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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...

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...

Skin Cancer

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...

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...

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...

Introduction to Joints

Introduction to Joints

The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no movement.

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Related Experiment Video

Updated: May 9, 2026

Preliminary Study on Acupuncture Combined with Grain-sized Moxibustion for Treating Rheumatoid Arthritis with Finger Joint Pain

Preliminary Study on Acupuncture Combined with Grain-sized Moxibustion for Treating Rheumatoid Arthritis with Finger Joint Pain

Published on: May 16, 2025

[Risking the skin for some joints].

T Hermanns-Lé¹, P Delvenne, G E Piérard

¹(1) Maître de Conférence, Consultant Expert clinique, Service de Dermatopathologie, CHU de Liege, BElgique.

Revue Medicale De Liege

|July 30, 2013

Summary

Cannabis use, including marijuana and hemp, can cause adverse skin, eye, and mouth reactions. These effects range from allergic urticaria and Raynaud

Area of Science:

Dermatology
Oral Medicine
Vascular Medicine

Context:

Cannabis, marijuana, and hemp are plant sources rich in cannabinoids like delta-9-tetrahydrocannabinol (THC).
Cannabinoids are known for their psychoactive effects and potential adverse events.
Adverse reactions can manifest on the skin, mucosae, and eyes.

Purpose:

To document and describe the range of adverse events associated with cannabis use.
To highlight specific dermatological, oral, and vascular manifestations.
To inform healthcare professionals about potential cannabis-induced complications.

Summary:

Cannabis use is linked to various adverse events, including skin reactions like contact allergic urticaria.
Oral manifestations include glossitis, atrophic stomatitis, periodontitis, and uvular angioedema.

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In Vivo Imaging Uncovers the Migratory Behavior of Leukocytes within the Joints

In Vivo Imaging Uncovers the Migratory Behavior of Leukocytes within the Joints

Published on: December 9, 2025

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Last Updated: May 9, 2026

Preliminary Study on Acupuncture Combined with Grain-sized Moxibustion for Treating Rheumatoid Arthritis with Finger Joint Pain

Preliminary Study on Acupuncture Combined with Grain-sized Moxibustion for Treating Rheumatoid Arthritis with Finger Joint Pain

Published on: May 16, 2025

In Vivo Imaging Uncovers the Migratory Behavior of Leukocytes within the Joints

In Vivo Imaging Uncovers the Migratory Behavior of Leukocytes within the Joints

Published on: December 9, 2025

Vascular effects may present as Raynaud's phenomenon and arteritis, mimicking Buerger's disease.

Impact:

Increased awareness among clinicians regarding the potential adverse effects of cannabis.
Improved diagnosis and management of patients experiencing symptoms potentially related to cannabis use.
Contribution to the understanding of cannabinoid-induced pathologies.