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Related Concept Videos

Functional Classification of Joints01:09

Functional Classification of Joints

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
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Structural Classification of Joints01:20

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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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Multi-input and Multi-variable systems01:22

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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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Related Experiment Video

Updated: Mar 13, 2026

The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report
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A mixed reality framework for interpretable and explainable joint replacement assessment.

Luca Ulrich1, Chiara Innocente1, Giorgia Marullo1

  • 1Department of Management and Production Engineering, Politecnico Di Torino, C.so Duca Degli Abruzzi, 24, Torino, 10129, Italy.

International Journal of Medical Informatics
|March 11, 2026
PubMed
Summary
This summary is machine-generated.

A new Mixed Reality (MR) framework offers accurate, quantitative assessment of joint replacement outcomes. This patient-specific tool enhances postoperative care and decision-making for total hip arthroplasty (THA) patients.

Keywords:
Computer-aided surgeryHuman-computer interactionJoint replacementMixed realityOrthopedic surgeryTotal Hip arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Arthroplasty is common but has variable outcomes and complications.
  • Assessing joint mobility post-surgery is challenging due to limited quantitative tools.
  • Current methods lack standardization, impacting reliable postoperative evaluation.

Purpose of the Study:

  • To introduce a patient-specific Mixed Reality (MR) framework for enhanced postoperative evaluation of joint replacements.
  • To focus on improving the assessment of total hip arthroplasty (THA) outcomes.
  • To enable objective quantification and visualization of prosthesis biomechanics.

Main Methods:

  • Integrated ROM simulation and 3D modeling for objective quantification.
  • Retrospective analysis of 67 THAs comparing simulated ROM with clinical data and literature.
  • Surgeon evaluation of clinical relevance and usability using the System Usability Scale (SUS).

Main Results:

  • Simulated ROM measurements aligned well with clinical assessments and literature benchmarks.
  • The MR tool demonstrated high accuracy, repeatability, and potential for decision support.
  • Usability testing yielded a high median SUS score of 82.5, indicating strong clinician acceptance.

Conclusions:

  • The patient-specific MR framework offers a reliable, quantitative, and interpretable method for assessing prosthetic joint performance.
  • This tool can be integrated into postoperative workflows for improved surgical outcome assessment.
  • The MR framework supports enhanced decision-making in the management of joint replacement patients.