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Media Gallery

Lateral view of the pelvis and coccyx. The bracket shows the area of focus for radiographs that would provide a coned-down view of mainly the coccyx and distal sacrum. A more common lateral view would often also include larger bony structures, such as the lumbar spine and femur, all of which would make it difficult to optimize visualization of the small bones of the coccyx. In patients with coccyx pain, these coned-down, lateral views of the coccyx can provide important diagnostic information. Coned-down images obtained in the weight-bearing (seated) position can be compared with those obtained in a non–weight-bearing position (eg, side lying), thus allowing assessment for dynamic instability (eg, dislocations that occur only while seated).
Coccyx pain (coccydynia, or tailbone pain) is typically worse when the patient is sitting. Often, the pain is even worse when sitting leaning slightly backward, since this increases the weight bearing on the coccyx, as shown in this image. Dynamic radiographs of the coccyx involve obtaining coned-down (focused) views of the coccyx while the patient is seated (eg, in his or her most painful position). Often, this involves having the patient lean backward 0-40°, depending on the symptoms. Radiographs obtained in this position are compared with those obtained in a non–weight-bearing position (eg, side lying) to assess for instability or dislocations in the seated position.
Patients with a painful coccyx often find it more comfortable to sit leaning slightly forward, as shown in this image. This forward-leaning position minimizes any weight bearing on the coccyx itself and thus minimizes the exacerbation of coccyx pain. As shown, when a patient sits leaning forward, most of the weight bearing occurs bilaterally through the inferior ischial regions of the pelvis and the posterior thigh (femur) regions.

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Author

Patrick M Foye, MD Director of Coccyx Pain Center, Professor of Physical Medicine and Rehabilitation, Rutgers New Jersey Medical School; Co-Director of Musculoskeletal Fellowship, Co-Director of Back Pain Clinic, University Hospital

Patrick M Foye, MD is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation

Disclosure: Nothing to disclose.

Coauthor(s)

Charles J Buttaci, DO, PT Pain Management, Northeast Orthopedics

Charles J Buttaci, DO, PT is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, American Osteopathic College of Physical Medicine and Rehabilitation, International Spine Intervention Society

Disclosure: Nothing to disclose.

Chief Editor

Dean H Hommer, MD Chief Medical Officer, Corpus Christi Medical Center

Dean H Hommer, MD is a member of the following medical societies: American Academy of Pain Medicine, American Academy of Physical Medicine and Rehabilitation, American Association for Physician Leadership, American Association of Neuromuscular and Electrodiagnostic Medicine, American College of Healthcare Executives, Texas Medical Association

Disclosure: Nothing to disclose.

Additional Contributors

Gerard J D'Onofrio, MBA Rutgers New Jersey Medical School

Gerard J D'Onofrio, MBA is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, American Association for Physician Leadership, American College of Physicians, American Medical Association, Beta Gamma Sigma, Biomedical Entrepreneurship Network

Disclosure: Nothing to disclose.

Acknowledgements

Michael T Andary, MD, MS Professor, Residency Program Director, Department of Physical Medicine and Rehabilitation, Michigan State University College of Osteopathic Medicine

Michael T Andary, MD, MS is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, American Association of Neuromuscular and Electrodiagnostic Medicine, American Medical Association, and Association of Academic Physiatrists

Disclosure: Allergan Honoraria Speaking and teaching; Pfizer Honoraria Speaking and teaching

Debra Ibrahim New York College of Osteopathic Medicine