The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics
Ten percent of the 250,000 proximal femur fractures that occur in the United States each year are malreduced into a varus position after treatment. Currently, there is no cephalomedullary nail available that allows the physician to dynamically change the lag-screw-to-nail angle. The Variable Angle N...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Advances in Orthopedics |
| Online Access: | http://dx.doi.org/10.1155/2013/143801 |
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| _version_ | 1849307729804394496 |
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| author | Amir Matityahu Andrew H. Schmidt Alan Grantz Ben Clawson Meir Marmor R. Trigg McClellan |
| author_facet | Amir Matityahu Andrew H. Schmidt Alan Grantz Ben Clawson Meir Marmor R. Trigg McClellan |
| author_sort | Amir Matityahu |
| collection | DOAJ |
| description | Ten percent of the 250,000 proximal femur fractures that occur in the United States each year are malreduced into a varus position after treatment. Currently, there is no cephalomedullary nail available that allows the physician to dynamically change the lag-screw-to-nail angle. The Variable Angle Nail (VAN) was designed to allow movement of the lag screw relative to the shaft of the nail. This study compared the characteristics of the VAN to the Gamma 3 nail via finite element analysis (FEA) in stiffness and fatigue. The results of the FEA model with the same loading parameters showed the Gamma 3 and the VAN with lag-screw-to-nail angle of 120° to have essentially the same stiffness values ranging from 350 to 382 N/mm. The VAN with lag-screw-to-nail angles of 120°, 130°, and 140° should be able to withstand more than 1,000,000 cycles from 1,400 N to 1,500 N loading of the tip of the lag screw. The Gamma 3 should be able to last more than 1,000,000 cycles at 1,400 N. In summary, the VAN is superior or equivalent in stiffness and fatigue when compared to the Gamma 3 using FEA. |
| format | Article |
| id | doaj-art-1dac52a19a634437b890d1d5fce9aada |
| institution | Kabale University |
| issn | 2090-3464 2090-3472 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Orthopedics |
| spelling | doaj-art-1dac52a19a634437b890d1d5fce9aada2025-08-20T03:54:38ZengWileyAdvances in Orthopedics2090-34642090-34722013-01-01201310.1155/2013/143801143801The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue CharacteristicsAmir Matityahu0Andrew H. Schmidt1Alan Grantz2Ben Clawson3Meir Marmor4R. Trigg McClellan5Department of Orthopaedic Surgery, UCSF/SFGH Orthopaedic Trauma Institute, 2550 23rd Street, 2nd Floor, San Francisco, CA 94110, USADepartment of Orthopaedic Surgery, University of Minnesota, Hennapin County Medical Center, Minneapolis, MN 55454, USAAnthem Orthopaedics VAN, LLC, Santa Cruz, CA 95060, USAAnthem Orthopaedics VAN, LLC, Santa Cruz, CA 95060, USADepartment of Orthopaedic Surgery, UCSF/SFGH Orthopaedic Trauma Institute, 2550 23rd Street, 2nd Floor, San Francisco, CA 94110, USADepartment of Orthopaedic Surgery, UCSF/SFGH Orthopaedic Trauma Institute, 2550 23rd Street, 2nd Floor, San Francisco, CA 94110, USATen percent of the 250,000 proximal femur fractures that occur in the United States each year are malreduced into a varus position after treatment. Currently, there is no cephalomedullary nail available that allows the physician to dynamically change the lag-screw-to-nail angle. The Variable Angle Nail (VAN) was designed to allow movement of the lag screw relative to the shaft of the nail. This study compared the characteristics of the VAN to the Gamma 3 nail via finite element analysis (FEA) in stiffness and fatigue. The results of the FEA model with the same loading parameters showed the Gamma 3 and the VAN with lag-screw-to-nail angle of 120° to have essentially the same stiffness values ranging from 350 to 382 N/mm. The VAN with lag-screw-to-nail angles of 120°, 130°, and 140° should be able to withstand more than 1,000,000 cycles from 1,400 N to 1,500 N loading of the tip of the lag screw. The Gamma 3 should be able to last more than 1,000,000 cycles at 1,400 N. In summary, the VAN is superior or equivalent in stiffness and fatigue when compared to the Gamma 3 using FEA.http://dx.doi.org/10.1155/2013/143801 |
| spellingShingle | Amir Matityahu Andrew H. Schmidt Alan Grantz Ben Clawson Meir Marmor R. Trigg McClellan The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics Advances in Orthopedics |
| title | The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics |
| title_full | The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics |
| title_fullStr | The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics |
| title_full_unstemmed | The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics |
| title_short | The Variable Angle Hip Fracture Nail Relative to the Gamma 3: A Finite Element Analysis Illustrating the Same Stiffness and Fatigue Characteristics |
| title_sort | variable angle hip fracture nail relative to the gamma 3 a finite element analysis illustrating the same stiffness and fatigue characteristics |
| url | http://dx.doi.org/10.1155/2013/143801 |
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