Origins and insertions of the triangular fibrocartilage complex: a histological study

Area of Science:

• Orthopedics
• Anatomy
• Histology

Background:

• The triangular fibrocartilage complex (TFCC) is vital for wrist stability and function.
• Detailed histological understanding of TFCC origins and insertions is limited.

Purpose of the Study:

• To histologically examine the origins and insertions of the TFCC in fresh-frozen cadaver wrists.
• To elucidate the anatomical attachments of the TFCC for improved understanding of wrist biomechanics.

Main Methods:

• Serial histological sectioning of fresh-frozen cadaver wrists.
• Microscopic examination of TFCC origins and insertions.

Main Results:

• The radioulnar ligament originates from the ulnar fovea and ulnar styloid base.
• The extensor carpi ulnaris sheath attaches to the ulnar fovea.
• Ulnocarpal fibers originate from the ulnar styloid and insert onto the triquetrum.
• Ulnolunate and ulnotriquetral ligaments arise from the palmar TFCC.
• TFCC insertion into the radial sigmoid notch shows central fibrocartilage and peripheral fibro-osseous transitions.

Conclusions:

• Detailed histological analysis clarifies TFCC attachments to the ulna and radius.
• Understanding these precise origins and insertions is key for diagnosing and treating TFCC injuries.
• This study provides a foundational histological map of the TFCC for anatomical and clinical reference.