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Updated: Jun 16, 2025

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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动态对齐的边界:为什么,什么时候,如何

Pier Francesco Indelli1,2,3,4, Giuseppe Petralia5, Stefano Ghirardelli1,2

  • 1Department of Orthopaedic Surgery, Südtiroler Sanitätsbetrieb, Brixen, Italy.

The journal of knee surgery
|August 20, 2024
PubMed
概括

在全膝关节整形术 (TKA) 中的动力调整旨在通过复制自然膝关节解剖来提高患者的满意度. 本综述探讨了TKA的安全对齐边界,平衡患者解剖学与植入物存活率.

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Kinematic Equations for Rotation01:30

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
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The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
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The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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