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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...

The Proteasome

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...

The Proteasome

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...

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...

Structural Classification of Joints

Structural Classification of Joints

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.
A fibrous joint is where the adjacent bones are united by fibrous connective...

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Related Experiment Video

Updated: Jun 19, 2026

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint

Published on: July 22, 2021

THE MANNER OF REMOVAL OF PROTEINS FROM NORMAL JOINTS.

W Bauer¹, C L Short, G A Bennett

¹Medical Clinic of the Massachusetts General Hospital and the Department of Pathology, Harvard Medical School, Boston.

The Journal of Experimental Medicine

|October 30, 2009

Summary

The lymphatic system is crucial for removing proteins from joints. This study demonstrates how protein size affects lymphatic removal, suggesting a new clinical test for joint lymphatic function.

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Flow Cytometry Analysis of Immune Cell Subsets within the Murine Spleen, Bone Marrow, Lymph Nodes and Synovial Tissue in an Osteoarthritis Model

Flow Cytometry Analysis of Immune Cell Subsets within the Murine Spleen, Bone Marrow, Lymph Nodes and Synovial Tissue in an Osteoarthritis Model

Published on: April 24, 2020

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Last Updated: Jun 19, 2026

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint

Published on: July 22, 2021

Flow Cytometry Analysis of Immune Cell Subsets within the Murine Spleen, Bone Marrow, Lymph Nodes and Synovial Tissue in an Osteoarthritis Model

Flow Cytometry Analysis of Immune Cell Subsets within the Murine Spleen, Bone Marrow, Lymph Nodes and Synovial Tissue in an Osteoarthritis Model

Published on: April 24, 2020

Area of Science:

Immunology
Physiology
Biochemistry

Background:

The lymphatic system plays a vital role in fluid and protein homeostasis.
Understanding protein transport from synovial joints is essential for diagnosing joint effusions.

Purpose of the Study:

To investigate the lymphatic removal of proteins from canine knee joints.
To determine the influence of protein molecular size and joint activity on lymphatic drainage.
To explore the potential for a clinical test assessing joint lymphatic function.

Main Methods:

Precipitin tests were employed to detect egg white and horse serum proteins injected into dog knee joints.
Lymphatic transport was assessed by analyzing protein presence in blood and thoracic duct lymph.
Joint exercise (passive and active via massage) was used to evaluate its effect on protein removal.

Main Results:

Egg white proteins are exclusively removed via lymphatics, with faster clearance observed after leg massage or passive joint exercise.
Horse serum albumin is efficiently cleared through lymphatics, accelerated by joint exercise.
Horse serum globulin removal is significantly hindered, suggesting a molecular size limitation for lymphatic uptake from joints.

Conclusions:

Lymphatic drainage is the primary mechanism for protein removal from synovial joints.
Protein molecular size dictates its ability to enter lymphatic capillaries from the joint.
Impaired lymphatic drainage may lead to intra-articular effusion, highlighting the potential for a clinical diagnostic test.