Imaging findings and treatment in coccydynia - update of the recent study findings.

  · The etiology of coccydynia usually includes trauma, obesity and female sex, special coccyx morphology, and coccygeal hypermobility.. · Coccyx fractures are defined into three groups as flexion type 1, compression type 2, and extension type 3.. · When evaluating coccydynia, the first step is a dynamic X-ray examination of the coccyx in standing and sitting position.. · Hypermobility is defined as more than 25 % posterior subluxation while sitting or more than 25° flexion while sitting.. · More than 35° posterior subluxation is considered significant hypermobility..