Evaluation of reduction quality with MRI after closed or open reduction of the hip in the treatment of developmental dysplasia of the hip

Background :   Study analyses the usefulness of Magnetic resonance imaging (MRI) after closed or open reduction in this indication. Material and Methods : We prospectively reviewed 20 consecutive MRI studies performed without sedation after spica cast placement in 16 developmental hip dysplasia patients.  MRI evaluation was carried out within 24 hours after cast application.  Both coronal and axial sequences are used to determine wheter the femoral head is concentrically reduced, subluxed or frankly dislocated. Results : In two cases, the quality of radiographs was noted as being poor and responsible for difficulties in assessing the concentric reduction of the hip.  MRI examination confirmed subluxation of the hip on coronal and axial images  in this patients. Conclusions: Especially in the hips that the femoral head unossified and there is a suspicion of reduction quality, MRI is  a safe and reliable  imaging modality. Keyword :Hip dysplasia,Spica MRI,Open reduction,Closed reduction