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Congenital hip dysplasia in the light of early and very early diagnosis.

Ortolani summarizes 40 years of experience with about 8,000 children with congenital hip dysplasia, treated from birth or at a very early age. All newborns should be screened and examined for congenital hip dysplasia and this exam should be repeated at one month and again in 3 months. The most reliable sign for the diagnosis of congenital hip dysplasia at birth is the "click" sign. The etiology of congenital hip dysplasia is in a localized fault in embryonic development. The treatment started just as early as the condition was suspected. Surgical treatment is recommended for all complete congenital hip dislocations not amenable to treatment by closed methods.

Gestational Age↗

[Why and how to examine the newborns' hips?].

The authors insist on the importance of a careful clinical examination of newborn's hips, and on the necessity of an early diagnosis of congenital hip dislocation, in order to optimize the probability of therapeutic success. They don't consider hip dislocations resulting from neuromuscular diseases or from complex malformations (e.g. arthrogryposis) included in a wider context with very different prognosis and treatment.

Decision Trees↗

[Frequency of necroses of the head of the femur in the treatment of the so-called congenital dislocation of the hip joint according to Hoffmann-Daimler (author's transl)].

The article reports on the results which can be obtained with the method described by Hoffmann-Daimler regarding the functional treatment of the so-called congenital dislocation of the hip joint. The report is based on a patient material of 110 children with 159 dislocated hips treated at the Orthopaedic University Clinic at Erlangen between 1971 and 1976. Observation of the course of the disease revealed a much lower rate of incidence of necrosis of the head of the femur than stated in literature, using the Hoffmann-Daimler method. The incidence of necrosis on pre-treatment of most children with other therapeutic methods, was 2.3% at the beginning of the Hoffmann-Daimler treatment, and increased to 12.7% up to the end of the treatment, dropping to 9.3% at the time of the follow-up examination.

Child, Preschool↗

[Salter innominate osteotomy for the treatment of congenital dislocation of the hip].

Thirty-one children (43 hips) were reviewed after having sustained a Salter innominate osteotomy. The average follow up was 10 years. The indication for the osteotomy was a persisting dysplasia after conservative treatment of congenital dislocation of the hip. The X rays study allowed to describe the importance of the remodeling of the femoral head. The overall results were satisfactory in 60 per cent of the cases. The age of the patient at the time of surgery was important: the results being much better in children under 5 years of age. The failures were mostly related to technical faults. However some failures could not be predicted.

Child↗

The pathogenesis of femoral head deformity in congenital dislocation of the hip. Experimental study of the effects of articular interpositions in pigs.

An experimental study was conducted based on the hypothesis that articular interpositions such as inverted limbi are major factors influencing deformities of the femoral head and neck that complicate treatment of congenital dislocation of the hip. In 24 neonatal pigs, the hip was fixed in a cast for one to three hours in the frog-leg position after insertion of an allogeneic meniscus into the hip joint. No macroscopic changes were observed immediately and one day after the above procedure, but electron microscopy showed degeneration of the cells in the physis. After 29-39 days, varus deformity and flattening of the femoral head were observed in all animals. After five months, marked deformity of the femoral head and replacement of the physis by fibrous tissue were noted. Angiograms obtained during cast fixation and 30 minutes after removal of the cast showed no circulatory occlusion. A short period of immobilization in the frog-leg position combined with articular interposition plays a major role in degeneration of the physis and predisposes to deformities of the femoral head and neck.

Animals↗

The importance of the acetabular rim in the genesis of congenital hip dysplasia. Experimental research.

The posterior aspect of the cartilaginous acetabular rim was surgically removed in very young rabbits in order to study its effect on the further development of the acetabular cavity. A dysplasic change was produced which led to posterior hip dislocation. Through an analysis of the morphological, radiographic and histological findings, and comparison with human congenital hip dislocation, the acetabular rim is considered to be physiologically responsible for the development of the retaining properties of the acetabular cavity. Moreover, a genetic abnormality altering the physiological development of the cartilaginous acetabular rim, is responsible for the non-retaining power of the acetabulum which leads to congenital hip dislocation.

Acetabulum↗

Pediatric update #9. Revision surgery in congenital dislocation of the hip.

Of 759 dislocated hips operated on in our department, 667 received their primary treatment in our hands, while 92 were revised by us after failure of primary surgery. In 71 hips, reconstructive operations were possible, whereas in 21, the joint was destroyed beyond any possibility of repair and a total hip replacement was performed. The reconstructive operations included 16 reopen reductions, five Colonna arthroplasties, six varization derotations, four open reductions and derotations, two valgization osteotomies, and 38 combined procedures. The latter included a shortening varization derotation osteotomy with an open reduction and a Chiari osteotomy of the pelvis. All the revised cases were improved in comparison with their functional status prior to revision. Of the 71 reconstructed joints, the result was good in 59. In the remaining 12, function was improved as compared with the preoperative status, but a total hip replacement will most probably be required in the future. Revision surgery after failure of previous operations for congenital dislocation of the hip can always improve function, but can rarely result in a normal joint. Primary operations should be performed with maximum caution, and it is certainly better to leave limping pain-free children alone than to transform them into limping children in pain.

Child↗

Prevention of congenital dislocation of the hip in the newborn.

Routine examination and early treatment of any instability in the hips of newborns has recently been called into question after a period of universal agreement. The hips of 49,937 neonates were prospectively studied by a general hip screening. Every unstable hip--449 in 317 children--was immediately treated with a Von Rosen splint for a 3-month-period. Overall, satisfactory reduction of the incidence of established congenital dislocation of the hip (CDH) was achieved. Risk factors leading to unstable hips (sex, first birth, and breech birth) and the development of CDH (time of stabilization) were considered.

Diagnostic Errors↗

An evaluation of the adequacy of health visitor education for neonatal hip screening.

Congenital dislocation of the hip (CDH) affects two children per 1000, with potentially serious consequences. Student health visitors in Northern Ireland learn screening techniques for CDH at a half-day workshop at a regional hospital. In order to evaluate the adequacy of this preparation, 71 qualified health visitors were surveyed to assess their knowledge relating to CDH, their views on the adequacy of the training, and their opinions about referral of positive cases. Knowledge in some areas was poor and preparation was considered too short. Direct referrals of positive cases to orthopaedic clinics, without a general practitioner acting as an intermediary, was a frequently cited desire. Recommendations include extending the training for those involved in CDH screening while ensuring that experienced health visitors, from whom novices learn, are themselves using correct procedures.

Attitude of Health Personnel↗