The plate on the ulna can be positioned under the extensor carpi ulnaris muscle (A), under the flexor carpi ulnaris muscle (B), or in the interval between extensor and flexor carpi ulnaris muscles (C). With a more proximal fracture it can be more difficult to place the plate underneath the extensor muscle. With more distal fractures, plates should be placed in the interval between the extensor and flexor carpi ulnaris muscles (C).
While plate position on the tensile (subcutaneous) aspect of the ulna (C) is biomechanically preferable, plate prominence can be a problem and cause irritation. To avoid too superficial position of the plate, it can be placed towards positions (A) or (B) where it will be covered by the muscle compartment.
In oblique fractures, the plate position should consider the fracture morphology. It is preferable to insert the lag screw through the plate, if possible.
In the following procedure, we demonstrate the plate positioned deep to the extensor carpi ulnaris muscle (A).