The use of dynamic interventional MRI in developmental dysplasia of the hip

Conventional methods of imaging in the investigation of developmental dyspl asia of the hip all have disadvantages, either in definition or in exposure to radiation, We describe a new open-configuration MR scanner which is uni que in that it allows anaesthesia and access to the patient within the imag ing volume for surgical procedures and application of casts. We performed 1 3 scans in eight anaesthetised infants, Dynamic imaging revealed two disloc ated hips which were then visualised during reduction. Hip spicas were appl ied without removing the patient from the scanner. In one hip, an adductor tenotomy was carried out, In all patients, stressing the hips during dynami c imaging allowed an assessment of stability. This was particularly useful in two hips in which an analysis of stability in different positions facili tated the planning of femoral osteotomies, This method of imaging provides new and important information. It has great potential in the investigation of developmental dysplasia of the hip and, with ultrasound, may allow manag ement without the need for radiography.