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Biomedical subjects

W J Robb

Publications and source records attributed to W J Robb.

3 recordsLinked to original sources

Massive transfusion in trauma.

The critically injured trauma patient in severe hemorrhagic shock presents a complex and arduous challenge to even the most experienced trauma staff. Lives are at stake as trauma teams feverishly pour massive amounts of blood into severely injured patients attempting to replace entire blood volumes several times over. Prompt identification of patients at risk for hemorrhage and establishment of massive transfusion protocols can provide guidance in managing the transfusion needs of the exsanguinating patient. These state-of-the-art protocols address component therapy, endpoints to transfusion and complications related to massive transfusions. Other treatments, such as autotransfusion and blood substitutes, are promising adjunctive therapies that may in the near future help to improve outcomes in patients who require massive blood transfusions. This article reviews the current standard of care for the trauma patient requiring massive transfusion.

Acute Disease↗

Polyethylene wear in unicompartmental knee arthroplasty.

From 1983 to 1989, 147 unicompartmental knee arthroplasties (UKA) were performed. Eighteen knees (13%) have required revision: there were 11 (37%) Porous Coated Anatomic (PCA), three (8%) Microloc, and four (17%) Fibermesh UKAs. Retrieved implants were examined to determine the pattern and extent of polyethylene wear. Wear was severe in each series and was characterized by delamination, pitting, peripheral cracking, deformation, and abrasion. Polyethylene failure appeared to result from large localized stresses resulting from lack of conformity of the articular geometries of the prostheses. Progressive subluxation of the implants occurred that produced very high localized contact stresses at the periphery of the tibial component where the polyethylene was thinnest. The progression of osteoarthritis in these knees, particularly the attenuation of the anterior cruciate ligament, increased the tendency of these incongruous implants to subluxate. Although changes in the design and manufacturing of unicompartmental knee arthroplasties may increase the resistance of these implants to polyethylene wear, the progression of osteoarthritis at an unpredictable rate is likely to be associated with persistent polyethylene wear in this type of arthroplasty.

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