Septic arthritis has been regarded as rare in haemophiliacs, but its incidence may have increased since HIV infection has become widespread in these patients. We describe six cases treated at one haemophffia unit over a two-year period and discuss their investigation, diagnosis and treatment. Four of the patients were seropositive to anti-HIV.

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Deep vein thrombosis (DVT) and acute urinary retention are both common complications of total hip replacement. Previous experimental studies have demonstrated that bladder distension obstructs the iliac veins causing a decrease in venous outflow from the legs, and that after hip replacement a decrease in venous outflow is associated with the development of DVT. This suggests that acute urinary retention after joint replacement predisposes to DVT and that routine catheterisation would reduce the risk of DVT. The aim of the study was to determine, using strain gauge venous plethysmography, whether acute urinary retention after joint replacement causes a decrease in venous outflow from the legs. It was found that acute retention did not significantly alter the venous outflow. We therefore conclude that acute urinary retention after joint replacement does not predispose to DVT.