The pisohamate ligament connects the pisiform to the hook of the hamate, transmitting FCU force distally to the hamate and through the pisometacarpal ligament to the fifth metacarpal. Together with the pisometacarpal ligament it forms the functional continuation of the FCU tendon past the pisiform sesamoid. The pisohamate ligament forms the medial wall of Guyon's canal at the wrist.
| Origin | Pisiform |
|---|---|
| Insertion | Hook of the hamate |
| Actions | Transmits FCU force from the pisiform sesamoid to the hamate; forms part of the Guyon canal medial wall |
|---|
Pisohamate ligament laxity from pisotriquetral arthritis or pisiform fractures can destabilise the medial Guyon canal wall, contributing to ulnar nerve compression. Pisiform excision preserves the pisohamate and pisometacarpal ligament remnants, maintaining the FCU-to-hamate force transmission.
Pisohamate ligament laxity from pisiform pathology destabilising the medial Guyon canal wall and contributing to ulnar nerve compression.
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