Type:
Educational Exhibit
Keywords:
Inflammation, Education and training, Normal variants, Education, MR, Digital radiography, CT, Musculoskeletal system, Musculoskeletal bone, Bones
Authors:
I. Stratulat, M. Mustapic, K. Abdul-Hussaen; Borås/SE
DOI:
10.26044/ecr2019/C-1554
Background
Sesamoid and accessory bones are small,
nodular or ovoid,
well-corticated bony structures,
being located close to a bone or a joint.
Accessory bones derive from unfused ossification centers or from previous trauma.
The most frequently encountered accessory bones in foot and ankle are os trigonum and accessory navicular bone.
Sesamoid bones are partially or totally embedded in tendons,
being a part of the gliding mechanism and thus protecting them from injury by reducing friction.
The most frequently encountered sesamoid bones in foot are hallux sesamoids.
Even if common they are considered incidental findings,
without any connection to the clinical presentation of the patient,
eventually they can be the subject of pathologic processes and cause painful syndromes.