Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Wedges01:24

Wedges

A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...
Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Unusual Results01:16

Unusual Results

Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ  from the mean, μ  is considered unusual.
Maximum unusual value = μ + 2σ
Minimum unusual value...
Tetanus01:29

Tetanus

Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...
Local Anesthetics: Mechanism of Action01:23

Local Anesthetics: Mechanism of Action

Local anesthetics (LAs) block sensory and motor impulses by inhibiting the sodium channels on the nerve cell membranes. This induces temporary loss of sensation, relieving pain in a specific body area.
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Using content analysis of video-recorded consultations to identify smokers' "readiness" and "resistance" towards stopping smoking.

Patient education and counseling·2000
Same author

Analysis of the effects of treatment of human Schistosoma mansoni infection on the immune response of patients from endemic areas.

Acta tropica·2000
Same author

A comparison of individual and population smoking data from a postal survey and general practice records.

The British journal of general practice : the journal of the Royal College of General Practitioners·2000
Same author

Frequent loss of BRCA1 mRNA and protein expression in sporadic ovarian cancers.

International journal of cancer·2000
Same author

Detection of the exotic mosquito Culex gelidus in the Northern Territory.

Communicable diseases intelligence·2000
Same author

Evaluation of treatment response in patients with seasonal allergic rhinitis using domiciliary nasal peak inspiratory flow.

Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology·2000

Related Experiment Video

Updated: Jul 20, 2026

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
04:41

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Published on: June 6, 2025

An unusual cause of locking.

R Jandhyala1, A Wilson, S Bhagat

  • 1Department of Plastic Surgery, St Thomas' Hospital, Lambeth Palace Road, London, SE1 7EH, UK.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|September 6, 2006
PubMed
Summary

A plastic foreign body in a knee joint was discovered 21 years after injury, despite normal initial and follow-up imaging. Arthroscopy confirmed and removed the plastic, resolving the patient's locking symptoms.

More Related Videos

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice
07:41

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice

Published on: November 13, 2016

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats
05:34

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats

Published on: May 20, 2019

Related Experiment Videos

Last Updated: Jul 20, 2026

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
04:41

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Published on: June 6, 2025

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice
07:41

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice

Published on: November 13, 2016

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats
05:34

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats

Published on: May 20, 2019

Area of Science:

  • Orthopaedic Surgery
  • Radiology
  • Medical Imaging

Background:

  • A case report detailing a delayed diagnosis of a foreign body in the knee joint.
  • Highlights the challenges in identifying intra-articular plastic fragments.
  • Emphasizes the long-term consequences of undetected foreign bodies.

Observation:

  • A patient presented with persistent knee locking symptoms 21 years post-injury.
  • Initial and serial radiological investigations, including X-rays and MRI, were unremarkable.
  • Clinical suspicion led to arthroscopic examination.

Findings:

  • Arthroscopy revealed a retained plastic foreign body within the knee joint.
  • Successful surgical removal of the plastic fragment was achieved.
  • Post-operative resolution of intermittent knee locking symptoms.

Implications:

  • Underscores the critical role of clinical suspicion in diagnosing persistent joint symptoms, even with normal imaging.
  • Suggests that certain plastic foreign bodies may not be readily detected by standard radiological modalities.
  • Highlights the effectiveness of arthroscopy in diagnosing and treating intra-articular foreign bodies missed by initial investigations.