Tail Bone Pain

 By: Erik Dalton
Many of today's medical texts tell us the coccyx fuses into one rigid segment by adulthood in most people. However, several well-designed studies have shown that a normal coccyx should have two or three movable parts that gently curve forward and slightly flex as we sit. Two medical papers (Postacchini and Massobrio1 and Kim and Suk2) found that test subjects with fused coccyxes that didn't flex upon sitting were more prone to experience tailbone pain than those with a normal coccyx. Postacchini and Massobrio performed radiographic studies of 171 coccyxes, and found less than 10 percent were fused into one piece...nearly all had two or three, and a few had four segments. The key conditions they found to be associated with coccyx pain were: coccyx angled sharply forward; coccyx side-bending more to one side than the other; and coccyx completely rigid (all segments fused together and fused to the sacrum).

Even though none of the abnormalities listed above always cause pain, clients seem more likely to experience coccyx problems when one or more of these conditions exist. Over the years, I have noticed clients with especially long coccyxes also seem more likely to report local tenderness and pain. Although not reported in the literature, it seems clear that a long coccyx would be more likely to suffer damage than a shorter one.

Why some hurt and others don't is uncertain. In the case of a misaligned coccyx, it might be that the pain is brought about by the coccyx pulling on muscles, ligaments or overstretching the filamen terminale (end of the dural tube). Connective tissues called the filum durae spinalis enclose the end of the spinal cord and attach it to the deep dorsal sacrococcygeal ligament.

Idiopathic head and low back pain syndromes regularly manifest when a distorted coccyx tugs on the dural tube, causing reverberating tensional forces to travel all the A major source of hip and back pain occurs as fibrotic sacrococcygeal ligaments anteriorly flex (hook) the coccyx and compress/overstretch the sensitive filum terminale (Fig.1). In the case of a rigid coccyx, it might be that the tissues under the inferior segments might generate a pad of irritated tissue (like a bunion) that can rub the dura raw. But the most widespread pain-generator helped by manual therapists is neuroreceptor pain from a misaligned sacrococcygeal joint way up to the occiput.

Coccydynia (Coccyx Pain)
When sitting, the coccyx shifts forward and acts as a shock absorber. Yet, falling on the tailbone or events such as childbirth can lead to coccygeal pain, known as coccydynia. In most cases, the pain is caused by an unstable coccyx, resulting in chronic inflammation of the sacrococcygeal joint. Coccydynia also can be attributed to a malformed or dislocated coccyx and the growth of bony spurs on the coccyx. Resulting pain often is resolved by performing specific soft tissue techniques to release the levator ani muscle, anococcygeal, sacrotuberal and sacrospinal ligaments, as well as the gluteus maximus muscles.

Another common etiology is childbirth. The coccyx is considered by some to be in the way during childbirth. At the end of the third trimester, specific hormonal changes enable the synchondrosis between the sacrum and the coccyx to soften and become more mobile. This increased mobility of three to five coccygeal segments allows for more flexion and extension, which might permanently vary the resting tension of the surrounding ligaments and muscles. Unlike fractures, which can remodel, injuries to the sacrococcygeal junction often become inflamed as the joint is repeatedly forced out of its normal position. Physical examination should involve direct palpation of the coccyx for tenderness. In true coccydynia, the coccygeal region usually is markedly tender. If the client reports coccygeal pain although is not tender upon palpation, the therapist should refer out for an orthopedic workup to rule out lumbar disk disease.
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