Plicae: Where Do They Come from and When Are They Relevant?

Area of Science:

• Orthopedics
• Developmental Biology
• Radiology

Background:

• Synovial plicae are vestigial synovial folds found in joints like the knee, elbow, and hip.
• They originate from embryonic membranes dividing synovial cavities during joint development.
• Normally asymptomatic, plicae can become symptomatic if inflamed or thickened.

Purpose of the Study:

• To provide a comprehensive overview of synovial plicae.
• To discuss their embryological origin, anatomy, and associated pathologies.
• To describe their appearance on medical imaging and explore less common locations.

Main Methods:

• Literature review and synthesis of existing research on synovial plicae.
• Analysis of embryological development related to synovial joint formation.
• Review of imaging modalities used to visualize synovial plicae and their pathologies.

Main Results:

• Synovial plicae are embryonic remnants that can cause mechanical symptoms and chondral damage when pathologically altered.
• Inflammation, thickening, and fibrosis are common pathological changes.
• Imaging techniques reveal characteristic appearances of plicae in various joints.

Conclusions:

• Understanding the embryology and pathology of synovial plicae is crucial for diagnosis and management.
• This review consolidates knowledge on plicae, including less common sites.
• Further research may elucidate optimal treatment strategies for symptomatic plicae.