Related Experiment Video
Updated: Jun 2, 2026

Murine Hind Limb Explant Model for Studying the Mechanobiology of Achilles Tendon Impingement
Published on: December 8, 2023
Intraarticular fibroma of tendon sheath
Michael J Griesser1, Paul E Wakely, Joel Mayerson
1Department of Orthopaedics, The Ohio State University, Columbus, OH, USA.
Abstract:
A 17-year-old male presented to us following a hyperflexion injury to his right knee sustained while playing soccer. Immediately after the traumatic event, he developed a large, tense knee effusion. Physical examination revealed limited range of motion. MRI revealed a lobulated mass in the posteromedial aspect of the knee joint. The mass was excised and sections submitted to pathology. A pathologic, microscopic, and immunohistochemical characteristics revealed the final diagnosis of fibroma of tendon sheath in the knee. At 12 months followup, the patient reported no subjective symptoms, such as pain or limitation of athletic activities and has full range of motion. Additionally, he has demonstrated no signs of recurrence. We report a case of fibroma of the tendon sheath originating from the synovial membrane of the joint capsule of the knee.
Related Concept Videos
Structural Joints: Fibrous Joints
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
Layers of Connective Tissue Proper
Structural Classification of Joints
A fibrous joint is where the adjacent bones are united by fibrous connective...
Structural Joints: Synovial Joints
Knee Joint
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...
Fibril-associated Collagen
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...