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Related Concept Videos

Bearing Stress01:22

Bearing Stress

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Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
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Stresses in a Shaft01:18

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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...
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Fractures: Bone Repair01:27

Fractures: Bone Repair

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
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Normal Stress01:19

Normal Stress

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Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
When a rod is under axial loading, the internal forces and corresponding stress are normal to the plane of the section, so it is termed normal stress. It's important to...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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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...
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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

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When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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Navicular Stress Fractures.

Karan A Patel1, Zachary K Christopher, Mark C Drakos

  • 1From the Department of Orthopaedic Surgery, Mayo Clinic Arizona, Phoenix, AZ (Patel, Christopher), and Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY (Drakos, O'Malley).

The Journal of the American Academy of Orthopaedic Surgeons
|January 29, 2021
PubMed
Summary
This summary is machine-generated.

Navicular stress fractures in young athletes require prompt diagnosis and treatment. Both surgical and non-surgical methods can yield good results for these complex bone injuries.

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Podiatry

Background:

  • Navicular stress fractures are common in young athletes due to repetitive overload.
  • The navicular bone's unique anatomy and blood supply increase susceptibility to fractures and healing complications.
  • Delayed diagnosis and treatment can lead to poor outcomes, including nonunion.

Purpose of the Study:

  • To review the diagnosis and management of navicular stress fractures in athletes.
  • To highlight the importance of early detection and appropriate treatment strategies.
  • To discuss current nonsurgical and surgical treatment options and patient counseling.

Main Methods:

  • Literature review of navicular stress fractures in athletic populations.
  • Analysis of diagnostic imaging modalities for stress fractures.
  • Evaluation of outcomes for conservative and operative management strategies.

Main Results:

  • Early diagnosis using advanced imaging is crucial for successful treatment.
  • Nonsurgical treatment involves immobilization and non-weight bearing.
  • Surgical intervention, typically open reduction and internal fixation, is an effective option.
  • Both approaches can lead to good patient outcomes when managed appropriately.

Conclusions:

  • Navicular stress fractures are challenging injuries requiring a comprehensive approach.
  • Expeditious diagnosis and tailored treatment are essential for optimal healing.
  • Patient education regarding recovery expectations is vital for managing these complex injuries.