High preoperative range of motion is a significant risk factor for dislocation in primary total hip arthroplasty.

Dislocation after total hip arthroplasty (THA) is multifactorial and is dependent on surgical, implant, and patient factors. We hypothesized that high preoperative hip range of motion is an important variable contributing to instability after THA. We retrospectively reviewed 3379 THAs performed during a 21-year period.

Posterior capsular injections of ropivacaine during total knee arthroplasty: a randomized, double-blind, placebo-controlled study.

We investigated the hypothesis that a posterior capsular injection of ropivacaine would improve pain and accelerate functional recovery after total knee arthroplasty in a randomized, double-blind, placebo-controlled study design. Sixty-six patients received a standardized multimodal anesthesia protocol that included a femoral nerve block. Twenty milliliters of either saline (control) or ropivacaine (study group) was injected into the posterior capsule.