Original articleInsertional torque of the lumbar pedicle screw during surgery
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Cited by (46)
Predicting pullout strength of pedicle screws in broken bones from X-ray images
2022, Journal of the Mechanical Behavior of Biomedical MaterialsA novel parameter for the prediction of pedicle screw fixation in cancellous bone - A biomechanical study on synthetic foam
2020, Medical Engineering and PhysicsCitation Excerpt :As discussed above, the relationship between insertion torque and pull-out strength is not clearly established in biomechanical studies with donor material. In addition, no correlation between insertion torque and screw loosening could be demonstrated in a clinical study [35]. Consequently, there is a need for methods to predict screw anchorages, ideally already in the surgery planning phase.
Value of standard radiographs, computed tomography, and magnetic resonance imaging of the lumbar spine in detection of intraoperatively confirmed pedicle screw loosening—a prospective clinical trial
2019, Spine JournalCitation Excerpt :Rates from 1% to 40% are reported [1–4] depending on age, bone quality, and number of fused levels [5]. However, in most reports, the judgment of screw fixation is based on plain radiograph assessment [6–11]. A radiolucent zone surrounding a pedicle screw can be a sign of screw loosening, but a loose screw is not always surrounded by a radiolucent zone [7].
Effect of osteoporosis on the clinical and radiological outcomes following one-level posterior lumbar interbody fusion
2018, Journal of Orthopaedic ScienceCitation Excerpt :Cage subsidence was defined as a displacement of cages by > 2 mm into the upper or lower endplates in the reconstructive images of CT scans. Loosening of screws was assessed with a 1 mm thickness criterion of radiolucency in the lateral radiographs or CT images [15,16]. Other implant failures were evaluated by plain radiographs.
Pull out strength calculator for pedicle screws using a surrogate ensemble approach
2016, Computer Methods and Programs in BiomedicineCitation Excerpt :Studies to date have found a conflicting relationship between insertion torque and pullout strength. Several experimental studies have reported a positive correlation between insertion torque and pull out strength in biomechanical tests [11–13] whereas some found no correlation [14–16]. Since insertion torque is measured during screw placement, this seldom alters screw selection in clinical practice [10].
Intraoperative mechanical measurement of bone quality with the densiprobe
2015, Journal of Clinical DensitometryCitation Excerpt :In vitro, correlations were shown between insertional torque and pullout force, insertional torque and number of cycles to ultimate pedicles screw pullout, and between the maximum insertion torque and screw pullout force (15,16). Clinical trials could not show a correlation between insertion torque and prediction of mechanical failure in vivo (17,18). One major limitation of this method is that the measurement of screw insertion torque is based on the subjectively defined endpoint of maximum insertional torque (19).