Incurvated nail. Does the phalanx determine nail plate shape?

Area of Science:

• Anatomy
• Biomechanics
• Orthopedics

Background:

• The morphology of the hallux (big toe) nail plate and its underlying distal phalanx base is crucial for understanding foot biomechanics and potential deformities.
• Previous research has explored various aspects of foot anatomy, but the precise correlation between nail plate shape and phalangeal base structure requires further investigation.

Purpose of the Study:

• To anatomically examine the relationship between the hallux nail plate's shape and the distal phalanx base.
• To quantify specific morphological variables of both the nail plate and the bone.

Main Methods:

• Anatomical examination of nine variables in 23 cadaver hallux specimens.
• Measurements included distal phalanx base dimensions, proximal nail plate dimensions, nail plate distal shape, and structural indices.
• Statistical analysis using correlation coefficients to compare nail and bone structural indices.

Main Results:

• A high and statistically significant correlation was found between the structural index of the nail plate and the structural index of the distal phalanx base.
• Specific variables related to the proximal aspect of the nail plate showed a strong correlation with the phalangeal base shape.

Conclusions:

• The shape of the hallux nail plate, particularly its proximal aspect, is significantly correlated with the shape of the distal phalangeal base.
• This finding highlights a direct anatomical link that may have implications for understanding conditions affecting the hallux.