1
|
Zhao X, Zhang X, Ma B, Tong X. Stress-shielding effects of locked compression plates in fixing dog femurs. Asian J Surg 2024; 47:4555-4556. [PMID: 39117544 DOI: 10.1016/j.asjsur.2024.07.254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2024] [Accepted: 07/21/2024] [Indexed: 08/10/2024] Open
Affiliation(s)
- Xinwen Zhao
- Department of Orthopaedics, Shanxi YK Healthcare General Hospital(YunCheng First Hospital), ShanXi, 441000, China.
| | - Xiaoyan Zhang
- Department of Radiology, Shanxi YK Healthcare General Hospital(YunCheng First Hospital), ShanXi, 441000, China
| | - Baoan Ma
- Institution of Orthopaedics, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, China
| | - Xun Tong
- Department of Traditional Chinese Medicine Rehabilitation and Psysiotherapy, Xu Tong Army 71st Group Army Hosptial, Jiangsu Province, 221000, China
| |
Collapse
|
2
|
de Bruyn BW, Glyde M, Day R, Hosgood G. Effect of an Orthogonal Locking Plate and Primary Plate Working Length on Construct Stiffness and Plate Strain in an In vitro Fracture-Gap Model. Vet Comp Orthop Traumatol 2024; 37:173-180. [PMID: 38331034 DOI: 10.1055/s-0044-1779496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
OBJECTIVE The aim of this study was to compare stiffness and strain of an in vitro fracture-gap model secured with a primary 3.5-mm locking compression plate (LCP) at three primary plate working lengths without and with an orthogonal 2.7-mm LCP. STUDY DESIGN Primary plate screw configurations modeled short working length (SWL), medium working length (MWL), and long working length (LWL) constructs. Construct stiffness with and without an orthogonal plate during nondestructive four-point bending and torsion, and plate surface strain measured during bending, was analyzed. RESULTS Single plate construct stiffness was significantly, incrementally, lower in four-point bending and torsion as working length was extended. Addition of an orthogonal plate resulted in significantly higher bending stiffness for SWL, MWL, and LWL (p < 0.05) and torsional stiffness for MWL and LWL (p < 0.05). Single plate construct strain was significantly, incrementally, higher as working length was extended. Addition of an orthogonal plate significantly lowered strain for SWL, MWL, and LWL constructs (p < 0.01). CONCLUSION Orthogonal plate application resulted in higher bending and torsional construct stiffness and lower strain over the primary plate in bending in this in vitro model. Working length had an inverse relationship with construct stiffness in bending and torsion and a direct relationship with strain. The inverse effect of working length on construct stiffness was completely mitigated by the application of an orthogonal plate in bending and modified in torsion.
Collapse
Affiliation(s)
| | - Mark Glyde
- School of Veterinary Medicine, Murdoch University, Perth, Australia
| | - Robert Day
- Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Australia
| | - Giselle Hosgood
- School of Veterinary Medicine, Murdoch University, Perth, Australia
| |
Collapse
|
3
|
Sembenelli G, Souza G, Wittmaack M, Shimano A, Rocha T, Moraes P, Minto B, Dias L. Biomechanical comparison of a modified TPLO plate, a locking compression plate, and plate-rod constructs applied medially in a proximal gap model in canine synthetic tibias. ARQ BRAS MED VET ZOO 2022. [DOI: 10.1590/1678-4162-12557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
ABSTRACT The aim of this study was to develop a modified tibial plateau leveling osteotomy (TPLO) plate and to compare its biomechanical properties with a locking compression plate (LCP) and plate-rod constructs for the stabilization of experimentally induced gap fractures in canine synthetic tibias. The tibial models were assigned to either repair with a modified TPLO plate (Group 1), locking compression plate construct (Group 2), or plate-rod construct (Group 3). The specimens were loaded to failure in axial compression, three-point mediolateral and craniocaudal bending. There was no statistical difference between the three groups regarding stiffness (N/mm) and deformation (mm) in axial compression. The modified TPLO plate achieved load to failure similar to the plate-rod construct in craniocaudal bending. There was no significant difference between groups on mediolateral bending tests regarding load to failure and deformation. Furthermore, there was no significant difference in stiffness between groups 1 and 2. In conclusion, the modified TPLO plate had similar mechanical properties to LCP and plate-rod construct in the axial compression and bending tests. Nonetheless, clinical studies with a large population of dogs are required to determine the value of this new implant in proximal tibial fracture repair.
