The trapezoid (in new nemenclature: trapezum ) is a Os second line of the carpus whose functional role (in duet with the Os scaphoïde) is fundamental in biomechanics of the inch.

Anatomy

The bone trapezoid is the osseous element most distal of the column of the inch.

It is articulated with:

• Os scaphoïde (or bone naviculaire)
• trapezoidal Os (or trapezoïdum)
• 1st and 2nd Métacarpien S

Pathology