Popliteal angle as an indicator for successful closed reduction of developmental dysplasia of the hip.
Affiliation
Department of Orthopaedic Surgery, Mid Western Regional Orthopaedic Hospital, Croom, Limerick, Ireland.Issue Date
2011-04MeSH
AcetabulumArthrography
Casts, Surgical
Follow-Up Studies
Hip Dislocation, Congenital
Hip Joint
Humans
Infant
Orthopedic Procedures
Range of Motion, ArticularRetrospective StudiesTreatment Outcome
Metadata
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Popliteal angle as an indicator for successful closed reduction of developmental dysplasia of the hip. 2011, 19 (1):46-9 J Orthop Surg (Hong Kong)Journal
Journal of orthopaedic surgery (Hong Kong)PubMed ID
21519075Abstract
To evaluate the use of the popliteal angle as an indicator for successful closed reduction of developmental dysplasia of the hip (DDH) in children with delayed presentation.29 patients aged 6 to 18 months underwent successful closed reduction for unilateral DDH under general anaesthesia. Using a graduated goniometer, the popliteal angle was measured with the hip abducted within the safe zone (to avoid redislocation and injury to the femoral capital epiphysis) before and after reduction and after 6 weeks of spica casting.
The mean popliteal angles before and after reduction and after 6 weeks of spica casting were 5.1, 37.5, and 17.9 degrees, respectively (p<0.0001, paired t test). Because of discomfort, the spica casts were altered in 3 patients (2 at week 1 and one at week 3).
Reduction of the hip in DDH results in an increased popliteal angle of >20 degree. This may be used to indicate the diagnosis and safe closed reduction.