Clinical application of hip joint bony roof ratio ultrasound measurement of the children under 6 months

TU Chang-yu; XUE Wen-yan

doi:10.3969/j.issn.2095-252X.2016.08.007

Abstract：Objective To evaluate the clinical signiifcance of hip joint bony roof ratio ultrasound measurement of the children.Methods From February 2011 to December 2015, 180 infant cases were studied. They were divided into 3 groups based on the size of Graf angle alpha. Group A, angle alpha 60°; Group B, angle alpha < 60° - 43°; Group C, angle alpha < 43°; 60 cases in each group. Each was measured by Graf, and then by bony roof ratio. Results of the 2 measures were analyzed.Results Group A: angle alpha 78.38° - 60.00° and the average was ( 66.43 ± 4.06 ) °; the bony roof ratio ranged from 3.71 to 1.06, the average was 1.70 ± 0.56. Group B: angle alpha < 60.00° - 43.00°, and the average was ( 51.24 ± 5.31 ) °; the bony roof ratio ranged from 1.20 to 0.56, and the average was 0.84 ± 0.15. Group C: angle alpha < 43.00° - 30.00°, and the average was ( 36.71 ± 6.36 ) °; the bony roof ratio ranged from 0.60 to -0.36, and the average was 0.16 ± 0.25. The bony roof ratio measurement divided the hip into 3 types: type I, type II, eccentric hip. Type I, bony roof ratio > 1.2; type II, bony roof ratio 1.2 - 0.6; Eccentric hip, bony roof ratio < 0.6. Conclusions The bony roof ratio and Graf measurements must be combined with hip morphology. Well-developed hip: big angle alpha, small angle β, big bony roof ratio; not-well-developed hip: small angle alpha, big angle β, small bony roof ratio. The bony roof ratio ultrasonic method: measurement point is clear, line drawing method is easy to be mastered, not affected by the morphology of the bony rim. It can be used as an auxiliary method of Graf measurement.