Repeatability and limits of agreement in measurement of hip migration percentage in children with bilateral cerebral palsy
Pountney, TE, Mandy, A. and Gard, P.R. (2003) Repeatability and limits of agreement in measurement of hip migration percentage in children with bilateral cerebral palsy Physiotherapy, 89 (5). pp. 276-281. ISSN 0031-9406
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Official URL: http://dx.doi.org/10.1016/S0031-9406(05)60039-9
Objective: To determine the repeatability and limits of agreement for X-ray measurement of hip migration percentage in children with cerebral palsy. Design: An inter-rater and intra-rater study. Data: Twenty hip and pelvic X-rays (40 hips) were measured by three health professionals on two separate occasions. Results: Repeatability of the measure was expressed as 95% limits of agreement. Measurements of hip migration were within 7.6% of each other when measured by the same rater on two occasions. When two raters were compared, measurements were within 8.1% of each other. Conclusion: Measurement of hip and pelvic X-rays can be made using the described method within limits of agreement that are acceptable for clinical decision-making. The information thus obtained on the degree and rate of hip subluxation/dislocation can be used to inform therapy and surgical decision-making.
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