OBJECTIVE: To compare the effectiveness of proprioceptive neuromuscular facilitation combined with exercise, classic stretching physiotherapy intervention, and educational intervention at improving patient function and pain in patients with patellofemoral pain syndrome. DESIGN: Randomized, controlled, blind trial over four months. SETTING: Urban population, Spain. PARTICIPANTS: Patients undergoing primary care for retropatellar pain. INTERVENTION: Subjects were allocated on three different treatment options: a proprioceptive neuromuscular facilitation and aerobic exercise group, a classic stretching group, and a control treatment were applied over four months under the supervision of a physiotherapist. MAIN OUTCOME: Knee Society Score, pain reported (visual analogue scale) and knee range of motion. Assessments were completed at baseline and after four months. RESULTS: 74 patients were enrolled in the study and distributed between groups. Both the proprioceptive neuromuscular facilitation and classic stretching group showed significant changes in all variables after four months intervention (p < 0.001). The difference in mean Kujala knee score changes between groups (classic stretching group versus proprioceptive neuromuscular facilitation group versus control group) at four months was -24.05 (95% confidence interval (CI) -30.19 to -17.90), p <= 0.001; versus -39.03 (95% confidence interval (CI) -42.5 to -35.5), p <= 0.001; versus -0.238 (95% confidence interval (CI) -1.2 to 0.726), p = 0.621, respectively. CONCLUSIONS: A proprioceptive neuromuscular facilitation intervention protocol combined with aerobic exercise showed a better outcome than a classic stretching protocol after four months.

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