Table I.

Descriptions of the used International Classification of Diseases (ICD)-10 codes.

ICD-10 codes nonunion	Description
M84.1	Nonunion of fracture
M84.11	Shoulder region (clavicula, scapula, acromioclavicular-, glenohumeral-, sternoclavicular joint)
M84.12	Upper arm (humerus)
M84.13	Forearm (radius, ulna, scaphoid)
M84.14	Hand (finger, carpus, metacarpal)
M84.15	Pelvic region and thigh (pelvis, femur)
M84.16	Lower leg (fibula, tibia)
M84.17	Ankle and foot (tarsal, metatarsal, toes, ankle)

ICD, International Classification of Diseases.