Collapse
|
4
|
Deprey J, Blondel M, Saban C, Massenzio M, Gauthier O, Moissonnier P, Viguier E, Cachon T. Mechanical evaluation of a novel angle-stable interlocking nail in a gap fracture model. Vet Surg 2022; 51:1247-1256. [PMID: 35675144 DOI: 10.1111/vsu.13837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 03/05/2022] [Accepted: 05/14/2022] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To describe the mechanical characteristics of a novel angle-stable interlocking nail (NAS-ILN) and compare them to those of a locking compression plate (LCP) by using a gap-fracture model. STUDY DESIGN Experimental study. SAMPLE POPULATION Synthetic bone models. METHODS Synthetic bone models simulating a 50 mm diaphyseal comminuted canine tibial fracture were treated with either a novel angle-stable interlocking nail (NAS-ILN) or a locking compression plate (LCP). Maximal axial deformation and load to failure in compression and 4-point bending, as well as maximal angular deformation, slack, and torque to failure in torsion, were statistically compared (P < .05). RESULTS In compression, the maximal axial deformation was lower for NAS-ILN (0.11 mm ± 0.03) than for LCP (1.10 mm ± 0.22) (P < .0001). The ultimate load to failure was higher for NAS-ILN (803.58 N ± 29.52) than for LCP (328.40 N ± 11.01) (P < .0001). In torsion, the maximal angular deformation did not differ between NAS-ILN (22.79° ± 1.48) and LCP (24.36° ± 1.45) (P = .09). The ultimate torque to failure was higher for NAS-ILN (22.45 Nm ± 0.24) than for LCP (19.10 Nm ± 1.36) (P = .001). No slack was observed with NAS-ILN. In 4-point bending, the maximal axial deformation was lower for NAS-ILN (3.19 mm ± 0.49) than for LCP (4.17 mm ± 0.34) (P = .003). The ultimate bending moment was higher for NAS-ILN (25.73 Nm, IQR [23.54-26.86] Nm) than for LCP (16.29 Nm, IQR [15.66-16.47] Nm) (P = .002). CONCLUSION The NAS-ILN showed greater stiffness in compression and 4-point bending, and a greater resistance to failure in compression, torsion, and 4-point bending, than LCP. CLINICAL IMPACT Based on these results, NAS-ILNs could be considered as alternative implants for the stabilization of comminuted fractures.
