Now physiotherapy researchers have tackled this, by first identifying the available studies that examine CIMT versus no therapy. These show that CIMT does improve arm function and use in these children. However, the researchers then went back to the literature and identified all the studies that compared CIMT to the same amount of rehabilitation of the more affected arm, but where the good arm was not tied down. Interestingly, the amount of improvement was the same in both groups in these latter trials. This suggests that CIMT works by enforcing rehab time for the arm, but if the patient can be engaged in the same amount of arm rehab without constraint of the good arm, the same amount of benefit can still be expected.