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Related Concept Videos

Trigonometric Identities II01:28

Trigonometric Identities II

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Double-angle and half-angle trigonometric identities are derived from the fundamental sum and difference formulas and serve as essential tools for simplifying expressions, solving equations, and evaluating integrals. These identities reduce the complexity of trigonometric functions by relating functions of a multiple or fractional angle to functions of a single angle. Their applications extend across mathematics, physics, and engineering, particularly in Fourier analysis, wave mechanics, and...
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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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Related Experiment Video

Updated: Jan 5, 2026

Method and Instrumented Fixture for Femoral Fracture Testing in a Sideways Fall-on-the-Hip Position
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Is a hip flip the right trick?

Leonoor Neline Tess Oerlemans1, Wierd P Zijlstra1, Heleen Lameijer2

  • 1Department of Orthopedic Surgery, Medisch Centrum Leeuwarden, Leeuwarden, The Netherlands.

Emergency Medicine Journal : EMJ
|October 20, 2019
PubMed
Summary

A failed closed reduction of a dislocated total hip arthroplasty (THA) in a 68-year-old man was due to a dislodged liner. Revision surgery is required for this complex hip dislocation case.

Keywords:
dual-mobility cupintra-prosthetic dislocationreductiontotal hip arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering

Background:

  • A 68-year-old male patient with a history of spasticity and a total left hip arthroplasty (THA) presented after a fall.
  • The patient's left leg was noted to be internally rotated and in hyperflexion.

Observation:

  • X-ray confirmed a posterior hip dislocation.
  • A closed reduction attempt using standard manual techniques (flexion, adduction, traction, internal rotation) was unsuccessful.
  • The patient received sedation and analgesia (propofol and esketamine) prior to the attempted reduction.

Findings:

  • The femoral head was not reduced centrally in the acetabulum.
  • The likely cause of failed reduction was a dislodged liner within the dual-mobility cup of the THA.
  • Material failure or improper component seating may have contributed.

Implications:

  • Closed reduction is not always effective in cases of total hip arthroplasty dislocation, especially with component issues.
  • Revision surgery is necessary when closed reduction fails and there is evidence of component malpositioning or failure.
  • This case highlights the importance of imaging and intraoperative assessment in managing complex THA dislocations.