Collapse
Affiliation(s)
- Julie Deprey
- Department of Small Animal Surgery, VetAgro Sup, Campus Vétérinaire de Lyon, Marcy l'Etoile, France.,Research Unit ICE, UPSP 2016-A104, Université de Lyon, VetAgro Sup, Marcy l'Etoile, France
| | - Margaux Blondel
- Department of Small Animal Surgery, VetAgro Sup, Campus Vétérinaire de Lyon, Marcy l'Etoile, France.,Research Unit ICE, UPSP 2016-A104, Université de Lyon, VetAgro Sup, Marcy l'Etoile, France
| | - Charles Saban
- Department of Small Animal Surgery, VetAgro Sup, Campus Vétérinaire de Lyon, Marcy l'Etoile, France.,Research Unit ICE, UPSP 2016-A104, Université de Lyon, VetAgro Sup, Marcy l'Etoile, France
| | - Michel Massenzio
- Univ Lyon, Université Claude Bernard Lyon 1, Univ Gustave Eiffel, IFSTTAR, Lyon, France
| | - Olivier Gauthier
- Department of Small Animal Surgery and Anesthesia, ONIRIS Nantes-Atlantic College of Veterinary Medicine, Food Science and Engineering, Nantes, France
| | - Pierre Moissonnier
- Department of Small Animal Surgery, VetAgro Sup, Campus Vétérinaire de Lyon, Marcy l'Etoile, France.,Research Unit ICE, UPSP 2016-A104, Université de Lyon, VetAgro Sup, Marcy l'Etoile, France
| | - Eric Viguier
- Department of Small Animal Surgery, VetAgro Sup, Campus Vétérinaire de Lyon, Marcy l'Etoile, France.,Research Unit ICE, UPSP 2016-A104, Université de Lyon, VetAgro Sup, Marcy l'Etoile, France
| | - Thibaut Cachon
- Department of Small Animal Surgery, VetAgro Sup, Campus Vétérinaire de Lyon, Marcy l'Etoile, France.,Research Unit ICE, UPSP 2016-A104, Université de Lyon, VetAgro Sup, Marcy l'Etoile, France
| |
Collapse
|
5
|
Yamauchi K, Magalhães T, Moi T, Sônego D, Pires M, Cunha O, Freitas S, Minto B. Treatment of a malunion of the tibia and fibula in a giant anteater (Myrmecophaga tridactyla). ARQ BRAS MED VET ZOO 2022. [DOI: 10.1590/1678-4162-12521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT Vehicle collisions involving giant anteaters contribute significantly to the decline of this population. Although mortality rates at the time of trauma are high, many animals survive despite severe trauma and limb fractures. Treating these individuals is extremely challenging. This report describes the use of a corrective osteotomy to treat an angular deformity caused by inadequate healing of a tibial and fibular fracture in a young giant anteater. The animal was rescued on a highway by the Brazilian Institute for the Environment and Renewable Natural Resources (Ibama). He was presented at the University Veterinary Hospital with lameness of the left pelvic limb and edema in the middle region of the tibial shaft. The radiographic examination showed an exuberant callus and significant bone deviation in the middle third of the left tibia and fibula. Corrective wedge osteotomy and fixation with a 3.5mm locking plate and 2.5mm intramedullary pin were performed. In the immediate postoperative period, there was functional recovery of the limb and complete consolidation of the osteotomy was identified 60 days after the operation. The corrective wedge osteotomy technique was effective for the treatment of inadequate tibial consolidation in a young giant anteater, providing complete recovery of all limb functions.
Collapse
Affiliation(s)
| | | | | | | | | | - O. Cunha
- Universidade Estadual Paulista, Brazil
| | | | | |
Collapse
|
6
|
DOUBLE PLATING FOR FRACTURES IN GIANT ANTEATERS ( MYRMECOPHAGA TRIDACTYLA). J Zoo Wildl Med 2021; 52:366-372. [PMID: 33827200 DOI: 10.1638/2020-0164] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2020] [Indexed: 11/21/2022] Open
Abstract
The fixation of fractures in wild animals has been a great challenge for veterinarians, because they will inevitably face a unique anatomical characteristic with scarce studies or reports published. Fracture fixation should promote adequate stability and early return to limb function, taking into account biomechanical characteristics of the bones, body weight, and natural habits of wildlife. Three bone fractures from two giant anteaters (Myrmecophaga tridactyla) referred at the veterinary teaching hospital on different occasions were treated by a double plating technique. The two free-ranging anteaters incurred their injuries when struck by an automobile. The first anteater (Ant 1) had a complete oblique fracture of the proximal third of the right femur and a complete comminuted fracture of the distal third of the right tibia. Surgical stabilization was performed by double plating to stabilize the femur and tibia. The second anteater (Ant 2) had a complete transverse fracture of the mid-diaphysis of the right radius and ulna, and it was fixed with a medial plate on the radius and a caudal plate on the ulna. The patients were able to walk 24 hr after the surgical procedures. Bone consolidation was observed at 60 days postoperatively, with no complications. The biggest challenges were related to anatomical characteristics for surgical approaches and the ability to promote a fixation strong enough to support the weight and strength of the animal, allowing early return to limb function.
