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Nizar N. Mahomed - One of the best experts on this subject based on the ideXlab platform.
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Fixation of segmental subtrochanteric fractures. A biomechanical study.
Clinical orthopaedics and related research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 +/- 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 +/- 490 N), and the long Intramedullary rod hip screw (2181 +/- 244 N). The failure modes for the implants were: screw cut out of the femoral head for the reconstruction nail; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
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Fixation of segmental subtrochanteric fractures : A biomechanical study : Topics in lower limb trauma
Clinical Orthopaedics and Related Research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 ± 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 + 490 N), and the long Intramedullary rod hip screw (2181 ± 244 N). The failure modes for the implants were : screw cut out of the femoral head for the reconstruction nail ; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
W. J. Kraemer - One of the best experts on this subject based on the ideXlab platform.
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Fixation of segmental subtrochanteric fractures. A biomechanical study.
Clinical orthopaedics and related research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 +/- 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 +/- 490 N), and the long Intramedullary rod hip screw (2181 +/- 244 N). The failure modes for the implants were: screw cut out of the femoral head for the reconstruction nail; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
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Fixation of segmental subtrochanteric fractures : A biomechanical study : Topics in lower limb trauma
Clinical Orthopaedics and Related Research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 ± 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 + 490 N), and the long Intramedullary rod hip screw (2181 ± 244 N). The failure modes for the implants were : screw cut out of the femoral head for the reconstruction nail ; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
George I. Jallo - One of the best experts on this subject based on the ideXlab platform.
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Primary Intramedullary Spinal Germ Cell Tumors
World Neurosurgery, 2011Co-Authors: Vivek A. Mehta, Ryan M. Kretzer, Brent A. Orr, George I. JalloAbstract:Background Intramedullary spinal germ cell tumors are rare lesions, with germinomas being the most common variant. Methods To date, there have been 23 reports of primary Intramedullary germ cell tumors described in the literature, the vast majority occurring in Japanese patients. Results We present a case of a nonmetastatic Intramedullary germ cell tumor in a 28-year-old Caucasian woman. Conclusions Characteristics of Intramedullary germ cell tumors are summarized, and the current role for surgery and adjuvant radiation and chemotherapy are discussed.
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Primary Intramedullary spinal germ cell tumors.
World neurosurgery, 2011Co-Authors: Vivek A. Mehta, Ryan M. Kretzer, Brent Orr, George I. JalloAbstract:Intramedullary spinal germ cell tumors are rare lesions, with germinomas being the most common variant. To date, there have been 23 reports of primary Intramedullary germ cell tumors described in the literature, the vast majority occurring in Japanese patients. We present a case of a nonmetastatic Intramedullary germ cell tumor in a 28-year-old Caucasian woman. Characteristics of Intramedullary germ cell tumors are summarized, and the current role for surgery and adjuvant radiation and chemotherapy are discussed. Copyright © 2011 Elsevier Inc. All rights reserved.
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Pediatric Intramedullary spinal cavernous malformations.
Spine, 2001Co-Authors: Harel Deutsch, Raj Shrivistava, Fred Epstein, George I. JalloAbstract:Study Design. A retrospective analysis of a large single institution pediatric Intramedullary tumor database. The database was searched for all pediatric Intramedullary cavernous malformations. Objectives. To review the authors’ experience with three pediatric Intramedullary cavernous malformations, review the previous literature, and discuss the surgical management for these rare lesions. Summary of Background Data. Cavernous malformations can occur throughout the central nervous system; however, the Intramedullary spinal cord is a rare location. More recent estimates indicate that cavernous malformations constitute 5% of all vascular malformations. There is no series that reports the management of pediatric Intramedullary cavernous malformations. Methods. There were 181 pediatric Intramedullary lesions in the tumor database. A review revealed three children with a mean age of 13.3 years (range, 8–19 years) with Intramedullary cavernous malformations. All these children presented with an acute motor deficit that prompted radiographic imaging and diagnosis. All the children underwent laminectomy and gross total removal of the lesion. All the malformations abutted the dorsal pial surface and created a blue discoloration, which was evident after opening the dura. Results. Approximately 10% of all Intramedullary cavernous malformations present in the pediatric population. Pediatric lesions, unlike those in adults, have an acute presentation, and the lesions are typically found in the cervical region. The surgical removal of these malformations results in a good functional outcome. The entire neuraxis should be screened because there is a high incidence of multiple lesions. Conclusions. The surgical removal of these malformations results in a good functional outcome. The entire neuraxis should be screened because there is a high incidence of multiple lesions.
T. Hearn - One of the best experts on this subject based on the ideXlab platform.
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Fixation of segmental subtrochanteric fractures. A biomechanical study.
Clinical orthopaedics and related research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 +/- 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 +/- 490 N), and the long Intramedullary rod hip screw (2181 +/- 244 N). The failure modes for the implants were: screw cut out of the femoral head for the reconstruction nail; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
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Fixation of segmental subtrochanteric fractures : A biomechanical study : Topics in lower limb trauma
Clinical Orthopaedics and Related Research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 ± 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 + 490 N), and the long Intramedullary rod hip screw (2181 ± 244 N). The failure modes for the implants were : screw cut out of the femoral head for the reconstruction nail ; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
J. N. Powell - One of the best experts on this subject based on the ideXlab platform.
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Fixation of segmental subtrochanteric fractures. A biomechanical study.
Clinical orthopaedics and related research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 +/- 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 +/- 490 N), and the long Intramedullary rod hip screw (2181 +/- 244 N). The failure modes for the implants were: screw cut out of the femoral head for the reconstruction nail; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
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Fixation of segmental subtrochanteric fractures : A biomechanical study : Topics in lower limb trauma
Clinical Orthopaedics and Related Research, 1996Co-Authors: W. J. Kraemer, T. Hearn, J. N. Powell, Nizar N. MahomedAbstract:Segmental subtrochanteric fractures have been associated with high rates of malunion, nonunion, and implant failure. Although the use of second generation Intramedullary nails with proximal interlocking in the femoral head has been advocated for these fractures, shaft fractures at the tip of short second generation Intramedullary rod nails in clinical studies raise concerns about the mechanical suitability of these implants. No biomechanical data are available on the strength of fixation and mode of failure of these newer implants. This study compares the strength and failure mode of segmental subtrochanteric fractures stabilized with 3 current implants. Eighteen anatomic specimen femurs were obtained. The 3 implants tested were the Russell-Taylor reconstruction nail, a short Intramedullary hip screw, and a long Intramedullary hip screw. Each femur was instrumented and a segmental subtrochanteric fracture was created. The femurs were loaded in a Materials Testing System. The strength of the reconstruction nail group (2869 ± 210 N) was significantly greater than for the short Intramedullary rod hip screw (2330 + 490 N), and the long Intramedullary rod hip screw (2181 ± 244 N). The failure modes for the implants were : screw cut out of the femoral head for the reconstruction nail ; fracture of the femoral shaft for the short Intramedullary hip screw, and implant bending for the long Intramedullary hip screw. This study suggests that the reconstruction nail is the superior implant for segmental subtrochanteric fractures of those tested. Implant bending and shaft fractures at lower loads make the 2 Intramedullary rod hip screw implants less suitable.
