Biomechanical Comparison of Pull-out Strength of Different Cementation and Pedicle Screw Placement Techniques in a Calf
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ORIGINAL ARTICLE
Biomechanical Comparison of Pull‑out Strength of Different Cementation and Pedicle Screw Placement Techniques in a Calf Spine Model Turgut Akgül1 · Murat Korkmaz2 · Tuna Pehlivanoglu3 · Serkan Bayram1 · Mustafa Abdullah Özdemir1 · Şahin Karalar1 Received: 1 May 2020 / Accepted: 11 July 2020 / Published online: 20 July 2020 © Indian Orthopaedics Association 2020
Abstract Background We hypothesized that an entire pedicle screw tract cement augmentation has greater strength than traditional techniques. Method Twenty-four fresh frozen calf lumbar spines were randomized into three study groups, each having eight vertebrae: (1) screw cemented after vertebroplasty; (2) fenestrated cemented screw; and (3) cementation of the entire pedicle screw tract. For the right side screws, two pedicle screws were inserted in each vertebra with the standard position in the sagittal plane, whereas the left side screws were placed at a 30° angle craniocaudal plane. From the recorded force–displacement curves, the maximum peak load (failure load) of each screw was determined. The mode of failure was screw stripping at all levels tested. Results The pull-out strength for standard screw replacement at the sagittal plane was 1843.3 N, 1707.45 N, and 5365.1 N consecutively. The failure load value in the standard position in the sagittal plane in the cementation of the entire pedicle screw tract group was significantly higher than that in the fenestrated cemented screw group and screw cemented after vertebroplasty (p
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