Collapse
|
7
|
Minto B, Magalhães T, Lucena D, Soriano I, Barranco G, Dias L, Werther K. Humeral fracture repair using a robust fixation in an adult Giant Anteater (Myrmecophaga tridactyla): case report. ARQ BRAS MED VET ZOO 2021. [DOI: 10.1590/1678-4162-12184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT The treatment of fractures from the thoracic limb in giant anteaters is extremely challenging. Unfamiliar and peculiar anatomical characteristics, robust musculature and the imminent need for an early return to limb function highlight such challenges. The objective of this report was to describe the successful use of anatomical osteosynthesis with a robust locking compression plate in a humeral fracture of an adult giant anteater. The patient was rescued on the highway after being run over and presented for treatment at the Veterinary Teaching Hospital. Surgical stabilization was performed using a craniomedial approach to the humerus, using a customized broad 3.5mm locking compression plate. The patient presented early limb support at 24 hours postoperatively. Radiographic monitoring was performed at 30, 60 and 90 days postoperatively, and bone healing was observed without any complications. It is concluded that the treatment of humerus fractures in giant anteaters requires robust fixation. The use of a reinforced locking compression plate system proved to be effective and adequate to the mechanical load that an adult individual of this species needs for early use of the thoracic limb and, at the same time, efficient in controlling interfragmentary movement, which allowed fracture consolidation.
Collapse
|
8
|
Zhao X, Jing W, Yun Z, Tong X, Li Z, Yu J, Zhang Y, Zhang Y, Wang Z, Wen Y, Cai H, Wang J, Ma B, Zhao H. An experimental study on stress-shielding effects of locked compression plates in fixing intact dog femur. J Orthop Surg Res 2021; 16:97. [PMID: 33514429 PMCID: PMC7847147 DOI: 10.1186/s13018-021-02238-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 01/15/2021] [Indexed: 12/28/2022] Open
Abstract
Background In orthopedic application, stress-shielding effects of implant materials cause bone loss, which often induces porosis, delayed bone healing, and other complications. We aimed to compare the stress-shielding effects of locked compression plate (LCP) and limited-contact dynamic compression plate (LC-DCP) in dogs with plate-fixed femurs. Methods Bilateral intact femurs of 24 adult dogs were fixed by adult forearm 9-hole titanium plates using minimally invasive plate osteosynthesis (MIPPO) technology, with LCP on the left and LC-DCP on the right femurs. Dogs were sacrificed at 6 weeks, 12 weeks, and 24 weeks after surgery, and bone specimens were used to evaluate the efficacies of different fixing methods on bones through X-ray, dual-energy X-ray absorptiometry (DEXA), histology, MicroCT, and biomechanics analyses. Results X-ray results showed significant callus formation and periosteal reaction in the LC-DCP group. Bone cell morphology, degree of osteoporosis, and bone mineral density (BMD) changes of the LCP group were significantly better than that of the LC-DCP group. MicroCT results showed that the LCP group had significantly reduced degree of cortical bone osteoporosis than the LC-DCP group. Tissue mineral density (TMD) in the LCP group was higher than that in the LC-DCP group at different time points (6 weeks, 12 weeks, and 24 weeks). Biomechanics analyses demonstrated that the compressive strength and flexural strength of bones fixed by LCP were better than that by LC-DCP. Conclusions Stress-shielding effects of LCP are significantly weaker than that of LC-DCP, which is beneficial to new bone formation and fracture healing, and LCP can be widely used in clinic for fracture fixation.
