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Updated: Sep 13, 2025
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Intrasheath Tendon Subluxation Beyond the Ankle: The First Case Series in the Hand.
Hannah Lamberg1, Molly N Pantelic1, Erika Mojica1
1Division of Musculoskeletal Radiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan, USA.
Summary
Intrasheath tendon subluxation, previously known in the ankle, is now described in the hand. This case series highlights its unique sonographic findings and diagnostic importance.
Area of Science:
- Musculoskeletal imaging
- Hand and wrist anatomy
- Diagnostic ultrasound
Background:
- Intrasheath tendon subluxation is a recognized condition affecting the peroneal tendons at the ankle.
- This phenomenon has not been previously documented or described in the tendons of the hand.
Observation:
- This study presents the first three cases of intrasheath tendon subluxation occurring within the hand.
- Dynamic sonography was utilized to visualize the subluxation of both flexor and extensor tendons.
Findings:
- The study details the anatomical structures of the hand tendons involved.
- Key dynamic sonographic features characteristic of intrasheath tendon subluxation in the hand are presented.
- Potential mechanisms leading to this rare condition are discussed.
Implications:
- Intrasheath tendon subluxation in the hand is an uncommon and often overlooked diagnosis.
- Awareness of this entity and its sonographic appearance is critical for accurate clinical diagnosis.
- Dynamic ultrasound is essential for identifying this condition, which may otherwise be missed.
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