BACKGROUND:: @entity4222 ( @entity4222 ) is an accepted method of assessing lateral displacement of the femoral head in @entity1 with @entity306 ( @entity306 ). Difficulty in positioning of @entity1 for pelvic radiography remains a concern for the reliability of the @entity4222 . METHODS:: This 2-part quantitative study examined 100 anteroposterior pelvic radiographs for @entity1 with @entity306 . Fifty were from a region that had a positioning protocol for hip surveillance of @entity1 with @entity306 and 50 images were from a region without. Images were assessed for acceptability of position in relation to hip abduction/adduction and/or pelvic rotation.Ten images deemed Acceptable or Borderline from the region with no protocol were then randomly selected. @entity4222 was measured on 2 separate occasions by 5 @entity1 's orthopaedic surgeons and statistically analyzed for intrarater and interrater reliability. RESULTS:: There was no statistically significant difference in the acceptability of images between the 2 regions with 60% to 66% of the images meeting the criteria outright. When allowances were made for slight variation of abduction/adduction within 5 degrees, 74% to 80% of the images were acceptable.Reliability was variable with limits of agreement between 4.96% and 15.15%. Observers more familiar with the software measuring package had higher reliability within and between occasions. Variability within and between observers decreased as @entity4222 increased. CONCLUSIONS:: Poor positioning did not appear to be the main reason for the variation in reliability of @entity4222 . Repeat measurements were reliable although standardized technique, training, and familiarity with software measuring programmes did influence outcomes. LEVEL OF EVIDENCE:: This is a level 1 diagnostic study divided into 2 parts. The first half is a retrospective study of pelvic radiographs of @entity1 with @entity306 as part of their annual/biannual orthopaedic assessment. The second half is an interrater and intrarater reliability study of @entity4222 measurement.

How Critical is @entity1 Positioning in Radiographic Assessment of the Hip in XXXX When Measuring Migration Percentage?

@entity4222 :: ('MESH:D014085', 'Disease') :: ['MP', 'Migration percentage'] @entity1 :: ('9606', 'Species') :: ['children', 'patients'] @entity306 :: ('MESH:D002547', 'Disease') :: ['cerebral palsy', 'CP']
@entity306 :: (MESH:D002547,Disease) :: ['Cerebral Palsy']