Collapse
Affiliation(s)
- Xinwen Zhao
- Department of Joint Surgery, Yuncheng Hospital, The Eighth clinical Medical University, Shanxi province, 441000, China
| | - Wensen Jing
- Department of Orthopedics, Honghui Hospital, Xi'an Jiaotong University, 555 Youyi East Road, Beilin District, Xi'an, 710054, Shaanxi Province, China
| | - Zhe Yun
- Department of Orthopedics, 941st Hospital of PLAJLSF, Xining, 810000, Qinghai proviince, China
| | - Xun Tong
- Department of Traditional Chinese Medicine Rehabilitation and Physiotherapy, Xuzhou Army 71st Group Army Hospital, Xuzhou, 221000, Jiangsu province, China
| | - Zhao Li
- Department of Joint Surgery, Yuncheng Hospital, The Eighth clinical Medical University, Shanxi province, 441000, China
| | - Jiajia Yu
- Department of Joint Surgery, Yuncheng Hospital, The Eighth clinical Medical University, Shanxi province, 441000, China
| | - Yaohui Zhang
- Department of Joint Surgery, Yuncheng Hospital, The Eighth clinical Medical University, Shanxi province, 441000, China
| | - Yabin Zhang
- Institution of Orthopedics, Tangdu Hospital, Air Force Medical University, Xi'an, 710038, Shaanxi province, China
| | - Zhixue Wang
- Institution of Orthopedics, Tangdu Hospital, Air Force Medical University, Xi'an, 710038, Shaanxi province, China
| | - Yanhua Wen
- Institution of Orthopedics, Tangdu Hospital, Air Force Medical University, Xi'an, 710038, Shaanxi province, China
| | - Heping Cai
- School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an,710061 shaanxi province, China
| | - Jun Wang
- Center of Orthopedic laboratory, Xijing Hospital, Air Force Medical University, Xi'an, 710038, Shaanxi province, China
| | - Baoan Ma
- Institution of Orthopedics, Tangdu Hospital, Air Force Medical University, Xi'an, 710038, Shaanxi province, China.
| | - Haien Zhao
- Institution of Orthopedics, Tangdu Hospital, Air Force Medical University, Xi'an, 710038, Shaanxi province, China
| |
Collapse
|
9
|
Bassanino J, Kaczmarek J, Boursier JF, Mindner J, Paton R, Bedu AS, Unger M, Scharvogel S, Meiler D, Leperlier D. Radiographically confirmed outcomes after fracture repair with a PLS polyaxial locking system in 40 dogs and cats. Vet Surg 2021; 50:571-578. [PMID: 33480076 DOI: 10.1111/vsu.13578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 12/04/2020] [Accepted: 12/13/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To report radiographic findings and complications after fracture repair with a new polyaxial locking plate system (PLS polyaxial locking system; Aesculap/B Braun, Tuttlingen, Germany) in dogs and cats. STUDY DESIGN Retrospective case review from four veterinary practices. SAMPLE POPULATION Twenty-six dogs and 14 cats (40 long bone fractures). METHODS Medical and radiographic records of dogs and cats with long bone fractures treated with the PLS were reviewed. Cases were included when operative records were complete and included documentation of radiographic union or complications. Phone interviews of owners were performed for long-term follow-up. Ancillary methods of fracture fixation and associated complications were recorded. RESULTS Only two complications were recorded, one of which required a revision surgery. Radiographic follow-up was performed for all fractures. Radiographic union without complications was achieved in 38 of 40 (95%) fractures. Radiographic union was documented before 60 days in 19 of 40 (47.5%) fractures, between 61 and 90 days in 15 of 40 (37.5%) fractures, and after 90 days in six of 40 (15%) fractures. A functional union was observed at a mean time ± SD of 70.8 ± 38.9 days (range, 32-182). One or more ancillary fixation methods were used in 27 of 40 (67.5%) fractures. CONCLUSION The PLS polyaxial locking system was often used with adjunct fixation in this series, and radiographically confirmed healing without complications was documented in most cases. CLINICAL SIGNIFICANCE Use of the PLS can result in high success rates for fracture repair in dogs and cats, but ancillary fixation should be strongly considered.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Martin Unger
- AniCura Kleintierspezialisten, Augsburg, Germany
| | | | | | | |
Collapse
|
10
|
