VIDEO
CONTENT
QUIZ
MATERIALS
Quick Facts
Key Features
Surface Anatomy
Landmark
Surfaces
Ossification
Variations
Clinical Correlates
Quick Facts about the Pisiform Bone
- Location: Hand
- Bone Type: Sesamoid bone
- Key Features: Palmar and dorsal surfaces; triquetrum articular facet
- Articulates With: Triquetrum bone
- Arterial Supply: Ulnar artery
Key Features & Anatomical Relations of the Pisiform
- Shape: Pea-shaped
- Position in the Hand: Proximal row of carpal bones
- Surfaces: Includes palmar (Facies palmaris ossis pisiformis) and dorsal (Facies dorsalis ossis pisiformis) surfaces
- Landmark: Articular facet for articulation with the triquetrum (Facies articularis triquetra ossis pisiformis)
Location and Articulation
- Proximity: Above the hamate bone, below the ulna, in front of the triquetrum
- Joint: Forms the pisotriquetral joint with the triquetrum bone
Surface Anatomy of the Pisiform
- Palpation: The pisiform is palpable proximal to the hypothenar eminence, on the medial side of the palm
Landmark of the Pisiform Bone
- Triquetrum Articular Facet (Facies articularis triquetra ossis pisiformis): This is a small, flat, oval area on the dorsal aspect of the pisiform bone. It creates a joint surface for articulation with the triquetrum, forming the pisotriquetral joint.
Each of these features serves a purpose in hand anatomy and function:
- The palmar surface of the pisiform provides attachment for ligaments and a part of the tendon of the flexor carpi ulnaris muscle.
- The dorsal surface is less clinically significant but serves as a point of attachment for ligaments that connect the pisiform to other carpal bones.
- The triquetrum articular facet is crucial for the mobility and stability of the wrist as it is the interface for the pisiform-triquetrum articulation.
Surfaces of the Pisiform Bone
- Palmar Surface (Facies palmaris ossis pisiformis): This is the front surface of the pisiform bone. It faces towards the palm of the hand.
- Dorsal Surface (Facies dorsalis ossis pisiformis): This is the rear surface of the pisiform bone. It is oriented towards the back of the hand.
Ossification of the Pisiform
- Ossification Centers: One, appearing between the ninth to twelfth years of life
- Ossification Completion: During middle to late adolescence
Variations in Pisiform Anatomy
- Bipartite Condition: Sometimes the pisiform can be split into two parts
Clinical Correlates
- Fracture: The pisiform bone can be fractured, although this is relatively rare
