Thus, this is the main difference between sacrum and coccyx. Furthermore, the sacrum is formed by the fusion of 5 vertebrae S1-S5 while the coccyx is formed by the fusion of 3 to 5 vertebrae C1-C5. Hence, this is another difference between sacrum and coccyx. Moreover, their location is also an important difference between sacrum and coccyx. While sacrum is located just below the fifth lumbar vertebra L5 in between the hip bones, coccyx is located just below the sacrum.
The alae of sacrum form L-shaped sacroiliac joints with the ilium and the sacrum forms the lumbosacral joint with the fifth lumbar vertebrae while coccyx articulates with the sacrum through coccygeal cornua.
Also, one other difference between sacrum and coccyx is that sacrum is not a vestigial structure while coccyx is a vestigial structure. Besides, sacrum has a weight-bearing and stabilizing function while coccyx has a stabilizing function during sitting.
So, this is also a difference between sacrum and coccyx. The sacrum is a mass of bones located just below the fifth lumbar vertebra. Also, it articulates with the ilium to form the pelvis. Therefore, it has a weight-bearing and stabilizing function at the bottom of the spine. In contrast, coccyx or the tail bone is the final part of the spinal column. It is considered as a vestigial structure as it has no prominent function in the skeleton.
However, it helps to stabilize the body while sitting. Both sacrum and coccyx are two bones occur at the bottom of the spinal column. However, the main difference between sacrum and coccyx is their structure and role. Eidelson, Stewart G. Jun 19, CC BY 3. Figure 1: The Sacrum.
Figure 2: The Coccyx. View all posts. Leave a Reply Cancel reply. The sacrum is a triangular-shaped bone and consists of five segments S1-S5 that are fused together. A healthy sacral region is rarely fractured except in instances of serious injury, such as a fall or trauma to the area. However, patients with osteoporosis or rheumatoid arthritis are inclined to develop stress fractures and fatigue fractures in the sacrum. Back pain or leg pain sciatica can typically arise due to injury where the lumbar spine and sacral region connect at L5-S1 because this section of the spine is subjected to a large amount of stress and twisting during certain activities, such as sports and sitting for long periods of time.
The sacrum is wider and shorter in women than in men. Young and middle age women are more susceptible to developing sacroiliac joint dysfunction, a condition in which pain typically concentrates on one side of the low back and radiates down the leg to the knee or at times, to the ankle or foot. While the exact root of the pain is difficult to pinpoint, disruption of the normal joint motion between the sacrum and ilium is a likely source of pain arising from either:.
Watch: Sacroiliac Joint Dysfunction Video. Sacroiliac joint dysfunction is also difficult to accurately diagnose since the pain symptoms resemble those associated with a herniated disc and sciatica. The coccyx also called the tailbone is located at the base of the spine and is composed of four vertebrae.
Unlike the individual vertebrae in other regions of the spine, the vertebrae in the sacral region as well as the coccyx are fused. See Anatomy of the Coccyx Tailbone. When sitting, the coccyx shifts forward and acts as a shock absorber. However, falling on the tailbone or events such as childbirth can lead to coccygeal pain, known as coccydynia.
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