WRIST LIGAMENTS ANATOMY AND FUNCTION

Wrist ligament nomenclature has evolved with increased anatomic and functional knowledge Early anatomincal classification have given way to a more functional assessment List of wrist ligaments grouped by location: • Extracapsular

Flexor retinaculum Pisi-Hamate ligament Pisi- Metacarpal ligament • Intracapsular

Radial collateral ligament Ulnar collateral ligament Dorsal radiotriquetral ligament Dorsal ulnotriquetral ligament

Radioscaphocapitate ligament Radiolunotriquetral ligament Radioscapholunate ligament Short radiolunate ligament

Ulnolunate ligament Palmar ulnotriquetral ligament • Intraarticular Scapholunate ligament (dorsal segment)

Lunotriquetral ligament (dorsal segment) Dorsal scaphotriquetral ligament Dorsal scaphotrapeziotrapezoid ligament Scapholunate ligament (palmar segment)

Lunotriquetral ligament (palmar segment) Palmar scaphotriquetral ligament Radial bundle collateral ligament Ulnar bundle of the collateral ligament

Palmar scaphotrapeziotrapezoid ligament Interosseous ligament joining trapezium, trapezoid, capitate, and hamate

WRIST LIGAMENT ALTERNATIVE GROUPING

eg Scapholunate • ORIENTATION transverse, longitudinal, oblique • STABILISING FUNCTION

antopronation, antisupination The helical antipronation group are those that keep the wrist stable during axial compression or pronation The scaphoid rotates forward - constrained by the radio- scapho-capitate lig The triqyetral extends - constrained by the ulnotriquetral and ulnolunate ligs

The dorsal scapholunate and radio-scapho-triquetral ligs The helical antisupination group protect against traction and over supination Ther are two groups, medial and lateral The medial are

The lateral are a line of ligaments extending from the ulna to the tripezium on the volar surface The medial group protect the ulnar corner and are the dorsal radio-scapho-lunate and the Palmar triquetro-hamate-capitate