Logistic Regression Model of Roposch et al for the Diagnosis of Developmental Dysplasia of the Hip (DDH)

Description

Roposch et al developed a model for identifying an infant who may have developmental dysplasia of the hip. This can help to identify a patient who should be targeted for additional diagnostic testing. The authors are from University College London and Great Ormond Street Hospital for Children in London.

Parameters:

(1) Ortolani or Barlow test

(2) limitation on abduction (asymmetry in abduction >= 20 degrees, abduction of one or both hips <= 45 degrees)

(3) leg length discrepancy (Galeazzi sign)

(4) family history of developmental dysplasia of the hip (first degree relative)

Parameter	Finding	Points
Ortolani or Barlow test	negative	0
	positive	3.26
limitation on abduction	absent	0
	present	1.48
leg length discrepancy	absent	0
	present	0.74
family history	absent	0
	present	1.39

X =

= SUM(points for the 4 parameters) - 2.35

probability of DDH =

= 1 / (1 + EXP((-1) * X))

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Description

Specialty

ICD-10