39 patients with an injury to the fibular collateral ligament which required reconstruction were randomized to postoperative rehabilitation with either early partial weightbearing for the first 6 weeks after surgery, or complete nonweightbearing for the first 6 weeks after surgery. Primary outcome was varus stability of the knee on radiograph at 6 months postoperatively. Secondary outcomes included clinical scores, knee circumference, and knee range of motion. Equivalence testing demonstrated equivalent side-to-side difference in lateral compartment gapping for varus knee stability at 6 months between groups. Clinical scores and knee range of motion did not significantly differ between groups at 6 months.