Journal of Long-Term Effects of Medical Implants

ISSN for PRINT: 1050-6934

For Online Access

Best Paper Award Selection - Editorial Board Site

2006, Volume16

Issue 1

120 pages

Issue price - $189.00

Gamal Baroud
Laboratoire de biomécanique, Département de genie mécanique, Université de Sherbrooke, Sherbrooke, Canada

Tara Swanson
Co-operative Education Program, Faculty of Kinesiology, Simon Fraser University, Burnaby, BC, Canada

Thomas Steffen
Orthopaedic Research Laboratory, Division of Orthopaedic Surgery, McGill University, Montreal, QC, Canada

Study design. Experimental study conducted in the laboratory with six different bone cements. Objectives. To isolate the thermal properties of conventional and emerging bone cements used in vertebroplasty and to characterize their setting behavior. Summary of background data. The heat released during setting has been linked to the desirable effects of pain relief and tumor destruction and to the undesirable effect of thermal necrosis of surrounding tissue. However, there are currently no studies that disconnect the exothermic reaction of the cements from the media in which they occur. Before the combined thermal effect is examined, it is important to understand the setting properties of cements alone. Methods. Thirty independent experiments were conducted with four PMMA cements (Cranioplastic, Vertebroplastic, Palacos LV-40, Antibiotic Simplex) and two calcium-phosphate cements (chronOS Inject and Biopex) in accordance with ASTM standard F 451-99a. A thermocouple was placed in the center of the cement mass, and the temperature-versus-time measurements were recorded. Results. The calcium-phosphate cements took over half an hour to reach their maximum temperature, which was only 3−4 °C higher than the ambient temperature. The temperature increase for the acrylic cements was between 16 and 23 °C, and it took about 15 minutes to reach the maximum temperature. The variation within the groups was also important. Conclusion. The exothermic reaction of calcium-phosphate cements appears to be insignificant. Although the acrylic cements release considerably greater heat in a much shorter time period, it does not appear that their temperature is sufficiently high to cause extensive thermal injury. However, variations within each group must be considered along with the intended use when deciding on the cement to be used.

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