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The University of Southampton
Southampton Clinical Trials Unit

Hip 'Op Trial

Trial Name:

HipOp - Timing of surgical intervention for Developmental Dysplasia of the Hip. 


A randomised controlled study to assess the effect of timing of surgical intervention on the occurrence of Avascular Necrosis (AVN) in children with Developmental Dysplasia of the Hip - Early Treatment versus Intentionally Delayed Treatment.


Primary Objective:

Secondary Objectives:


Phase III randomised controlled trial




A total of 636 children aged 3-13 months with a dislocated hip in the absence of the proximal femoral ossific nucleus will be recruited (318 each arm). They will be stratified at randomisation by failed splintage and age at diagnosis (≤10 months or >10 months).


Timing of surgical Intervention for developmental dysplasia of the hip: a randomised controlled trial (Hip ‘Op)

Contact Detials:

All Trial enquiries should be addressed to

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