Bird G, Glyde M, Hosgood G, Hayes A, Day R. Biomechanical Comparison of a Notched Head Locking T-Plate and a Straight Locking Compression Plate in a Juxta-Articular Fracture Model. Vet Comp Orthop Traumatol 2020; 34:161-170. [PMID: 33249549 DOI: 10.1055/s-0040-1719166] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE This investigation compared the biomechanical properties of a 2.0 mm locking compression notched head T-plate (NHTP) and 2.0 mm straight locking compression plate (LCP), in a simple transverse juxta-articular fracture model. STUDY DESIGN Two different screw configurations were compared for the NHTP and LCP, modelling short (configuration 1) and long working length (configuration 2). Constructs were tested in compression, perpendicular and tension non-destructive four point bending and torsion. Plate surface strain was measured at 12 regions of interest (ROI) using three-dimensional digital image correlation. Stiffness and strain were compared between screw configurations within and between each plate. RESULTS The LCP was stiffer than the NHTP in all three planes of bending and torsion (p < 0.05). The NHTP had greater strain than the LCP during compression bending and torsion at all ROI (p < 0.0005). The short working length was stiffer in all three planes of bending and in torsion (p < 0.05) than the longer working length for both plates. The long working length showed greater strain than the short working length at most ROI. CONCLUSION In this experimental model, a 2.0 mm LCP with two screws in the short fragment was significantly stiffer and had lower plate strain than a 2.0 mm NHTP with three screws in the short fragment. Extending the working length significantly reduced construct stiffness and increased plate strain. These findings may guide construct selection.
Collapse
Affiliation(s)
- Guy Bird
- College of Veterinary Medicine, Murdoch University, Perth, Australia
| | - Mark Glyde
- College of Veterinary Medicine, Murdoch University, Perth, Australia
| | - Giselle Hosgood
- College of Veterinary Medicine, Murdoch University, Perth, Australia
| | - Alex Hayes
- Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Australia
| | - Robert Day
- Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Australia
| |
Collapse
|
11
|
Deprey J, Blondel M, Baldinger A, Gauthier O, Hée J, Moissonnier P, Viguier E, Carozzo C, Cachon T. In vitro comparison on a gap fracture model of a novel angle-stable interlocking nail to locking plate fixation in torsion, compression and bending. Comput Methods Biomech Biomed Engin 2020. [DOI: 10.1080/10255842.2020.1812166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- J. Deprey
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| | - M. Blondel
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| | - A. Baldinger
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| | - O. Gauthier
- Department of Small Animal Surgery and Anesthesia, ONIRIS Nantes-Atlantic College of Veterinary Medicine, Food Science and Engineering, Nantes, France
| | | | - P. Moissonnier
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| | - E. Viguier
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| | - C. Carozzo
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| | - T. Cachon
- Surgery Unit, Lyon Veterinary Teaching Hospital, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
- Reseach Unit ICE, UPSP A104-2016, University of Lyon, Veterinary Campus of Vetagro Sup, Marcy L’Etoile, France
| |
Collapse
|
12
|
The risk of loosening of extramedullary fracture fixation devices. Injury 2019; 50 Suppl 1:S66-S72. [PMID: 30955874 DOI: 10.1016/j.injury.2019.03.051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 03/28/2019] [Indexed: 02/02/2023]
Abstract
Extramedullary devices that use screws, pins or wires are used extensively to treat fractures in normal and diseased bone. A common failure mode is implant loosening at the bone-screw/pin/wire interface before fracture healing occurs. This review first considers the fundamental mechanics of the bone-fixator construct with focus on interfacial strains that result in loosening. It then evaluates the time-independent and time-dependent material models of bone that have been used to simulate and predict loosening. It is shown that the recently developed time-dependent models are capable of predicting loosening due to cyclic loads in bone of varying quality.
