Failure of the pedicle screw at the screw-bone interface is a common clinical problem, particularly in the setting of osteoporosis, and poses reconstructive challenges for all orthopaedic surgeons. Pedicle screw failure through screw loosing and pull-out is highly correlated with bone mineral density (BMD) and local bone quality . Pre-operative assessment of BMD via dual x-ray absorptiometry (DEXA) has been shown to help determine the need for screw augmentation. However, patients frequently present without pre-operative DEXA scans. Furthermore, DEXA scans provide a measure of general bone quality, but do not necessarily reflect segmental and local variation in the spine . The ability to assess BMD on a per-vertebrae basis intra-operatively would assist with surgical decisions regarding screw sizing, placement and augmentation.
- Bioengineering Division
Assessment of Cancellous Bone Strength in the Lumbar Spine Using a “Smart” Ball-Tip Probe
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Liddle, KD, Tufaga, MA, Diekmann, G, Buckley, JM, Tai, V, Mulligan, K, Ames, C, & McClellan, RT. "Assessment of Cancellous Bone Strength in the Lumbar Spine Using a “Smart” Ball-Tip Probe." Proceedings of the ASME 2010 Summer Bioengineering Conference. ASME 2010 Summer Bioengineering Conference, Parts A and B. Naples, Florida, USA. June 16–19, 2010. pp. 179-180. ASME. https://doi.org/10.1115/SBC2010-19121
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