Effect of Screw Type and Distribution on the Torsional Stability of 3.5 mm String of Pearls Locking Plate Constructs

Demianiuk, Ryan M.; Benamou, Jérôme; Rutherford, Scott; Beckett, Clifford; Ness, Malcolm G.; Déjardin, Loïc M.

doi:10.1111/j.1532-950x.2014.12273.x

Cited by 6 publications

(7 citation statements)

References 34 publications

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“…Monocortical screws have been found mechanically acceptable in a bone model using locking plates, if combined with at least one bicortical screw in each fracture segment. The bicortical screws would ideally be placed close the fracture line, with the distant placement considered the second best configuration for torsional stiffness . Our results show that bicortical screw placement close to a diaphyseal fracture site is not feasible in plate‐rod constructs in feline tibiae due to the narrow medullary canal in the mid‐diaphysis, and likely interference with the IM pin.…”

Section: Discussionmentioning

confidence: 91%

“…Another limitation of our study is that we did not evaluate bicortical locking screws. We chose to test M‐lock because previous studies have suggested that a plate‐rod construct with M‐Lock may provide sufficient stability for clinical use, especially including B‐cort screws in the metaphyseal area . Being an ex vivo study, the results of the cadaveric simulation may also be limited by the reduced elasticity of cadaveric bones.…”

Section: Discussionmentioning

confidence: 99%

“…This problem is especially relevant in feline tibial fractures due to the small diameter of the medullary canal. Monocortical screws may be utilized to avert this problem, although at least 1 bicortical screw should be placed in each bone fragment to optimize torsional stability . However, no research has focused on determining the best screw combination for plate‐rod fixation of the feline tibia.…”

Section: Introductionmentioning

confidence: 99%

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An anatomical study of plate‐rod fixation in feline tibiae

et al. 2017

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An anatomical study of plate‐rod fixation in feline tibiae

et al. 2017

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“…Monocortical screws may be utilized if the intra-medullary pin is contacted during screw insertion, although at least one bicortical screw should optimally be placed in each bone fragment to optimize torsional stability. 39 The bicortical screws would ideally be placed close the fracture line, with the distant placement considered the second best configuration for torsional stiffness. 36 There are several limitations to this study, mainly stemming from the retrospective design.…”

Section: Discussionmentioning

confidence: 99%

Fracture Repair in Cats Using a Conical Coupling Mini 1.9 to 2.5 mm Locking Plate System

Ferrero¹,

Baroncelli²,

Hudson³

et al. 2020

Vet Comp Orthop Traumatol

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Objective The aim of this study was to retrospectively evaluate the clinical application of the Fixin mini 1.9 to 2.5 system for the treatment of long bone fractures in cats. We proposed that the Fixin mini system would successfully stabilize long bone fractures in cats with a healing time and complication rate similar to those previously reported for feline fractures using other locking bone plate systems. Materials and Methods Medical records and radiographs of cats with long bone fractures stabilized with the Fixin mini 1.9 to 2.5 system were retrospectively reviewed. Signalment, body weight, bone(s) fractured, region of bone fractured, fracture classification, concurrent orthopaedic injuries, complications, time to functional union, if minimally invasive plate osteosynthesis techniques were used, plate size, number of plates, bone graft use and ancillary methods of fixation were recorded. Results Fifty-six fractures in 54 cats were included. Mean time to radiographic union was 8.8 weeks. Complications were recorded in 8 out of 56 fractures. Major complications occurred in 4/56 fractures and minor complications occurred in 4/56 fractures. Conclusion The Fixin mini 1.9 to 2.5 system had an overall complication rate and time to functional union similar to that of other implant systems used to treat feline long bone fractures and it appears suitable for repair of a wide variety of long bone fracture configurations in cats.

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“…20 Additionally, a single bicortical screw in the proximal segment may also decrease resistance to torsion. 33 Contemporary low profile anatomically contoured locking compression TPLO plates with proximal screws angulating away from the articular surface have shown higher median osteotomy union scores and marginally lower complications rates. 7,9,10,25 A future study of osteotomy union comparing compression to non-compression TPLO procedures is warranted.…”

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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Effect of Screw Type and Distribution on the Torsional Stability of 3.5 mm String of Pearls Locking Plate Constructs

Cited by 6 publications

References 34 publications

An anatomical study of plate‐rod fixation in feline tibiae

An anatomical study of plate‐rod fixation in feline tibiae

Fracture Repair in Cats Using a Conical Coupling Mini 1.9 to 2.5 mm Locking Plate System

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

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