The purpose of the study is to evaluate the changes in peri-prosthetic bone mineral density following cemented and cementless total hip arthroplasty over a follow up period of 1 year. Ethics approval was sought and granted by the South African Medical Association Research Ethics Committee (SAMAREC). Patient consent for participation was obtained. Recruitment of the cohort took place over 2 years. Patients received an uncemented (Synergy) or cemented (Spectron) prosthesis as clinically appropriate. Functional status according to the University of California Los Angeles activity scale (UCLA scale) and bone mineral density as measured by Dual Energy X-ray Absorptiometry (DEXA) was assessed pre-operatively and at 3 months, 6 months and 12 months post-operatively. An independent Contract Research Organisation was used to monitor the site.Purpose of study:
Description of methods:
We report on six men and two women (mean age 42.5 years) who had sustained posterior dislocation of the shoulder in motor vehicle accidents (three), falls (two), equestrian accidents (two), cycling accidents (one) and in a fainting spell (one). In four patients, the dislocation was the only injury, but two had humeral shaft fractures, one a humeral neck fracture and the fourth a glenoid and humeral shaft fracture. The mean delay to diagnosis was 14 weeks (2 to 21). In three patients a medical officer, a general practitioner and a radiologist missed the dislocations, but in five orthopaedic surgeons missed them. Four patients had only anteroposterior radiographs of their shoulder taken, one had anteroposterior and lateral scapular views, and three had anteroposterior and lateral radiographs of the humerus. Four patients underwent hemi-arthroplasties and the other four open reduction and McLaughlin procedures. Though rare, posterior dislocations are often missed. Careful examination, especially in the absence of external rotation, can eliminate this. In the presence of a fracture, a dislocation or injury to the joint above and below must be excluded. Anteroposterior and lateral scapular views alone are inadequate in trauma cases and an axillary or modified axillary view should be done. If there is any doubt, CT should be performed.
In order to assess the incidence of avascular necrosis (AVN) following septic arthritis of the hip in children, we retrospectively reviewed the outcome of 227 hips with septic arthritis treated over an 18-year period. The mean age at presentation of the 221 patients, six of who had bilateral conditions, was 5.6 years (5 months to 14 years). All patients underwent open arthrotomy and pus was found at surgery. Patients were treated with cloxacillin and patients aged six months to two years also received ampicillin. Staphylococcus areus was cultured in 51% of hips, Haemophilus influenzae in 9%, Streptococcus pneumoniae in 4% and Streptococcus pyogenes in 6%. The remaining 30% had no growth. Septicaemia was present in 20 patients at presentation. AVN developed in 24 hips (10.5%), and chondrolysis in five (2.2%). Of the hips with AVN, seven were septicaemic. The most important factor in the development of AVN was a delay of five or more days from onset of symptoms to surgery. The risk of AVN with five days’ delay was 50% and increased exponentially with a longer delay. Septicaemia did not constitute a risk per se, but did contribute to a delay in diagnosis of hip involvement. The total head was involved in 14 of the 24 hips with AVN, while 10 had partial head involvement, with a better long-term outcome.
