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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.
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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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Carpal Ligaments: A Functional Classification.

Marc Garcia-Elias1, Inma Puig de la Bellacasa2, Corinne Schouten3

  • 1Hand & Upper Limb Surgery, Institut Kaplan, Passeig de la Bonanova, 9, 2on 2a, Barcelona 08022, Spain; Department of Anatomy, Facultat de Medicina, Universitat de Barcelona, Carrer de Villarroel 170, Barcelona 08036, Spain.

Hand Clinics
|July 5, 2017
PubMed
Summary

Carpal ligaments behave differently based on applied wrist forces. Helical antipronation ligaments activate with axial loading, while antisupination ligaments manage distal row supination torques, aiding instability treatment.

Keywords:
AnatomyAxial loadingCarpal ligamentsKineticsWrist

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Area of Science:

  • Biomechanics
  • Orthopedic research
  • Human anatomy

Background:

  • Carpal ligament function is crucial for wrist stability.
  • Previous understanding of carpal ligament mechanics was limited.
  • Wrist injuries often involve carpal ligament damage.

Purpose of the Study:

  • To investigate the kinetic behaviors of carpal ligaments under varying force applications.
  • To differentiate the functional roles of helical antipronation and antisupination ligaments.
  • To provide a novel interpretation of carpal ligament function for clinical applications.

Main Methods:

  • Laboratory research involving controlled force application to the wrist.
  • Analysis of carpal ligament kinetic responses to different loading conditions.
  • Identification of specific ligament activation patterns based on force direction and application point.

Main Results:

  • Carpal ligaments demonstrate distinct kinetic behaviors influenced by force direction and application point.
  • Helical antipronation ligaments are primarily active during axial wrist loading.
  • Helical antisupination ligaments specifically constrain supination torques acting on the distal carpal row.

Conclusions:

  • A novel understanding of carpal ligament function based on directional kinetics has been established.
  • This research offers insights into the specific roles of different carpal ligament groups.
  • Findings may inform the development of improved treatment strategies for carpal instabilities.