Objective: To compare outcomes of 2 rehabilitation protocols on patellar tendinitis subjects. Design: Prospective, randomized, blinded, controlled clinical trial. Setting: Outpatient rehabilitation clinic. Subjects: Randomized into 2 rehabilitation groups-traditional (n = 10) and ASTM AdvantEDGE (n = 10). Main Outcome Measures: Clinical data and self-reported questionnaires collected at 0, 6, and 12 weeks. Results: On completion of the 6th week, 100% of the ASTM AdvantEDGE group and 60% of the traditional group had resolved. The unresolved subjects were crossed over to the ASTM AdvantEDGE for additional therapy. At the end of the additional therapy, 50% of the crossover subjects had resolved. The ASTM AdvantEDGE group's clinical outcomes and weekly journals indicated a statistically significant (P = .04) improvement in subjective pain and functional-impairment ratings. Conclusions: Findings suggest that ASTM AdvantEDGE resulted in improved clinical outcomes in treating patellar tendinitis.