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Development of the Limb Synovial Joints01:07

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Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Structural Joints: Fibrous Joints01:03

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Joints01:26

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Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
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In vitro dissolution and drug release tests assess how quickly and how much of a drug is released from its dosage form into an aqueous medium under standardized laboratory conditions. These tests are essential tools in pharmaceutical development and quality assurance, offering insight into the drug's performance before clinical use.During formulation development, dissolution testing identifies incomplete or inconsistent drug release issues. It also supports decisions on selecting the optimal...
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Robotic hip joint testing: Development and experimental protocols.

Hadi El Daou1, K C Geoffrey Ng1, Richard Van Arkel1

  • 1Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK.

Medical Engineering & Physics
|November 14, 2018
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Summary

This study introduces a novel robotic platform for precise hip joint biomechanical testing. The system offers enhanced control and accuracy compared to conventional methods, improving in vitro joint analysis.

Keywords:
BiomechanicsHipIn vitroOptical trackingRobotics

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Area of Science:

  • Biomechanics
  • Robotics
  • Orthopedics

Background:

  • In vitro biomechanical joint testing is crucial for understanding joint mechanics.
  • Robotic systems offer precise control over multiple degrees of freedom, surpassing conventional methods.
  • Force sensing combined with robotics is becoming the standard for joint testing.

Purpose of the Study:

  • To describe a novel robotic platform for hip joint biomechanical testing.
  • To present an experimental protocol for hip joint laxity testing using the robotic platform.
  • To compare the robotic system's performance against a conventional mechanical testing rig.

Main Methods:

  • Developed a novel robotic platform with six degrees of freedom control.
  • Implemented optical tracking and registration to define the hip joint's center of rotation (COR).
  • Utilized a hybrid force/position control law and the International Society of Biomechanics (ISB) anatomical coordinate system for testing on cadaveric hip joints.

Main Results:

  • Simulated internal-external and adduction/abduction laxity tests were performed on two cadaveric hip joints.
  • Peak range of motion (ROM) was measured and compared between the robotic system and a mechanical testing rig.
  • Similarities and differences were observed, highlighting robotic system advantages.

Conclusions:

  • The novel robotic platform provides precise control for in vitro hip joint testing.
  • Robotic systems offer advantages over conventional methods in terms of accuracy and control.
  • This technology enhances the value of in vitro biomechanical testing for joint analysis.