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Ankle Joint

Ankle Joint

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...

Development of the Limb Synovial Joints

Development of the Limb Synovial Joints

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.
During development, the limbs...

Knee Joint

Knee Joint

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.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

Structural Joints: Cartilaginous Joints

Structural Joints: Cartilaginous Joints

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.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary or...

Structural Joints: Synovial Joints

Structural Joints: Synovial Joints

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...

Joints

Joints

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.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...

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Related Experiment Video

Updated: Jun 11, 2026

Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale

Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale

Published on: August 25, 2014

[A neonate with increased joint laxity].

Welmoed Schakel¹, Frans J Walther

¹Leids Universitair Medisch Centrum, afd. Neonatologie, Leiden, the Netherlands. w_schakel@hotmail.com

Nederlands Tijdschrift Voor Geneeskunde

|July 13, 2010

Summary

This summary is machine-generated.

A neonate was diagnosed with arthrochalasia type Ehlers-Danlos syndrome, a rare genetic connective tissue disorder. This condition is characterized by joint hypermobility and skin hyperextensibility.

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Area of Science:

Medical Genetics
Pediatrics
Dermatology

Background:

Ehlers-Danlos syndrome (EDS) comprises a group of inherited connective tissue disorders.
Arthrochalasia EDS (aEDS) is a rare subtype characterized by severe joint hypermobility and congenital hip dislocations.

Observation:

A neonate presented with significant joint laxity and dislocations affecting multiple joints.
The infant also exhibited generalized skin hyperextensibility and unique palmar creases described as criss-cross lines.

Findings:

The clinical presentation was consistent with arthrochalasia type Ehlers-Danlos syndrome.
Diagnostic criteria for aEDS were met based on the observed physical manifestations.

Implications:

Early diagnosis of aEDS is crucial for appropriate management and genetic counseling.
Understanding the specific subtype of EDS aids in predicting disease progression and potential complications.