Abstract
Purpose
Interfragmentary strain influences whether a fracture will undergo direct and indirect fracture healing. Orthopedic trauma surgeons modulate strain and create optimal biomechanical environments for specific fracture patterns using fixation constructs. However, objective intraoperative interfragmentary strain measurement does not currently inform fixation strategy in common practice. This review identifies potential methods and technologies to enable intraoperative strain measurement for guiding optimal fracture fixation strategies.
Methods
PubMed, Scopus, and Web of Science were methodologically queried for manuscripts containing terms related to “bone fracture,” “strain,” “measurement,” and “intraoperative.” Manuscripts were systematically screened for relevance and adjudicated by three reviewers. Relevant articles describing methods to measure interfragmentary strain intraoperatively were summarized.
Results
After removing duplicates, 1404 records were screened initially. There were 49 manuscripts meeting criteria for in-depth review. Of these, four reports were included in this study that described methods applicable to measuring interfragmentary strain intraoperatively. Two of these reports described a method using instrumented staples, one described optical tracking of Kirschner wires, and one described using a digital linear variable displacement transducer with a custom external fixator.
Conclusion
The four reports identified by this review describe potential methods to quantify interfragmentary strain after fixation. However, further studies are needed to confirm the precision and accuracy of these measurements across a range of fractures and fixation methods. Additionally, described methods require the insertion and likely removal of additional implants into the bone. Ideally, innovations that measure interfragmentary strain intraoperatively would provide dynamic biomechanical feedback for the surgeon to proactively modulate construct stability.
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JH, AR, and MDB contributed to methodology; AR, JH, and MDB contributed to formal analysis and investigation; AR contributed to writing-original draft preparation; AR, JH, MB, AP, SC, and CP contributed to writing—review and editing; and MDB contributed to supervision.
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Rechenmacher, A.J., Helmkamp, J., Brown, M. et al. Interfragmentary strain measurement post-fixation to guide intraoperative decision making: a narrative review. Eur J Orthop Surg Traumatol 33, 3299–3305 (2023). https://doi.org/10.1007/s00590-023-03605-y
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DOI: https://doi.org/10.1007/s00590-023-03605-y