Tightening force and torque of nonlocking screws in a reverse shoulder prosthesis

Terrier, Alexandre; Kochbeck, Stephanie H; Merlini, Francesco; Gortchacow, Miguel; Pioletti, Dominique P.; Farron, Alain

doi:10.1016/j.clinbiomech.2010.03.011

Cited by 15 publications

(5 citation statements)

References 25 publications

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“…To the best of our knowledge, the relationship between applied torque and the resulting compressive force of an RSA baseplate with central screw fixation has not been investigated. Terrier et al studied the relationship of tightening force and torque of non‐locking peripheral screws in RSA. Moreover, previous studies have shown a tenfold increase in compressive force in a baseplate with a central screw compared to one with a smooth central post, but little has been done to fully understand this relationship and possible outcomes.…”

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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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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“…In the LP fixation model, the plate was offset by 2 mm from the bone [ 28 ]. In the DCP fixation model, a maximum torque of 1 Nm was utilized to tighten the compression screw with a torque control screwdriver [ 29 , 30 ].…”

Section: Methodsmentioning

confidence: 99%

Fixation stability comparison of bone screws based on thread design: buttress thread, triangle thread, and square thread

Feng

Luo

et al. 2022

BMC Musculoskelet Disord

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Background The influence of thread profile on the fixation stability of bone screws remains unclear. This study aimed to compare the fixation stability of screws with different thread profiles under several loading conditions. Methods Bone screws that differed in thread profile (buttress, triangle, and square thread) only were made of stainless steel. Their fixation stabilities were evaluated individually by the axial pullout test and lateral migration test, besides, they were also evaluated in pairs together with a dynamic compression plate and a locking plate in polyurethane foam blocks under cyclic craniocaudal and torsional loadings. Results The triangle-threaded and square-threaded screws had the highest pullout forces and lateral migration resistance. When being applied to a dynamic compression plate, higher forces and more cycles were required for both triangle- and square-threaded screws to reach the same displacement under cyclic craniocaudal loading. On the other hand, the triangle-threaded screws required a higher torque and more cycles to reach the same angular displacement under cyclic torsional loading. When being applied to a locking plate, the square-threaded screws needed higher load, torque, and more cycles to reach the same displacement under both cyclic craniocaudal and torsion loadings. Conclusions The triangle-threaded screws had superior pullout strength, while square-threaded screws demonstrated the highest lateral migration resistance. Moreover, dynamic compression plate fixation with triangle- and square-threaded screws achieved more favorable fixation stability under craniocaudal loading, while triangle-threaded screws demonstrated superior fixation stability under torsional loading. Locking plate fixation with a square-threaded screw achieved better fixation stability under both loading types.

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“…Experimental work by Perren listed that a compressive force of 2000–3000 N would be needed per screw, but other experimental results indicated that lower force values were needed. For example, a shoulder implant study by Terrier et al found that a maximum force of 350 N imparted by the screw between the implant and scapula using 4.5‐mm diameter screws and a max torque of 2.1 Nm was needed. Cartner et al , which used osteopenic femurs, found that a force of 88 N at 1.5‐Nm torque was needed.…”

Section: Methods: Fe Model Developmentmentioning

confidence: 99%

A finite element parametric study of clavicle fixation plates

Pendergast

Rusovici

2015

Numer Methods Biomed Eng

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A finite element simulation on a fracture fixated clavicle was performed to study the effects of different fracture fixation parameters on the callus region. Specifically, parameters such as plate material, thickness, plate/bone gap, screw length, and locking vs. non-locking screws were explored. Plate thickness and locking vs. non-locking screws were found to be influential to construct stiffness where plate/bone gap and number of screws were not as sensitive.

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Tightening force and torque of nonlocking screws in a reverse shoulder prosthesis

Cited by 15 publications

References 25 publications

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

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

Fixation stability comparison of bone screws based on thread design: buttress thread, triangle thread, and square thread

A finite element parametric study of clavicle fixation plates

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