OBJECTIVES: (1) Assess medial collateral ligament (MCL) laxity differences in nonoperatively treated acute MCL and anterior cruciate ligament (ACL)-MCL injuries with 2 range of motion (ROM) knee brace settings. (2) Describe knee ROM, brace satisfaction, overall knee score, adherence, pain, quality of life, and knee function. (3) Assess feasibility of larger trial. DESIGN: Prospective, randomized, single-blinded feasibility clinical trial. PARTICIPANTS: Sixty-four adults with acute moderate-to-severe isolated MCL or combined ACL-MCL injuries at the University of Calgary Sport Medicine Centre. INTERVENTION: Random assignment to the protected (0 to 90 degrees) or restricted (30 to 90 degrees) brace group. Four weeks of constant brace wearing, followed by daytime wear until 6 weeks. Rehabilitation exercises prescribed from 2 weeks onward. Follow-up for 12 weeks. MAIN OUTCOME MEASURES: Clinical outcomes included side-to-side difference (SSD) MCL laxity (mm) at 30 degrees knee flexion and 0 degree, ROM, patient-reported pain, overall knee ratings, brace satisfaction, daily adherence, international knee documentation committee subjective, and ACL-quality of life (QOL) collected throughout 12 weeks (baseline, 2, 4, 6, 8, and 12 weeks). The outcome assessor was masked to treatment group allocation. RESULTS: At 12 weeks, 73% had < 1 mm SSD valgus laxity at 30 degrees knee flexion, with 82% in the restricted group and 67% in the protected group. All patients reported improved pain; none suffered a loss of knee ROM by 12 weeks. The 30 to 90 degrees brace group trended toward better adherence, satisfaction, function, overall knee scores, and QOL. A larger RCT would be feasible but challenging because of sample size needs and slow recruitment. CONCLUSIONS: Favorable outcomes for bracing moderate-to-severe MCL injuries at 30 to 90 degrees for 6 weeks were observed in this feasibility trial.
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