What is an accessory ossification center?

What is an accessory ossification center?

Accessory ossicles are secondary ossification centers that remain separate from the adjacent bone. They are usually round or ovoid in shape, occur in typical locations and have well defined smooth cortical margins on all sides.

Why is the secondary ossification center important?

Secondary ossification centers for epiphyses and apophyses go through different stages of growth from the initiation of ossification to complete fusion. This evolution leads to variations in fracture patterns based on mechanism and anatomical location.

How common is OS Vesalianum?

Os vesalianum is rare and often an incidental finding. The incidence rate has been shown to be between 0.1 and 5.9% (6,11). Patients usually present with pain or tenderness at the lateral aspect of the foot, specifically at the area of the prominent fifth metatarsal styloid process.

Where are accessory bones found?

Accessory bones of the skull are found in various areas, usually arising in fontanelles and/or adjacent or along the sutures of the skull. The most common location that these accessory bones are found is at the lambdoid and lambdoid (posterior) fontanelle, with some arising at the masto-occipital suture.

What is the extra bone in your ankle called?

What Is the Os Trigonum? The os trigonum is an extra (accessory) bone that sometimes develops behind the ankle bone (talus). It is connected to the talus by a fibrous band.

What is an ossicle in the wrist?

Objective Accessory ossicles of the wrist are generally asymptomatic and detected incidentally as radiological findings. These bones are rarely symptomatic but can produce pain in cases of impingement or direct trauma.

What is primary and secondary ossification center?

The primary ossification center is the first place where the bone formation begins in the axle of a long bone or in the body of an irregular bone. Conversely, the secondary ossification center is the area of ossification that appears after the primary center of ossification at the epiphysis of edges of bones.

What is the function of ossification center?

An ossification center is a point where ossification of the cartilage begins. The first step in ossification is that the cartilage cells at this point enlarge and arrange themselves in rows.

What causes os Vesalianum?

The cause of Iselin’s disease is probably the repetitive microtrauma that occurs from the traction of the peroneus brevis tendon on the unfused apophysis, hence it is an overuse injury [8,11].

What are accessory bones?

An accessory bone or supernumerary bone is a bone that is not normally present in the body, but can be found as a variant in a significant number of people. It poses a risk of being misdiagnosed as bone fractures on radiography.

What are the accessory bones of the skull?

The accessory bones of the skull comprise the hyoid and the auditory ossicles. The hyoid is suspended in position by muscles and ligaments but it does not articulate with any other bone. The auditory ossicles are not visible upon external examination of the skull because they are housed inside the temporal bone.

Why do I have 2 ankles?

The presence of an os trigonum in one or both feet is congenital (present at birth). It becomes evident during adolescence when one area of the talus does not fuse with the rest of the bone, creating a small extra bone. Only a small number of people have this extra bone.