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Related Concept Videos

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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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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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Knee Joint01:23

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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
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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.
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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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The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...
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Related Experiment Video

Updated: Jul 29, 2025

A Mouse Model of Ankle-Subtalar Complex Joint Instability
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Lunotriquetral Coalition.

Kris Mertens1,2, Marc Mespreuve2,3, Filip M Vanhoenacker1,2,3,4

  • 1Department of Radiology, UZ Leuven, University of Leuven, Leuven, Belgium.

Seminars in Musculoskeletal Radiology
|May 25, 2023
PubMed
Summary
This summary is machine-generated.

Bilateral asymptomatic lunotriquetral (LT) coalition, the most common carpal coalition, was incidentally found on wrist X-rays. Conventional radiography is key for detecting and classifying LT coalition, with MRI useful for symptomatic cases.

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Area of Science:

  • Orthopedics
  • Radiology
  • Anatomy

Background:

  • Lunotriquetral (LT) coalition is the most frequent type of carpal coalition.
  • Four distinct morphological classifications of LT coalition exist.
  • While typically asymptomatic, certain fibrocartilaginous coalitions can manifest as ulnar wrist pain.

Observation:

  • This report details a case of bilateral asymptomatic LT coalition.
  • The condition was an incidental finding on conventional radiography following a wrist injury.
  • Conventional radiography serves as the primary imaging modality for LT coalition detection and classification.

Findings:

  • The case highlights the incidental discovery of bilateral asymptomatic lunotriquetral coalition.
  • Conventional radiography effectively identified and classified the coalition.
  • Magnetic resonance imaging (MRI) is valuable for assessing associated carpal pathologies, especially in symptomatic patients.

Implications:

  • This finding underscores the utility of conventional radiography in diagnosing lunotriquetral coalition.
  • MRI can be crucial for surgical planning in symptomatic cases of carpal coalition.
  • Understanding the varied presentations of LT coalition is important for accurate diagnosis and management.