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The proximity of an easily fractured bone also contributes to prevent dislocation of certain joints—for example, fracture of the clavicle prevents an impinging force expending itself on the shoulder-joint; and the frequency of Colles' fracture of the radius, and of Pott's fracture of the fibula, doubtless accounts to some extent for the rarity of dislocation of the wrist and ankle-joints respectively.

Radiogram showing the Line of Fracture and Upward Displacement of the Radial Styloid in Colles' Fracture 104 46.

Colles' Fracture showing undue prominence of Ulnar Styloid 103 45.

The treatment is carried out on the same lines as in Colles' fracture.

Separation of the lower epiphysis of the radius, which is on the same level as that of the ulna and lies above the level of the synovial membrane of the wrist-joint, is comparatively common between the ages of seven and eighteen, especially in boys, and is caused by the same forms of violence as produce Colles' fracture.