The subtalar joint: embryology and morphology.

Area of Science:

• Anatomy
• Embryology
• Histology

Background:

• The subtalar joint is a recently evolved anatomical structure.
• The anterior subtalar joint exhibits variable morphology, classified into ovoid, bean, and two-part descriptions.
• Existing literature presents confusion regarding subtalar joint ligamentous anatomy.

Purpose of the Study:

• To provide a clear and comprehensive description of subtalar joint ligament anatomy.
• To elucidate the form and function of key ligaments: retinacula, cervical ligament, and ligament of the canal.
• To investigate the microscopic anatomy of these ligaments, focusing on innervation and fiber structure.

Main Methods:

• Embryological analysis to understand the joint's evolutionary status.
• Morphological examination of the anterior subtalar joint.
• Detailed anatomical dissection and description of ligaments.
• Histological examination of ligamentous tissue, including innervation and fiber analysis.

Main Results:

• The subtalar joint is identified as a recently acquired structure based on embryological data.
• Three distinct anatomical morphologies (ovoid, bean, two-part) are confirmed for the anterior subtalar joint.
• Detailed descriptions of the retinacula, cervical ligament, and ligament of the canal are provided.
• Microscopic analysis reveals specific innervation patterns and fiber arrangements within the studied ligaments.

Conclusions:

• A clearer understanding of subtalar joint anatomy, particularly its ligaments, is established.
• The study addresses and aims to resolve existing confusion in the literature regarding subtalar joint morphology and ligamentous structures.
• This detailed anatomical description provides a foundation for further research and clinical understanding of the subtalar joint.