Lauge-Hansen classification of ankle fractures is based on the mechanism of trauma. It describes position of the foot (supination or pronation) and the direction of the applied force (abduction, adduction, external rotation) at the time of the injury. Therefore, it uses two word description of its types. The five main groups can be subdivided into stages according to the degree of severity.

Danis-Weber classification, commony abbreviated as Weber classification of ankle fractures, divides distal fibular factures into three types according to the relation of the fracture line to the distal tibiofibular syndesmosis.

Pipkin classification system divides fractures of the femoral head into four basic types according to relation of fracture line to the fovea capitis femoris and associated injury of the femoral neck or the acetabulum. It was first published in 1957.

Ideberg classification of glenoid fractures has five basic types. It is based on evaluation of 
338 glenoid fractures and was published in 1995.

Milch classification system divides simple fractures of the lateral condyle into two basic types.

Gartland classification is used for classification of supracondylar fractures that are common in children. It divides them into three types according to displacement of fragments.

Müller classification of distal humeral fracture is part of the AO scheme. This region is marked 13, so each type has this prefix, e.g. 13-A1.

Calculating doubling time of focal lesions or massess can give a hint, whether it has a malignant or rather benign growth dynamics. Doubling time of malignant lesions is between 30 and 500 days with a median of 100 days.

Crowe et al. classified adult developmental dysplasia of the hip (DDH) into four grades according to the extent of underlying subluxation on AP x-ray of the pelvis.

Brooker classification divides heterotopic ossifications that form following total hip replacement to four classes. It was published in 1973 by Brooker et al.