Journal of Rehabilitation Research & Development (JRRD)

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Volume 46 Number 9, 2009
   Pages 1109 — 1120

Abstract — Effectiveness of resonance frequency in predicting orthopedic implant strength and stability in an in vitro osseointegration model

Brad M. Isaacson, BS;1-2* Richard E. Vance, BS;3 Teri G. Rosenbaum Chou, PhD;4 Roy D. Bloebaum, PhD;1-3 Kent N. Bachus, PhD;1-3 Joseph B. Webster, MD1,5

1Bone and Joint Research Laboratory, Department of Veterans Affairs Salt Lake City Health Care System, Salt Lake City, UT; 2Department of Bioengineering, University of Utah, Salt Lake City, UT; 3Department of Orthopaedics, University of Utah, Salt Lake City, UT; 4Orthocare Innovations, Seattle, WA; 5Department of Physical Medicine and Rehabilitation, University of Utah, Salt Lake City, UT

Abstract — Developing noninvasive tools that determine implant attachment strength to bone and monitor implant stability over time will be important to optimize rehabilitation protocols following insertion of osseointegrated implants in patients with limb loss. While resonance frequency has been previously shown to correlate with implant stability in dental implants placed in the mandible and maxilla, this tool has not been evaluated with implants placed in the medullary canal of long bones. In an in vitro model used to simulate irregular medullary canal implant contact and osseointegration, a strong positive correlation was determined between resonance frequency implant stability quotient values and the force required for implant pushout. The force required for implant displacement also correlated to the distance from the point of fixation to the transducer at the proximal end of the implant (point of resonance frequency monitoring).

Key words: bone, bone-implant interface, implant stability, limb amputation, mechanical testing, osseointegration, outcomes, rehabilitation, resonance frequency, skeletal fixation.

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