Long-term performance of ceramic and metal femoral heads on conventional polyethylene in young and active patients: a matched-pair analysis.

Background: Ceramic femoral heads produce less wear of the opposing polyethylene than do metal femoral heads in wear simulation studies. This is a matched-pair analysis of the wear of ceramic and metal femoral heads on conventional polyethylene in uncemented total hip replacements in young, active patients at a minimum of fifteen years of follow-up.

Methods: From June 1989 to May 1992, thirty-one matched pairs of alumina ceramic or cobalt-chromium metal femoral heads were identified.

Pain management after total knee arthroplasty using a multimodal approach.

Improvements in pain management techniques over the past decade have had a significant impact on the outcomes of total knee arthroplasty. Of these techniques, multimodal approaches have shown potential. The purpose of this study was to compare the results of periarticular injection (PAI) to a combination of patient-controlled epidural analgesia and femoral nerve block (PCEA/FNB).

Post-operative guidelines following hip arthroscopy.

Rehabilitation following hip arthroscopy can vary significantly. Existing programs have been developed as a collaborative effort between physicians and rehabilitation specialists. The evolution of protocol advancement has relied upon feedback from patients, therapists and observable outcomes.

Working memory overload: fronto-limbic interactions and effects on subsequent working memory function.

The human working memory system provides an experimentally useful model for examination of neural overload effects on subsequent functioning of the overloaded system. This study employed functional magnetic resonance imaging in conjunction with a parametric working memory task to characterize the behavioral and neural effects of cognitive overload on subsequent cognitive performance, with particular attention to cognitive-limbic interactions. Overloading the working memory system was associated with varying degrees of subsequent decline in performance accuracy and reduced activation of brain regions central to both task performance and suppression of negative affect.