Etanercept does not impair healing in rat models of tendon or metaphyseal bone injury
2012 (English)In: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 83, no 3, 305-310 p.Article in journal (Refereed) Published
Background and purpose Should blockade of TNF-alpha be avoided after orthopedic surgery? Healing of injuries in soft tissues and bone starts with a brief inflammatory phase. Modulation of inflammatory signaling might therefore interfere with healing. For example, Cox inhibitors impair healing in animal models of tendon, ligament, and bone injury, as well as in fracture patients. TNF-alpha is expressed locally at increased levels during early healing of these tissues. We therefore investigated whether blocking of TNF-alpha with etanercept influences the healing process in established rat models of injury of tendons and metaphyseal bone. less thanbrgreater than less thanbrgreater thanMethods Rats were injected with etanercept, 3.5 mg/kg 3 times a week. Healing of transected Achilles tendons and bone healing around screws implanted in the tibial metaphysis were estimated by mechanical testing. Tendons were allowed to heal either with or without mechanical loading. Ectopic bone induction following intramuscular BMP-2 implants has previously been shown to be stimulated by etanercept in rodents. This was now tested as a positive control. less thanbrgreater than less thanbrgreater thanResults Tendon peak force after 10 days was not significantly influenced by etanercept. Changes exceeding 29% could be excluded with 95% confidence. Likewise, screw pull-out force was not significantly influenced. More than 25% decrease or 18% increase could be excluded with 95% confidence. However, etanercept treatment increased the amount of bone induced by intramuscular BMP-2 implants, as estimated by blind histological scoring. less thanbrgreater than less thanbrgreater thanInterpretation Etanercept does not appear to impair tendon or metaphyseal bone healing to any substantial degree.
Place, publisher, year, edition, pages
Informa Healthcare , 2012. Vol. 83, no 3, 305-310 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-79101DOI: 10.3109/17453674.2012.693018ISI: 000304781000018OAI: oai:DiVA.org:liu-79101DiVA: diva2:538255
Funding Agencies|Swedish Research Council|2009-6725|Linkoping University, Ostergotland County Council, Swedish Centre for Research in Sports||King Gustaf V and Queen Victoria Free Mason Foundation||2012-06-292012-06-292014-04-01