Periprosthetic bone mineral density changes with femoral components of differing design philosophy.

We measured the bone mineral density in 22 patients with the cylindrical stemmed cobalt-chrome AML prosthesis (collared) and in 22 patients with the tapered stem titanium CLS prosthesis (collarless). DEXA scanning was undertaken at a mean of 40 months in the AML and 52 months in the CLS group from the time of implant insertion. In both groups the greatest mean loss of BMD was found in Gruen zone 7 and the least change in Gruen zone 5.

A computerized information system for monitoring and evaluating substance misuse services.

A computerized, comprehensive information system for the managerial monitoring and evaluation of local substance misuse service delivery is presented. It is based on a model which comprises basic elements of service provision such as, client caseload, time management and workload, work and client satisfaction, in both quantitative and qualitative terms. Findings from its initial implementation in a community drug team and drug dependency units in one of the London District Health Authorities are discussed.