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PubMed2001

Patient follow up screening evaluations. Examples with regard to congenital hip dislocation and congenital heart disease.

OBJECTIVE: To discuss the merits of the patient follow up study design for the evaluation of some specific mass screening programmes. DESIGN: Theoretical evaluation illustrated by two examples. SETTING: Department of Public Health Erasmus University Rotterdam. MAIN RESULTS: The gold standard for evaluation of favourable effects of screening is the randomised controlled trial (RCT). Application of an RCT, however, is often not feasible, in which cases observational studies will have to be relied on. The case-control study design is generally considered to be second best. In some situations, however, a patient follow up study design may be applicable and may have some major advantages. The use of the patient follow up design for screening evaluation will often be very problematic or even unacceptable, particularly as far as screening for cancer is concerned. The most important objections are resulting from lead time bias, length bias, selection bias and over-treatment bias. For the evaluation of screening for congenital heart disease and congenital hip dislocation in Dutch child health care, however, these objections may relatively simply be overcome. Lead time bias will be of little importance, as the ages of onset of these disorders are fixed, namely at birth, and their ultimate outcomes may be expected within relatively short time. Length bias may largely be avoided by correction for severity of the disorder, which can be adequately assessed by modern diagnostic procedures. Selection bias is generally hard to rule out, but in these cases it probably plays a minor part. Over-treatment can be avoided by the policy of "watchful waiting", which in these disorders can be applied with little risk for fatal outcomes. In principle bias might be avoided more successfully in a case-control screening evaluation than in a patient follow up study. However, the patient follow up study is for both screening programmes discussed here the more feasible design and can provide more supplementary information. The results of two example studies suggest that both screenings probably yield considerable benefits CONCLUSION: Under a number of specific conditions a patient follow up study is an efficient alternative to more customary designs for screening evaluation.

Child↗
PubMed2000

Subtrochanteric corrective osteotomy for the endoprosthetic treatment of high hip dislocation. Treatment and mid-term results with a cementless straight stem.

Total hip arthroplasty is problematical in the case of high dislocation. To reposition the hip, a femoral shortening osteotomy is necessary in order to prevent damage to the neurovascular structures. This paper describes the implantation of a cementless straight stem in 15 patients using a simple technique with a simultaneous, derotating and shortening osteotomy. Femur fractures, pseudoarthroses, stem loosening, paresis and deep infections were not found. One socket loosening was revised. Fourteen patients had good or very good results in the Merle d'Aubigne score after a median of 4.3 (range 2-5.6) years of follow-up. The surgical technique described enables the initial stable fixation of a standard prosthesis without additional osteosynthesis. Additional advantages include a shorter duration of surgery, a lower complication rate and a more rapid consolidation of the osteotomy.

Adolescent↗
PubMed1990

[Multicenter Belgian study of the results of total arthroplasty for persistent congenital hip dislocation].

The SO.B.C.O.T. proposed a multicenter study of the results of total hip replacement performed in Belgium for treatment of severe congenital dislocation. Eleven departments with about 30 surgeons contributed to this retrospective analysis, in which cases treated in different centers with various techniques are reviewed. Difficulties in data collection are discussed. Owing to the variety of data, the article is divided in 2 sections: an inquiry or descriptive analysis of congenital dislocation of the hip treated in Belgium between January 1972 and December 1987; the midterm results achieved by different techniques.

Adult↗