Erik N Mayer, Matin Lendhey, Ben Kelley, Brendan Shi, Alexander Upfill-Brown, Sai K. Devana, D. Brodke, Akash A Shah, Troy Sekimura, Varun Gudapati, Brian Zukotynski, Jeannie Park, Amber R. Witt, Mara Marciante, Jonathan M. Mahoney, Brandon S Bucklen, Christopher Lee
{"title":"The Effects of Unitizing Nail-Plate Constructs in Distal Femur Fractures: A Biomechanical Study","authors":"Erik N Mayer, Matin Lendhey, Ben Kelley, Brendan Shi, Alexander Upfill-Brown, Sai K. Devana, D. Brodke, Akash A Shah, Troy Sekimura, Varun Gudapati, Brian Zukotynski, Jeannie Park, Amber R. Witt, Mara Marciante, Jonathan M. Mahoney, Brandon S Bucklen, Christopher Lee","doi":"10.1097/bot.0000000000002839","DOIUrl":null,"url":null,"abstract":"\n \n To assess the biomechanical differences between linked and unlinked constructs in young and osteoporotic cadavers in addition to osteoporotic sawbones.\n \n \n \n Intraarticular distal femur fractures with comminuted metaphyseal regions were created in three young matched pair cadavers, three osteoporotic matched pair cadavers, and six osteoporotic sawbones. Precontoured distal femur locking plates were placed in addition to a standardized retrograde nail, with unitized constructs having one 4.5 mm locking screw placed distally through the nail. Nonunitized constructs had seven 4.5 mm locking screws placed through the plate around the nail, with one 5 mm distal interlock placed through the nail alone. Cadaveric specimens were subjected to axial fatigue loads between 150 and 1500 N (R Ratio = 10) with 1 Hx frequency for 10,000 cycles. Sawbones were axially loaded at 50% of the ultimate load for fatigue testing to achieve runout, with testing performed with 30 and 300 N (R Ratio = 10) loads with 1 Hz frequency for 10,000 cycles.\n \n \n \n In young cadavers, there was no difference in the mean cyclic displacement of the unitized constructs (1.51 ± 0.62mm) compared to the non-unitized constructs (1.34 ± 0.47mm) (Figure 4A), (p = 0.722). In osteoporotic cadavers, there was no difference in the mean cyclic displacement of the unitized constructs (2.46 ± 0.47mm) compared to the non-unitized constructs (2.91 ± 1.49mm) (p=0.639). There was statistically no significant difference in cyclic displacement between the unitized and non-unitized groups in osteoporotic sawbones(p = 0.181)\n \n \n \n Linked constructs did not demonstrate increased axial stiffness or decreased cyclical displacement in comparison to unlinked constructs in young cadaveric specimens, osteoporotic cadaveric specimens, or osteoporotic sawbones.\n","PeriodicalId":16644,"journal":{"name":"Journal of Orthopaedic Trauma","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Orthopaedic Trauma","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1097/bot.0000000000002839","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ORTHOPEDICS","Score":null,"Total":0}
引用次数: 0
Abstract
To assess the biomechanical differences between linked and unlinked constructs in young and osteoporotic cadavers in addition to osteoporotic sawbones.
Intraarticular distal femur fractures with comminuted metaphyseal regions were created in three young matched pair cadavers, three osteoporotic matched pair cadavers, and six osteoporotic sawbones. Precontoured distal femur locking plates were placed in addition to a standardized retrograde nail, with unitized constructs having one 4.5 mm locking screw placed distally through the nail. Nonunitized constructs had seven 4.5 mm locking screws placed through the plate around the nail, with one 5 mm distal interlock placed through the nail alone. Cadaveric specimens were subjected to axial fatigue loads between 150 and 1500 N (R Ratio = 10) with 1 Hx frequency for 10,000 cycles. Sawbones were axially loaded at 50% of the ultimate load for fatigue testing to achieve runout, with testing performed with 30 and 300 N (R Ratio = 10) loads with 1 Hz frequency for 10,000 cycles.
In young cadavers, there was no difference in the mean cyclic displacement of the unitized constructs (1.51 ± 0.62mm) compared to the non-unitized constructs (1.34 ± 0.47mm) (Figure 4A), (p = 0.722). In osteoporotic cadavers, there was no difference in the mean cyclic displacement of the unitized constructs (2.46 ± 0.47mm) compared to the non-unitized constructs (2.91 ± 1.49mm) (p=0.639). There was statistically no significant difference in cyclic displacement between the unitized and non-unitized groups in osteoporotic sawbones(p = 0.181)
Linked constructs did not demonstrate increased axial stiffness or decreased cyclical displacement in comparison to unlinked constructs in young cadaveric specimens, osteoporotic cadaveric specimens, or osteoporotic sawbones.
期刊介绍:
Journal of Orthopaedic Trauma is devoted exclusively to the diagnosis and management of hard and soft tissue trauma, including injuries to bone, muscle, ligament, and tendons, as well as spinal cord injuries. Under the guidance of a distinguished international board of editors, the journal provides the most current information on diagnostic techniques, new and improved surgical instruments and procedures, surgical implants and prosthetic devices, bioplastics and biometals; and physical therapy and rehabilitation.