What type of fracture is typically associated with a sesamoid bone?

• A. Spiral or oblique fracture
• B. Comminuted or transverse fracture
• C. Greenstick fracture
• D. Compound fracture

Answer: (B)

Sesamoid bones, which are small, round bones commonly found in tendons, most notably the patella in the knee and the sesamoids of the first metatarsophalangeal joint in the foot, often experience specific types of stresses and strains during movement. The fracture type most commonly associated with sesamoid bones is the comminuted or transverse fracture.

Comminuted fractures occur when the bone is fragmented into multiple pieces, often as a result of significant force or repetitive pressure, which aligns with the stress experienced by sesamoid bones during activities like running or jumping. Alternatively, transverse fractures are characterized by a horizontal break across the bone, which can happen if a direct force is applied. Both types highlight the susceptibility of sesamoid bones to injury due to their positioning and function in weight-bearing activities.

The other fracture types, such as greenstick fractures, which typically occur in young, developing bones and are not applicable here, and compound fractures, which involve an open wound and expose bone, are less frequently seen in sesamoid bones due to their location and the manner in which they are loaded. Spiral or oblique fractures similarly do not represent the most typical injury pattern associated with sesamoids, as they result