[1] Among isolated incidents the capitate and hamate bones are the next most common to fuse followed by the pisiform-triquetrum, trapezium-trapezoid, scaphoid-capitate, and triquetrum-hamate.

[3] Carpal coalitions may further be divided into four subtypes:[3] Generally since carpal-carpal fusions do not cause unease or discomfort for the patient, and do not impair wrist function, treatment is not needed.

However, in the minority of cases where carpal coalition causes persistent pain, arthrodesis, or the surgical fusion of a joint, has been proven to be beneficial.

[5] Carpal coalition occurs at a ratio of 2:1 in females, and are considered to have a multifactorial inheritance pattern.

[3] Further, the incidence according to race varies, with a rate of 0.1% in Caucasian populations, 1.6% in African American populations, and over 8% in certain West African tribes.