Collapse
|
13
|
SURGICAL MANAGEMENT OF APPENDICULAR LONG-BONE FRACTURES IN FREE-RANGING FLORIDA PANTHERS ( PUMA CONCOLOR CORYI): SIX CASES (2000-2014). J Zoo Wildl Med 2018. [PMID: 29517460 DOI: 10.1638/2017-0058r1.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The clinical outcomes of six free-ranging Florida panthers ( Puma concolor coryi) that underwent surgical stabilization of appendicular long-bone fractures (three femoral fractures, one tibial and one tibial and fibular fracture and two radial and ulnar fractures) were evaluated. These panthers presented to the University of Florida from 2000-2014. Estimated age of the panthers ranged from 0.5 to 4.5 yr, and weights ranged from 22 to 65 kg. Causes of injuries were vehicular collision ( n = 4) and capture related ( n = 2). All panthers underwent open reduction and fracture stabilization. Fixation failure necessitated three subsequent surgeries in one panther. Five panthers survived the immediate postoperative period, and all of these panthers' fractures obtained radiographic union (range, 8-36 [mean, 22] wk). The five surviving panthers underwent convalescence for 7-14 mo at White Oak Conservation Center before being released back into the wild; however, one panther was killed when hit by a car 3 days after release. The remaining four panthers were tracked for up to 106 mo in the wild and successfully integrated back into the native population. Surgical stabilization of appendicular long-bone fractures in free-ranging Florida panthers can be successful, but must take into account the stress that a large, undomesticated felid will place on the stabilized limb during convalescence as well as the difficulties involved in rehabilitating a wild panther in captivity.
Collapse
|
14
|
MacLeod A, Simpson AHRW, Pankaj P. Experimental and numerical investigation into the influence of loading conditions in biomechanical testing of locking plate fracture fixation devices. Bone Joint Res 2018; 7:111-120. [PMID: 29363522 PMCID: PMC5805837 DOI: 10.1302/2046-3758.71.bjr-2017-0074.r2] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Objectives Secondary fracture healing is strongly influenced by the stiffness of the bone-fixator system. Biomechanical tests are extensively used to investigate stiffness and strength of fixation devices. The stiffness values reported in the literature for locked plating, however, vary by three orders of magnitude. The aim of this study was to examine the influence that the method of restraint and load application has on the stiffness produced, the strain distribution within the bone, and the stresses in the implant for locking plate constructs. Methods Synthetic composite bones were used to evaluate experimentally the influence of four different methods of loading and restraining specimens, all used in recent previous studies. Two plate types and three screw arrangements were also evaluated for each loading scenario. Computational models were also developed and validated using the experimental tests. Results The method of loading was found to affect the gap stiffness strongly (by up to six times) but also the magnitude of the plate stress and the location and magnitude of strains at the bone-screw interface. Conclusions This study demonstrates that the method of loading is responsible for much of the difference in reported stiffness values in the literature. It also shows that previous contradictory findings, such as the influence of working length and very large differences in failure loads, can be readily explained by the choice of loading condition. Cite this article: A. MacLeod, A. H. R. W. Simpson, P. Pankaj. Experimental and numerical investigation into the influence of loading conditions in biomechanical testing of locking plate fracture fixation devices. Bone Joint Res 2018;7:111–120. DOI: 10.1302/2046-3758.71.BJR-2017-0074.R2.
Collapse
Affiliation(s)
| | - A H R W Simpson
- Department of Orthopaedic Surgery, University of Edinburgh, Chancellor's Building, 49 Little France Crescent, Old Dalkeith Road, Edinburgh EH16 4SB, UK
| | - P Pankaj
- The University of Edinburgh, School of Engineering, Institute for Bioengineering, Faraday Building, Edinburgh EH9 3DW, UK
| |
Collapse
|