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Related Concept Videos

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

589
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
589
Residual Stresses in Bending01:18

Residual Stresses in Bending

642
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Circular Shafts - Elastoplastic Materials01:24

Circular Shafts - Elastoplastic Materials

556
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
556
Transformation of Plane Stress01:18

Transformation of Plane Stress

818
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
818

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Post-traumatic elbow rotational stiffness.

Samuel Kk Ling1, Tun Hing Lui1, Yan Sui Faan2

  • 1Department of Orthopaedics and Traumatology North District Hospital, Sheung Shui, New Territories, Hong Kong.

Shoulder & Elbow
|September 2, 2016
PubMed
Summary
This summary is machine-generated.

Surgical release effectively improves elbow range of motion in both sagittal and rotational planes, significantly enhancing upper limb function for patients with post-traumatic elbow stiffness.

Keywords:
Elbow jointelbow rotational motionelbow sagittal motionpost-traumatic elbow stiffnesspronationsupination

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Area of Science:

  • Orthopedic Surgery
  • Biomechanics
  • Rehabilitation Medicine

Background:

  • Elbow joint is crucial for daily function, enabling sagittal (flexion/extension) and rotational (pronation/supination) movements.
  • Post-traumatic elbow stiffness severely impairs function, with limited established guidelines for management.
  • Existing literature often overlooks rotational motion in treating elbow stiffness.

Purpose of the Study:

  • To evaluate surgical release outcomes for post-traumatic elbow stiffness.
  • To assess the impact of both sagittal and rotational motion on upper limb function.
  • To determine optimal management strategies for elbow stiffness.

Main Methods:

  • Retrospective case series of patients undergoing surgical release for elbow stiffness over 36 months.
  • Serial measurement of range of motion (sagittal and rotational).
  • Analysis of Disabilities of the Arm, Shoulder and Hand (DASH) scores.

Main Results:

  • Both sagittal and rotational elbow motion independently influence upper limb function.
  • Surgical approaches, including arthroscopic-assisted procedures, significantly increase both motion planes.
  • Improved range of motion correlated with statistically significant functional gains.

Conclusions:

  • Effective management of post-traumatic elbow stiffness requires addressing both sagittal and rotational motion planes.
  • Various surgical techniques are effective in restoring elbow mobility.
  • Restoring comprehensive elbow motion is key to improving patient function.