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Sacrococcygeal

By AGE2B team
May 28, 2021
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What are the sacral vertebrae?

The sacral vertebrae are located near the very bottom of the spinal column. They are located between the lumbar spine and the tailbone, which is also called the coccyx.

The sacrum is shaped like a triangle. Its sacral vertebrae are fused together into one solid bone.

The first three sacral vertebrae come together and form wide bony wings. These are called alae and they connect to the pelvis. Part of the sacral vertebrae helps to form the back section of the pelvic girdle and the sacral vertebrae join the hips at the sacroiliac joints.

Blood vessels and nerves travel through four openings on the right and on the left side of the sacral vertebrae.  The vertebral canal ends in the center of the end of the sacral canal.

A severe traumatic accident or fall can result in a fracture of the sacral vertebrae, but when this area of the spine is healthy, fractures rarely occur. People who have rheumatoid arthritis or a condition that causes loss of bone mass, such as osteoporosis, may develop fatigue fractures or stress fractures to the sacral vertebrae.

Pain in the lower back pain or legs or radiating pain from the back to the leg, known as sciatica, often occurs with injuries to the back where the lower back and sacral vertebra meet (L5 – S1). This is common due to the twisting and stress this area is subjected to during prolonged periods of sitting and during some sports activities.

Sacroiliac Joint Dysfunction

The sacral vertebrae area in women in shorter and wider in most women than it typically is in men.  Sacroiliac joint dysfunction is a condition that causes low back pain that tends to be worse on one side and travels down the thigh to the knee or even the ankle and foot. It is more common in younger and middle-aged women than in men.

The exact cause of sacroiliac joint dysfunction is difficult to determine. The normal movement of the joint between the sacral vertebrae and the ilium may be due to either too little motion in the joint or due to restricted movement of the joint. It is sometimes difficult for physicians to diagnose the problem because the symptoms are sometimes similar to those of a herniated disc. 

Sacrococcygeal Teratomas

What are sacrococcygeal teratomas?
These are tumors that rarely occur and develop at the base of the spine near the coccyx, which is commonly known as the sacrococcygeal area of the spine. Most sacrococcygeal teratomas are non-cancerous, however, the tumors may still grow larger and may need surgical removal. It is rare for sacrococcygeal teratomas to be cancerous at birth and a lot of them may become malignant if not treated early.
Causes of Sacrococcygeal Teratomas
There is no definite cause of sacrococcygeal teratomas. It is found that sacrococcygeal teratomas are germ cell tumors which are cells that develop in the embryo and soon becomes the cells that compose the male and female reproductive system.

Prevalence

Sacrococcygeal teratomas often occur in women than men by a 4:1 ratio. However, the malignancy of tumors is more common in men. Sacrococcygeal teratomas are found to be present between 1 in 70,000 live births. This disease rarely occurs in adults, but most adult cases are due to tumors that were present at birth but was not detected until the individual’s adulthood.

The Coccyx

The coccyx, also known as the “tail bone” is a structure in the shape of a triangle at the very end of the sacral vertebral. It is made up of three to five (most often four) small vertebrae that don’t resemble other vertebrae. They look like small pieces of solid bone that are joined to each other by fibrous, cartilage-like tissue. The coccyx is joined to the sacral vertebrae by a joint made up of this same type of fibrous, cartilage-like material, and this joint allows for a minimal amount of movement. The vertebrae of the coccyx typically fuse between the ages of 20 and 30.

All about the Spinal Cord.

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