Osteogenesis imperfecta: fractures of the femur when testing for congenital dislocation of the hip.
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A study of the automated diagnosis of luxatio coxae congenita (LCC) was performed to establish an automated screening system for hip radiographs. A specific parameter with high diagnostic accuracy was selected by the use of information theory. Pattern recognition programs were written to extract the parameter from digitized hip radiographs. Parameter measurement was performed on 10 radiographs and compared with manual measurements. Results showed good agreement with measurements obtained by specialists. This study confirms the possibilities of automated diagnosis of LCC.
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The Denis Browne abduction harness was used in the management of 127 abnormal hips in 104 children at Queen Mary's Hospital for Children from 1966 to 1980, both as the initial treatment for unstable hips recognised soon after birth, and for children presenting later and whose hips first required reduction by gradual abduction in traction. The incidence of significant avascular necrosis was 3.1%, and occurred only in the primary treatment group, emphasising again the need for gentle care of infant hips. There have been no other significant complications and the appliance has functioned well.
A study of structures which obstruct reduction of hip dislocation was performed on 15 hips by magnetic resonance imaging (MRI). Before treatment started, MRI studies were performed on 10 patients, six of whom were treated conservatively, after which further MRI studies helped to establish a concentric reduction. In the other four conservative treatment failed and they were operated on; in them the MRI studies were compared with arthrographic and surgical findings. In all but one of these 10 patients, MRI enabled us to differentiate between an everted and an inverted limbus. In five other patients with unsatisfactory development of the hip following closed reduction, MRI was compared with earlier arthrographic studies. MRI provided accurate anatomical information which would not have been obtained by arthrography. It clearly has great potential in assisting the surgeon to select the appropriate form of treatment.
Of a consecutive series of 117 one-year-old infants with 130 established dislocations of the hip, 11% failed to respond to primary surgical treatment. Genetic and iatrogenic factors accounted for half the failures. There were no obvious causes in the remainder, though a few had the superficial stigmata of spinal dysraphism, and by two years of age, most of the group had developed a lateral rotation posture of the affected leg associated with a relatively smaller foot on that side. Radiologically, the femoral head had drifted and rotated laterally out of the surgically deepened acetabulum, causing persistent subluxation. Although there was no clinical evidence of sensory or motor denervation, sensory spinal evoked potential tests revealed the presence of neurological deficits in the majority of patients in this group.
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