A Comparison of Screw Insertion Torque and Pullout Strength

Ricci, William M.; Tornetta, Paul; Petteys, Timothy; Gerlach, Darin; Cartner, Jacob; Walker, Zakiyyah; Russell, Thomas A.

doi:10.1097/bot.0b013e3181c4a655

Cited by 79 publications

(63 citation statements)

References 11 publications

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“…1). This observance was similar to that found by Ricci et al, 8 which likely occurred as a result of overcoming the shear forces exerted by the screw threads. There was a decrease in screw pullout strength as drying time increased.…”

Section: Resultssupporting

confidence: 86%

Can We Trust Ex Vivo Mechanical Testing of Fresh–Frozen Cadaveric Specimens? The Effect of Postfreezing Delays

Cartner¹,

Hartsell²,

Ricci³

et al. 2011

Journal of Orthopaedic Trauma

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This study indicates that when using fresh-frozen cadaveric bone in biomechanical tests to simulate the orthopaedic clinical setting, specimen exposure time should be considered. The timing of testing should be kept constant between specimens to allow for a proper comparison. Furthermore, for fresh--frozen cadavers, the physical properties of bone may be detrimentally affected in biomechanical testing that exceeds the 50-hour time point after removal from the freezer.

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Section: Resultssupporting

confidence: 86%

Can We Trust Ex Vivo Mechanical Testing of Fresh–Frozen Cadaveric Specimens? The Effect of Postfreezing Delays

Cartner¹,

Hartsell²,

Ricci³

et al. 2011

Journal of Orthopaedic Trauma

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“…Outside of RSA literature, various studies have described the torsion‐axial force relationship and its importance for screw function and design in the context of internal fixation for fractures and with dental implants . For example, Shetty et al used a similar mechanical testing setup to investigate the characteristics of screw prototypes and conventional titanium screws used in orthognathic surgery.…”

Section: Discussionmentioning

confidence: 99%

“…Because the assumption that a screw‐in baseplate requires bicortical fixation has not been validated, we elected to use uniform density foam blocks. This model has been widely used in the published literature …”

Section: Discussionmentioning

confidence: 99%

Relationship Between Insertion Torque and Compression Strength in the Reverse Total Shoulder Arthroplasty Baseplate

Diaz

Garrigues

Ricchetti

et al. 2019

Journal Orthopaedic Research

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Reverse shoulder arthroplasty is a well‐established procedure, however, there is limited data in the literature regarding adequate insertion torque and the resulting compression for glenoid baseplate fixation. In this biomechanical study, we evaluated the relationship between insertion torque and baseplate compression by simultaneously measuring the insertion torque and axial compressive forces generated by two reverse shoulder arthroplasty baseplates with central screw design. Three different bone surrogates were chosen to mimic clinical scenarios where differences in compression achieved during baseplate insertion may exist due to varying bone quality. Epoxy resin sheets were combined with the bone surrogates to simulate the glenoid vault. A digital torque gauge was used to measure insertion torque applied to the baseplate, while compression data were collected continuously from a load cell. A strong positive correlation was found between baseplate compression and insertion torque. Among the lower density bone surrogates, neither baseplate design reached maximum insertion torque (6.8 Nm) due to material strip‐out. This phenomenon did not occur in denser bone surrogates. Both baseplate designs experienced a significant increase in mean baseplate compression as insertion torque increased and were found to behave similar in the denser bone surrogates. The results presented here suggest that larger compressive forces can be achieved with an increase in insertion torque in denser bone surrogates, but caution must be used when trying to achieve fixation in poor‐quality bone. Clinically, this could be useful preoperatively to minimize baseplate failure, and in further studies regarding baseplate design for improved initial fixation and stability. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:871‐879, 2020

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“…Our experimental design was adapted from that of Ricci et al 2 and based on Standard Specification and Test Methods for Metallic Medical Bone Screws ASTM F543-07. 14 Four fellowship-trained orthopaedic surgeons and four postgraduate year 5 orthopaedic chief residents each inserted a total of 10 screws into a polyurethane foam cancellous bone substitute (Pacific Research Laboratories, Vashon, WA) under standardized conditions.…”

Section: Overviewmentioning

confidence: 99%

The effect of insertion technique and surgeon experience on the pullout strength of orthopaedic screws

Meals

Fox

Zhang³

et al. 2016

Current Orthopaedic Practice

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A Comparison of Screw Insertion Torque and Pullout Strength

Cited by 79 publications

References 11 publications

Can We Trust Ex Vivo Mechanical Testing of Fresh–Frozen Cadaveric Specimens? The Effect of Postfreezing Delays

Can We Trust Ex Vivo Mechanical Testing of Fresh–Frozen Cadaveric Specimens? The Effect of Postfreezing Delays

Relationship Between Insertion Torque and Compression Strength in the Reverse Total Shoulder Arthroplasty Baseplate

The effect of insertion technique and surgeon experience on the pullout strength of orthopaedic screws

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