The purpose of this study was to evaluate the treatment effectiveness of CPM machine during post-operative treatment of ACL patients. It was hypothesized (H0) that there is no significance difference on muscles activities between experimental period (during movement) with CPM machine and control period (during resting) before treatment with CPM machine. The data analysis compared the following variables for 11 patients who received CPM machine for 30 min conducted as an experimental period and during the first minute before treatment with CPM machine, performed as a control period or baseline. In this cross sectional study, 11 patient male military personnel who fulfilled the inclusion criteria was chosen specifically based on simple random sampling method. Muscles activities in the rectus femoris (RF) and bicep femoris (BF) were assessed by surface electromyography during treatment with CPM machine. Based on the result of this study, showed that the null hypothesis (H0) of this research was accepted because at the 5% level of significance, the evidence is sufficient to conclude that rectus femoris and biceps femoris muscles is not activated compared during resting and during movement with CPM machine. Therefore, the treatment effectiveness of CPM machine was assessed completely in the way to provide evidence concerning muscle is relaxed during treatment session.
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