The morphologic and morphometric features of the pisiform: a radioanatomic study

Area of Science:

• Anatomy
• Radiology
• Orthopedics

Background:

• The pisiform bone is a small, pea-shaped bone located in the proximal row of the wrist.
• Understanding its morphologic and morphometric features is crucial for accurate diagnosis and treatment of wrist pathologies.

Purpose of the Study:

• To investigate the morphologic and morphometric characteristics of the pisiform bone.
• To analyze the pisiform's topographic relationship with adjacent bony structures.
• To establish normative data for clinical and surgical applications.

Main Methods:

• Retrospective analysis of 208 unilateral hand and wrist CT scans (62 female, 146 male).
• Eight distinct measurements performed using 3D Slicer software.
• Novel classification of the pisiform's triquetral facet shape.

Main Results:

• Significant differences in truncated hand length (THL), longitudinal diameter of pisiform (LDP), transverse diameter of pisiform (TDP), and piso-triquetral distance (PTD) were observed between genders (higher in males).
• No significant differences in measurements were found between right and left hands.
• PTD values varied significantly across different age groups.
• The most prevalent pisiform triquetral facet shape was elliptical (85.6%).

Conclusions:

• This study provides comprehensive morphologic and morphometric data for the pisiform bone.
• Findings enhance the understanding of wrist anatomy, aiding surgical interventions.
• Normative data established can assist in diagnosing and managing pisiform-related conditions.