Factores asociados con complicaciones mediatas en pacientes postoperados de fracturas transtrocantéricas con sistema de tornillo dinámico de cadera de 135&lt;sup&gt;o&lt;/sup&gt;

Hernández-Pozos, L; Reyes-Martínez, F; Bernal-Camarillo, V E; Lagunas-Sánchez, CE

doi:10.35366/105705

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…[8,9] In some cases, who cannot be recognized in advance with certainty, absence of the dynamization may lead to mechanical complications, such as cut-out, implant breakage or xation failure. [10,11,12] The compression between fracture fragments, as a result of the dynamization, is considered an important promoting factor in the process of a new bone remodelling to a morphological structure being most resistant to the local biomechanical forces. [13,14] Single limb support phase accounts for about 40% of the gait-cycle.…”

Section: Introductionmentioning

confidence: 99%

Forces required to dynamize sliding screws in Gamma Nail and Selfdynamizable Internal Fixator

Mitkovic,

Korunovic,

Milenkovic

et al. 2023

Preprint

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Background: Single limb support phase of the gait-cycle in patients who are treated for a pertrochanteric fracture is characterized by transversal loads acting on the lag screw, tending to block its dynamization. If the simultaneous axial force overcomes transversal loads of the sliding screw, the dynamization can still occur. Methods: Biomechanical investigation was performed for three types of dynamic implants: Gamma Nail, and two types of Selfdynamizable Internal Fixators (SIF) – SIF-7 (containing two 7 mm non-cannulated sliding screws), and SIF-10 (containing one 10 mm cannulated sliding screw). Contact surface between the stem and the sliding screws is larger in SIF implants then in Gamma Nail, as the stem of Gamma Nail is hollow. A special testing device was designed for this study to provide simultaneous application of a controlled sliding screws bending moment and a controlled transversal load on sliding screws (Qt) without using of weights. Using each of the implants, axial forces required to initiate sliding screws dynamization (Qa) were applied and measured using a tensile testing machine, for several values of sliding screws bending moment. Standard least-squares method was used to present the results through the linear regression model. Results: Positive correlation between Qt and Qa was approved (p<0.05). While performing higher bending moments in all the tested implants, Qa was higher than it could be provided by the body weight. It was the highest in Gamma Nail, and the lowest in SIF-10. Conclusions: A larger contact surface between a sliding screw and stem results in lower forces required to initiate dynamization of a sliding screw. Patients treated for a pertrochanteric fracture by a sliding screw internal fixation who have longer femoral neck or higher body weight could have different programme of early postoperative rehabilitation than lighter patients or patients with shorter femoral neck.

show abstract

Section: Introductionmentioning

confidence: 99%

Forces required to dynamize sliding screws in Gamma Nail and Selfdynamizable Internal Fixator

Mitkovic,

Korunovic,

Milenkovic

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Forces required to dynamize sliding screws in gamma nail and selfdynamizable internal fixator

Mitkovic,

Korunovic,

Milenkovic

et al. 2024

BMC Musculoskelet Disord

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Background Single limb support phase of the gait-cycle in patients who are treated for a pertrochanteric fracture is characterized by transversal loads acting on the lag screw, tending to block its dynamization. If the simultaneous axial force overcomes transversal loads of the sliding screw, the dynamization can still occur. Methods Biomechanical investigation was performed for three types of dynamic implants: Gamma Nail, and two types of Selfdynamizable Internal Fixators (SIF) – SIF-7 (containing two 7 mm non-cannulated sliding screws), and SIF-10 (containing one 10 mm cannulated sliding screw). Contact surface between the stem and the sliding screws is larger in SIF implants than in Gamma Nail, as the stem of Gamma Nail is hollow. A special testing device was designed for this study to provide simultaneous application of a controlled sliding screws bending moment and a controlled transversal load on sliding screws (Qt) without using of weights. Using each of the implants, axial forces required to initiate sliding screws dynamization (Qa) were applied and measured using a tensile testing machine, for several values of sliding screws bending moment. Standard least-squares method was used to present the results through the linear regression model. Results Positive correlation between Qt and Qa was confirmed (p < 0.05). While performing higher bending moments in all the tested implants, Qa was higher than it could be provided by the body weight. It was the highest in Gamma Nail, and the lowest in SIF-10. Conclusions A larger contact surface between a sliding screw and stem results in lower forces required to initiate dynamization of a sliding screw. Patients treated for a pertrochanteric fracture by a sliding screw internal fixation who have longer femoral neck or higher body weight could have different programme of early postoperative rehabilitation than lighter patients or patients with shorter femoral neck.

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Factores asociados con complicaciones mediatas en pacientes postoperados de fracturas transtrocantéricas con sistema de tornillo dinámico de cadera de 135<sup>o</sup>

Cited by 2 publications

References 14 publications

Forces required to dynamize sliding screws in Gamma Nail and Selfdynamizable Internal Fixator

Forces required to dynamize sliding screws in Gamma Nail and Selfdynamizable Internal Fixator

Forces required to dynamize sliding screws in gamma nail and selfdynamizable internal fixator

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