[Hypermobile snapping medial meniscus: features on flexion-extension MRI]

Area of Science:

• Orthopedics
• Radiology
• Anatomy

Background:

• Snapping medial meniscus is a rare condition.
• Hypermobility of the meniscus can lead to symptoms.
• Magnetic Resonance (MR) imaging is crucial for diagnosis.

Observation:

• Three patients presented with snapping medial meniscus.
• MR imaging in extension showed anterior subluxation of the anterior horn of the medial meniscus.
• MR imaging in flexion demonstrated reduction of the subluxation.

Findings:

• The observed snapping medial meniscus was confirmed to be due to hypermobility.
• This hypermobility represents an anatomical variant.
• Dynamic MR imaging is effective in diagnosing this condition.

Implications:

• Understanding this anatomical variant is key for accurate diagnosis.
• Hypermobility of the medial meniscus should be considered in cases of knee pain and snapping.
• Further research into the prevalence and clinical significance of hypermobile medial meniscus is warranted.