Lateral third of clavicle- Prognostic index

Robinson et al calculated the projected risk of non union following fractures of the lateral third of the clavicle treated non operatively.

Use calculator below to calculate the prognostic index, then look up on the graph to estimate probability of fracture remaining un united at 6, 12 and 24 weeks respectively.

Prognostic index calculator

Lateral third

Enter 1 for displaced fracture, Enter 0 for undisplaced fractures

Age of patient in years



Prognostic index = [-0.97 x (1 if displaced or 0 if undisplaced)] + [-0.02 x (age of patient in years)]


Robinson CM, Court-Brown CM, McQueen MM, Wakefield AE. Estimating the risk of nonunion following nonoperative treatment of a clavicular fracture. J Bone Joint Surg Am. 2004 Jul;86-A(7):1359-65.

Last updated 11/09/2015