Screening for congenital dislocation of the hip: an economic appraisal.
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The hereditary pattern of CDH is well known, but the results depend on time of diagnosis, either late or in the immediate postnatal period, the latter having been the basis of the more recent studies. Early screening shows that newborns with an unstable hip are 4 times more frequent than those with late CDH. The etiology includes constitutional and environment factors. This is well demonstrated in twins. In a large series of Idelberger the concordance was 41.4% (12/29) in identical twins in cases of late CDH whereas in fraternal twins, the concordance was 2.8% (3/109). Fraternal twins have the same genetic differences as other siblings. There is also a sexual factor. In Western Europe, the frequency of unstable hips varies between 3 and 5/1000 (except in some specific areas) with 3 to 8 times more cases in girls than in boys, depending on the study and on the period of diagnosis.
Open reduction will be indicated in three circumstances: failure to correct the soft tissue contracture; failure of the hip to reduce concentrically following a "Trial of Closed Reduction"; and when closed reduction is contra-indicated in a child over two and a half years or with an associated condition such as Arthrogryposis Multiplex Congenita.
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A series of 42 hips in children aging 5 to 26 months treated initially by the Ferguson's technique is reported. The mean duration of the follow-up was 41 months. The place of this therapeutic method in the general plan of treatment of CDH was evaluated. The reduction of the femoral head was obtained in 93 p. cent of the cases, but with a lateralized position of the epiphysis postoperatively in one third of the cases. This excentration improved and the centering of the epiphysis was obtained spontaneously during the postoperative immobilization. One case of redislocation reduces the rate of success to 90.5 p. cent. An hypertrophy of the ossified nucleus of the femoral head was noted in 23 p. cent of the cases. This aspect is probably more frequent than reported when considering the bilateral cases, and must be considered as a complication of the arthrotomy. An ischemic necrosis of the femoral epiphysis complicated the operation in 5 cases (12 p. cent) causing in 4 cases an epiphyseal involvement (type 1 of Bucholz and Ogden). There has been 3 failures in obtaining the reduction peroperatively: these 3 hips have been treated subsequently by a conservative means in 2 hips and surgical reduction through an anterior approach in one hip. Two pelvic osteotomies have been necessary to treat a severe pelvic dysplasia that did not correct spontaneously. We think that this operation has a definite place among the methods of treatment of CDH. It should be indicated only in cases of failures of a conservative treatment.
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A prospective study involving 62 newborns diagnosed as having subluxable or dislocatable hips has established the efficacy of treating such cases from birth. Patients were treated first with a simple abduction splint, leading from a plastic abduction brace to the Pavlik harness and finally, a hip spica. Routine clinical examination showed this to be necessary until hip stability was achieved. This approach, together with continuing, detailed, clinical examinations, produced a 100% success rate with no iatrogenic complications.
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This article represents an evaluation and treatment program of CDH in infants. A practical approach describing current trends in diagnostic techniques and treatment modalities are presented for the orthopedist in his office practice.
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