The influence of proximal stem geometry and surface finish on the fixation of a double-tapered cemented femoral stem

Sangiorgio, Sophia N.; Longjohn, Donald B.; Dorr, Lawrence D.; Ebramzadeh, Edward

doi:10.1016/j.jbiomech.2010.08.017

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…The distal cross‐sections of the prostheses shifted to the proximal cross‐sections along the profiles of the prostheses. Therefore, the profiles not only control the load transfer mechanism from the hip joint to the bone but also affect prosthetic stiffness (rigidity) and accordingly SE. The interface properties elicited no significant effect on SE because the prosthetic stiffness is independent of the interface properties.…”

Section: Resultsmentioning

confidence: 99%

Effect of Geometrical Parameters on the Performance of Longitudinal Functionally Graded Femoral Prostheses

et al. 2014

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This study aimed to assess the performance of different longitudinal functionally graded femoral prostheses. This study was also designed to develop an appropriate prosthetic geometric design for longitudinal functionally graded materials. Three-dimensional models of the femur and prostheses were developed and analyzed. The elastic modulus of these prostheses in the sagittal plane was adjusted along a gradient direction from the distal end to the proximal end. Furthermore, these prostheses were composed of titanium alloy and hydroxyapatite. Results revealed that strain energy, interface stress, and developed stress in the femoral prosthesis and the bone were influenced by prosthetic geometry and gradient index. In all of the prostheses with different geometries, strain energy increased as gradient index increased. Interface stress and developed stress decreased. The minimum principal stress and the maximum principal stress of the bone slightly increased as gradient index increased. Hence, the combination of the femoral prosthetic geometry and functionally graded materials can be employed to decrease stress shielding. Such a combination can also be utilized to achieve equilibrium in terms of the stress applied on the implanted femur constituents; thus, the lifespan of total hip replacement can be prolonged.

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Section: Resultsmentioning

confidence: 99%

Effect of Geometrical Parameters on the Performance of Longitudinal Functionally Graded Femoral Prostheses

et al. 2014

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“…Composite anatomic tibias, designed and validated for the purpose of biomechanical testing, were used to minimize specimen variability and increase the precision of the experiments in detecting differences due to fracture pattern or implant configuration (Medium Tibia 3401; Sawbones). [25][26][27][28][29][30][31][32][33] Dynax IMNs were designed by the primary author (US Patent WO2014075025A1) and fabricated using Ti-6Al-4V alloy (Mount Mfg). Each nail contains a titanium alloy spring (Orlando Spring) with a constant of 32.2 N/mm, which allows axial motion between the two parts of the nail (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A novel intramedullary nail to control interfragmentary motion in diaphyseal tibial fractures

Ziran

McCarty

et al. 2021

Journal Orthopaedic Research

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Numerous animal and human studies have demonstrated the benefit of controlled interfragmentary motion on fracture healing. In this study, we quantified interfragmentary motion and load transfer in tibial fractures fixed using a novel intramedullary nail (IMN) that allows controlled axial motion. Fifty composite tibias with various fracture patterns were utilized. For all test conditions, two interlocking screws were used to fix the nail in the proximal metaphysis, and two interlocking screws through the distal metaphysis. The nail allowed either no motion (static mode) or 1 mm (dynamic mode) of cyclic axial motion between the two fracture fragments for every fracture pattern tested. As expected, strain shielding was more prominent under static nail conditions. In contrast, specimens tested under dynamic nail conditions transferred axial load between the fracture fragments such that strains near the fracture site were generally similar to those measured on an intact tibia. Maximum shear strains proximal to the fracture were significantly lower in specimens with oblique or butterfly fracture patterns (p < 0.01) compared to intact specimens. This decrease in shear strain indicates that strain shielding effects were likely present due to the implant. However, strain shielding appeared to be reduced in tensile and compressive principal strains. In summary, the novel IMN allowed controlled axial motion between the fragments in a variety of common diaphyseal tibial fracture patterns. Clinical Significance: The present in vitro biomechanical study investigated a novel intramedullary nail capable of controlled axial interfragmentary motion which may potentially enhance fracture healing.

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“…Composite anatomic first metatarsal and medial cuneiform bones were designed and created by Sawbones, Pacific Research Laboratories for the purpose of this study. Similar to composite femurs, tibias, and other synthetic models available through Sawbones, and validated by numerous studies, [12][13][14][15][16] each bone was fabricated from a reinforced epoxy resin designed to simulate the mechanical properties of cortical bone, and polyurethane foam with appropriate density to simulate the mechanical properties of cancellous bone. The thickness of the epoxy resin used to mimic the outer cortical bone shell was determined based on radiographs of cadaveric specimens taken at our institution.…”

Section: Methodsmentioning

confidence: 99%

Biomechanical Comparison of Fixation Devices for First Metatarsocuneiform Joint Arthrodesis

Knutsen

Fleming

Ebramzadeh

et al. 2016

Foot & Ankle Specialist

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The influence of proximal stem geometry and surface finish on the fixation of a double-tapered cemented femoral stem

Cited by 7 publications

References 34 publications

Effect of Geometrical Parameters on the Performance of Longitudinal Functionally Graded Femoral Prostheses

Effect of Geometrical Parameters on the Performance of Longitudinal Functionally Graded Femoral Prostheses

A novel intramedullary nail to control interfragmentary motion in diaphyseal tibial fractures

Biomechanical Comparison of Fixation Devices for First Metatarsocuneiform Joint Arthrodesis

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