in both groups. BWDSI during STS (P = 0.001) and standing (OE P = 0.007; CE P = 0.012) revealed differences over time in favor of patients with bilateral THA, who showed better symmetry in weight distribution. Shorter CoP path length was observed during standing in patients with unilateral THA (OE P = 0.023; CE P = 0.018), who mainly used their non-affected limb to maintain balance.