ISSN : 2146-3123
E-ISSN : 2146-3131

Treatment of Graf Type IIa Hip Dysplasia: A Cut-off Value for Decision Making
Fuat Bilgili1, Yavuz Sağlam2, Süleyman Bora Göksan1, Önder Murat Hürmeydan1, Fevzi Birişik1, Mehmet Demirel1
1Department of Orthopedics and Traumatology, İstanbul University İstanbul School of Medicine, İstanbul, Turkey
2Department of Orthopedics and Traumatology, Biruni University School of Medicine, İstanbul, Turkey
DOI : 10.4274/balkanmedj.2017.1150
Pages : 427-430


Background: The rate of spontaneous normalization in type IIa hips is reported to be high, whereas dysplsia persists or worsens in 5%-10% of cases.
Aims: To evaluate the natural course of type IIa hips using Graf’s own perspective of physiological immaturity and maturational deficit.
Study Design: A single center, retrospective cohort study.
Methods: This was an institutional review board-approved retrospective review of all patients diagnosed with type IIa hip dysplasia at a single institution from 2012 to 2014. All patients included in the study had hip ultrasonography at about 6 weeks and 3 months of age. To assess reliability in α and β angles, ultrasonography measurements were carried out on the same image individually by all observers. The α and β angles were used as the main outcome measurements to evaluate hip maturation at the last follow-up. A receiver operating characteristics curve was drawn at the 3 month ultrasonography to evaluate the cut-off values for α and β angles for persistent dysplasia.
Results: Sixty-four patients and 88 affected hips (63% unilateral and 37% bilateral) were included. The mean age at diagnosis was 6.4±2.7 weeks. Fifty-four hips were type IIa(+) (physiologically immature) and 34 hips were type IIa(-) (maturational deficit) at the initial ultrasonography evaluation. Improvement to type I was seen in 52 type IIa(+) and 17 type IIa(-) hips. Receiver operating characteristic analyses showed that patients do well if the α angle was >55° (area under the curve: 0.86; p<0.001 for the left hip and area under the curve: 0.72; p=0.008 for the right hip).
Conclusion: The cut-off α angle value of 55° on initial ultrasonography should be considered to prevent future dysplasia. An α angle <55° on the initial ultrasonography was an independent predictor of worsening sonographic findings.

Keywords : Decisioion making, Graf type IIa, Hip dysplasia, Ultrasonography
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