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Related Concept Videos

Net Torque Calculations01:19

Net Torque Calculations

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Muscles that Move the Forearm01:16

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The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
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Muscles of the Forearm that Move the Hand and Fingers01:17

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The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
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Moment of a Force: Problem Solving01:29

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Understanding the scalar formulation of the moment of a force and applying it correctly through problem-solving is crucial in designing and analyzing mechanical systems. Here are the steps for problem-solving with the moment of a force:
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Machines01:19

Machines

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
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Torque01:10

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Articles linked to this work by shared authors, journal, and citation graph.

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Same author

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Related Experiment Video

Updated: Aug 15, 2025

Visualizing Motion Patterns in Acupuncture Manipulation
08:18

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"Power knuckle" for facilitating the "move the cap" technique.

Minh N Vo1, Emmanouil S Brilakis2, William Lombardi3

  • 1Royal Columbian Hospital, Vancouver, British Columbia, Canada.

Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions
|January 8, 2023
PubMed
Summary

The power knuckle technique safely enters the subintimal space for chronic total occlusion recanalization. This method improves success rates for challenging cases with ambiguous proximal caps.

Keywords:
chronic total occlusionpercutaneous coronary intervention

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Last Updated: Aug 15, 2025

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Area of Science:

  • Cardiovascular Interventions
  • Interventional Cardiology
  • Vascular Biology

Background:

  • Chronic total occlusions (CTO) present significant challenges in recanalization.
  • Proximal cap ambiguity in CTOs is associated with higher procedural failure rates.

Observation:

  • A novel "power knuckle" technique is described for CTO recanalization.
  • This technique involves safe entry into the subintimal space proximal to the ambiguous cap using a knuckle wire, microcatheter, and inflated balloon.

Findings:

  • The power knuckle technique facilitates entry into the extraplaque space.
  • This enables subsequent antegrade dissection and re-entry strategies.

Implications:

  • The power knuckle technique offers a potential solution for complex CTO cases.
  • Improved recanalization strategies may enhance outcomes for patients with CTOs.