title: Thermal cycling can extend tool life in orthopaedic operating rooms.
abstract: Thermal cycling is a temperature modulation process developed to improve the performance, durability and longevity of materials. This process has been successfully utilized in the automotive, aeronautic and manufacturing industries. Surgical cutting tools undergo cyclical loading and generally fail by dulling, suggesting that thermal cycling may improve their performance and longevity. Ten 2.5 mm orthopaedic drill bits were randomized, with five undergoing thermal cycling within their sterile packaging and five serving as untreated controls. Using a servohydraulic testing machine, 100 drilling cycles were performed with each drill bit into the diaphyseal region of bovine femurs. After every 25 cycles, data was collected by performing identical drilling cycles into simulated human cortical bone material. Maximum force, maximum normalized torque and drilling work were measured, and a scanning electron microscope was used to measure outer corner wear. After 100 drilling cycles, the maximum drilling force, maximum normalized torque, drilling work and microscopic outer corner wear were all significantly lower for the treated drill bits (p < 0.05). Thermal cycling has the potential to decrease operating room costs and thermal necrosis associated with dull cutting tools. Application of this technology may also be relevant to surgical cutting tools such as saw blades, burrs and reamers.
authors: Division of Orthopaedic Surgery, University of Toronto, Toronto, Ontario.|Orthopaedic Biomechanics Lab, Sunnybrook Research Institute, Toronto, Canada.
authors: Ryan N
authors: RN
authors: Katchky
authors: Orthopaedic Biomechanics Lab, Sunnybrook Research Institute, Toronto, Canada.
authors: Stewart D
authors: SD
authors: McLachlin
authors: Orthopaedic Biomechanics Lab, Sunnybrook Research Institute, Toronto, Canada.
authors: Edwin K Y
authors: EK
authors: Wong
authors: Division of Orthopaedic Surgery, University of Toronto, Toronto, Ontario.|Sunnybrook Health Sciences Centre, Toronto, Ontario.
authors: Joel
authors: J
authors: Finkelstein
authors: Division of Orthopaedic Surgery, University of Toronto, Toronto, Ontario.|Sunnybrook Health Sciences Centre, Toronto, Ontario.
authors: Hans J
authors: HJ
authors: Kreder
authors: Division of Orthopaedic Surgery, University of Toronto, Toronto, Ontario.|Orthopaedic Biomechanics Lab, Sunnybrook Research Institute, Toronto, Canada.
authors: Cari M
authors: CM
authors: Whyne
mesh_terms: D006358:Hot Temperature; D009983:Orthopedic Equipment; D011897:Random Allocation
keywords: bone drilling; surgical instruments; thermal cycling; tool wear