3:09 PMAbstract No. 297 - A biomechanical testing model for evaluating the feasibility of percutaneous osteoplasty in weight-bearing bones

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Purpose

While percutaneous osteoplasty is common in the treatment of osseous tumors, weak mechanical strength and the lack of consistent testing methods limit its use in weight-bearing bones. In this study, we performed percutaneous fracture fixation using stent-wire scaffold and cement augmentation, and evaluated the scope of procedure from four point bend test.

Materials

Nine explanted pig femurs were divided into: stent-wire-cementoplasty group (Group 1), cementoplasty only group (Group 2), and intact bones (controls). Mid-shaft circumferential fractures were simulated on the first two groups followed by fixation procedure under fluoroscopy, which involved stent placement, insertion of Lunderquist wires, and cement augmentation for Group1 while only cement augmentation for Group 2. Biomechanical properties of the samples were examined from four point bend

Results

The accompanying table shows the mechanical properties of the specimen for different groups. The average displacement for Groups 1, 2 and controls from fatigue test were 1.12±0.1um, 1.65±0.48um, and 0.8±0.05um respectively.

Conclusions

The presence of stent-wire scaffolding resulted into improved mechanical properties of the fractured bone; however, the strength of fixation was not significantly higher compared to cementoplasty alone or control. Further development in scaffolding technique could result into a potential therapeutic model for metastatic or surgical risk group patients.

Mechanical Properties of the Specimen

GroupPeak Load (N)Flexural Stiffness (Nm/degree)Energy Absorption (Nmm)
1864±18516±2.2479±55
2747±136N11.5±1.9

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