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Randomized controlled trial of Protonics on patellar pain, position, and function
Timm KE
Medicine and Science in Sports and Exercise 1998 May;30(5):665-670
clinical trial
4/10 [Eligibility criteria: Yes; Random allocation: No; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

PURPOSE: Patellofemoral pain (PFP) and abnormal patellofemoral congruence (PFC) are common athletic problems whose treatment remains controversial. This study examined the effects of a high volume of submaximal knee muscle exercise on objective measures of PFP and PFC under a test-retest design. METHODS: A sample of 100 subjects was randomly divided into two groups: control and treatment. All subjects of both groups were tested for PFC, using a Merchant x-ray view, function, via Kujala patellofemoral score (KPS), and pain, through a visual analog scale (VAS), initially and then 4 wk later. The treatment group exercised during activities of daily living (ADL) by wearing a Protonics device; the control group did not receive treatment. RESULTS: One-way analysis of variance tests found no difference between pre- and post-test results for the control group but found significant changes in PFC, KPS, and VAS (all p < 0.001). PFC and joint function improved, and PFP decreased in all subjects of the treatment group. CONCLUSIONS/CLINICAL RELEVANCE: It was concluded that the treatment reduced PFP and PFC as compared with the control. A high volume of submaximal knee exercise seems useful for clinical patients with PFP and abnormal PFC.

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