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Related Concept Videos

Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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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

Knee Joint

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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.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Tumor Immunotherapy01:27

Tumor Immunotherapy

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Functional Classification of Joints01:09

Functional Classification of Joints

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Functional Classification of Joints
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.
Synarthrosis
An...
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Structural Classification of Joints01:20

Structural Classification of Joints

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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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Tumor Progression02:07

Tumor Progression

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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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Related Experiment Video

Updated: Sep 13, 2025

Author Spotlight: Double Posteromedial Approach for Treating Posterior Cruciate Ligament Cysts
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Author Spotlight: Double Posteromedial Approach for Treating Posterior Cruciate Ligament Cysts

Published on: October 20, 2023

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Intraarticular Tumors.

Michael E Kallen1, John M Gross2

  • 1Department of Pathology, University of Maryland School of Medicine, 22 South Greene Street, NBW-54, Baltimore, MD 21201, USA.

Surgical Pathology Clinics
|July 27, 2025
PubMed
Summary
This summary is machine-generated.

Intraarticular tumors, rare joint neoplasms, present diagnostic challenges. This review highlights common benign tumors and their mimics to aid pathologists.

Keywords:
Calcified chondroid mesenchymal neoplasmClear cell sarcomaFibroma of tendon sheathIntraarticular neoplasiaJoint tumorSynovial chondromatosisSynovial sarcomaTenosynovial giant cell tumor

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Area of Science:

  • Orthopedic Pathology
  • Oncology
  • Radiology

Background:

  • Intraarticular tumors are uncommon but pose significant diagnostic challenges.
  • Misdiagnosis can lead to severe clinical consequences.
  • Most joint-based tumors are benign and limited in number.

Purpose of the Study:

  • To illustrate key features of common intraarticular tumors.
  • To provide updates on intraarticular neoplasia.
  • To assist pathologists in recognizing these tumors and their mimics.

Main Methods:

  • Review of common intraarticular tumors.
  • Discussion of diagnostic pearls for pathologists.
  • Analysis of tumor mimics.

Main Results:

  • Common intraarticular tumors are predominantly benign.
  • Specific features aid in differentiating tumors from mimics.
  • Updates in neoplasia management are provided.

Conclusions:

  • Accurate recognition of intraarticular tumors is crucial.
  • Understanding tumor features and mimics improves diagnostic accuracy.
  • This review offers practical guidance for pathologists.