Effect of Screw Insertion Torque on Push‐Out and Cantilever Bending Properties of Five Different Angle‐Stable Systems

Baroncelli, Alessandro Boero; Reif, U.; Bignardi, Cristina; Peirone, Bruno

doi:10.1111/j.1532-950x.2013.01088.x

Cited by 31 publications

(26 citation statements)

References 14 publications

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“…Generally, in the clinical practice, only the result of multiple coupled variations can be observed, while dedicated experimental and numerical studies can allow to isolate each contribution. [4][5][6] Evaluation criteria include range of motion from impingement to the onset of subluxation, and resisting moment built-up during dislocation. Resisting moments have been seldom considered and require the simulation of both geometry and forces acting on the joint (articular force and muscle forces).…”

Section: Introductionmentioning

confidence: 99%

A multibody model for the optimization of hip arthroplasty in relation to range of movement

Zanetti¹,

Bignardi²,

Terzini³

et al. 2018

AMJ

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BackgroundThe dislocation of the prosthesized hip is a relevant postoperative complication; this adverse outcome is dependent on the specific patient anatomy and on the artificial joint design. The geometry of the reconstructed hip is one of the key factors and it is usually designed at the time of the preoperative planning when the stem model and size, the head diameter and its offset, and the acetabular cup orientation are selected. AimsIn this work, the authors have developed a numerical model to support the pre-operative planning, allowing assessing the hip range of motion, once the geometry of the implant has been defined. MethodsA multi-body model of a prosthesized hip has been developed, and a dislocating movement has been applied; the software is able to assess the entity of displacements and of applied forces which can produce hip dislocation. ResultsAs a proof of concept, multiple combinations of geometric factors have been examined that are the head diameter, the acetabular cup anteversion and its inclination, reaching a total number of 675 configurations. This software is able to analyse and compare all configurations in few minutes. ConclusionThe developed numerical model can be a support to quickly compare a great number of solutions from the point of view of hip stability, reaching a comprehensive view of all possibilities, and giving a contribute to the final aim that is surgery optimization, in relation to each specific patient. What this study adds: What is known about this subject?Hip dislocation is a relevant complication in hip arthroplasty; this adverse outcome is dependent on the specific patient anatomy and on the artificial joint design. What new information is offered in this study?This study introduced a methodology, based on multibody model, which allows optimising the choice of prosthetic components and their positioning in relation to dislocation risk. What are the implications for research, policy, or practice?The pre-operative planning of hip arthroplasty can take benefit from numerical methods able to foresee the final hip range of motion.

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Section: Introductionmentioning

confidence: 99%

A multibody model for the optimization of hip arthroplasty in relation to range of movement

Zanetti¹,

Bignardi²,

Terzini³

et al. 2018

AMJ

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“…This mode of failure for the SOP construct has been described in a biomechanical study comparing the effect of screw insertional torque on cantilever bending and screw push out strength in angle stable locking systems. 24 Additionally, translation of the screw within the plate hole was detected when bending moment was applied. 24 This may manifest as micromotion at the screw plate interface leading to overt screw loosening in some cases.…”

Section: Discussionmentioning

confidence: 99%

“…24 Additionally, translation of the screw within the plate hole was detected when bending moment was applied. 24 This may manifest as micromotion at the screw plate interface leading to overt screw loosening in some cases.…”

Section: Discussionmentioning

confidence: 99%

A Retrospective Study Using the String of Pearls Tibial Plateau Levelling Osteotomy Locking Plate for the Treatment of Cranial Cruciate Ligament Disease

McGregor¹,

Buffa²,

Tan

et al. 2019

Vet Comp Orthop Traumatol

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Objective The aim of this study was to describe the use of String of Pearls (SOP) tibial plateau levelling osteotomy (TPLO) locking plates for the treatment of cranial cruciate ligament disease and retrospectively assess osteotomy healing, tibial plateau angle (TPA) change (c) and overall complication rates. Methods Medical records and radiographic studies of 170 SOP TPLO surgical procedures were analysed. Radiographic measurement of TPAc and osteotomy union was determined 6 to 8 weeks postoperatively. Intra- and postoperative major and minor complications were identified. Factors influencing TPAc, osteotomy union and complications were assessed. Results Mean (standard deviation) TPAc was 1.3° (1.61) and median osteotomy union was graded as 2 (26–50%) union. Improved osteotomy union was associated with retention of the antirotational pin (odds ratio [OR]: 2.3; 95% confidence interval [CI]: 1.3–4; p = 0.005) and reduced TPAc (OR: 0.8; 95%CI: 0.66–0.97; p = 0.02). Complications occurred in 42 (24.7%) procedures with 11 (6.5%) considered major and 31 (18.2%) minor. Clinical significance The use of the SOP TPLO plating system resulted in a median grade 2 (26–50%) radiographic osteotomy union score at 6 to 8 weeks' follow-up, less than previous TPLO locking plate studies. Osteotomy union was associated with retention of the antirotational pin and reduced TPAc. Major and minor complication rates were marginally greater than recent locking plate studies with fibular fracture and screw loosening common complications. The use of SOP TPLO plates is cautioned and further study is warranted.

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“…Despite the increasing acceptance of angle‐stable implants, to date, there is a paucity of peer‐reviewed studies evaluating the mechanical properties of these different systems. One study evaluated the effect of screw insertion torque on strength of the screw‐plate interface using a protocol in which screws were axially loaded along their axes until decoupling occurred . Whereas this information helps characterize the strength of the mechanical interlock, it is of limited clinical relevance as it does not represent in vivo loads applied to bone screws.…”

Section: Specifications Of Locking Screws From Ngd Pax Syn and Voimentioning

confidence: 99%

“…Indeed, after fracture repair, as a result of their orientation perpendicular to the bone longitudinal axis, plate screws are subjected to cantilever bending and shear rather than compressive loads. To date, there is a dearth of information characterizing the mechanical behavior of the screw‐plate interface of these angle‐stable implants under bending conditions …”

Section: Specifications Of Locking Screws From Ngd Pax Syn and Voimentioning

confidence: 99%

Effect of Screw Insertion Torque on Mechanical Properties of Four Locking Systems

et al. 2013

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Effect of Screw Insertion Torque on Push‐Out and Cantilever Bending Properties of Five Different Angle‐Stable Systems

Abstract: Locking mechanisms using "thread in thread" principle provided a stronger screw push-out behavior. Screws materials and core diameter of the different screws were directly related to cantilever bending strength.

Cited by 31 publications

References 14 publications

A multibody model for the optimization of hip arthroplasty in relation to range of movement

A multibody model for the optimization of hip arthroplasty in relation to range of movement

A Retrospective Study Using the String of Pearls Tibial Plateau Levelling Osteotomy Locking Plate for the Treatment of Cranial Cruciate Ligament Disease

Effect of Screw Insertion Torque on Mechanical Properties of Four Locking Systems

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