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The effects of soft tissue procedures for internal hip rotation in cerebral palsy

levels and whether they improved or declined during the 2 years. Could this have influenced results? In other words, is the sample large enough to find differences if they indeed exist? Some children no doubt received treatment within the 2-year period of this study. Could two groups be identified (therapy vs no therapy) and compared, so that preliminary results would allow the investigators to decide whether treatment puts children in a higher level of function and whether this question should be pursued in a future study? In conclusion, what have we gained from multicenter studies? They have increased sample sizes that could not have been achieved in one center in the past, due to low prevalence and high variability of the condition. They have permitted multiple questions to be addressed, thanks to greater statistical power inherent in large samples. They have shortened the duration of data collection, keeping costs within achievable and fundable limits, and shown that clinically relevant questions engaged families to participate in the study; thus, ensuring the description of a child’s usual function rather than a less frequent best function. (The EDACS is not yet included in the current study but should be in future studies).