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Related Concept Videos

Stresses in a Shaft01:18

Stresses in a Shaft

884
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
884
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

921
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
921
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

509
Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
509
Design of Transmission Shafts01:16

Design of Transmission Shafts

782
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
782
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

566
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
566
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

567
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
567

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Related Experiment Video

Updated: Jan 31, 2026

Orthopedic Robot-Assisted Femoral Neck System in the Treatment of Femoral Neck Fracture
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[Femoral shaft fractures].

T Gösling1, C Krettek2

  • 1Klinik für Unfallchirurgie und Orthopädische Chirurgie, Städtisches Klinikum Braunschweig gGmbH, Holwedestr. 16, 38118, Braunschweig, Deutschland. t.goesling@klinikum-braunschweig.de.

Der Unfallchirurg
|January 9, 2019
PubMed
Summary

This article discusses femoral shaft fractures in adults, focusing on causes like high-velocity trauma and specific fracture types. It also touches upon rare gunshot-related fractures and atypical bisphosphonate-induced fractures.

Keywords:
Damage control orthopaedicsExternal fixationFemur shaft fractureIntramedulary nailingPolytrauma

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Area of Science:

  • Orthopedic Surgery
  • Trauma Medicine
  • Bone Biology

Background:

  • Femoral shaft fractures primarily impact young adults with healthy bone structures.
  • Common causes include high-velocity trauma from traffic accidents, crushing injuries, or falls from significant heights.
  • Gunshot wounds, though less common in Germany, hold relevance in international and military contexts.

Purpose of the Study:

  • To characterize the epidemiology and common fracture patterns of femoral shaft fractures in adults.
  • To differentiate typical traumatic fractures from less common etiologies like gunshot wounds and bisphosphonate-related fractures.
  • To provide an overview of fracture types, including transverse, wedge, segmentary, and comminuted fractures.

Main Methods:

  • Review of existing literature and clinical data on femoral shaft fractures.
  • Classification of fracture types based on morphology and proposed mechanisms of injury.
  • Discussion of etiological factors, including trauma mechanisms and specific patient populations.

Main Results:

  • High-velocity trauma is the predominant cause of femoral shaft fractures in young, healthy individuals.
  • Transverse, wedge, segmentary, and comminuted fractures are the most frequent types observed.
  • Spiral fractures suggest indirect force, often seen in osteoporotic bone, while atypical subtrochanteric fractures are associated with bisphosphonate use.

Conclusions:

  • Femoral shaft fractures in adults are typically caused by significant trauma, with varied fracture patterns.
  • Understanding fracture etiology and type is crucial for appropriate management.
  • Atypical bisphosphonate-related fractures represent a distinct clinical entity requiring specific consideration.