The correct prosthesis head size can be measured on the retrieved humeral head. enlarge

The correct prosthesis head size can be measured on the retrieved humeral head. In cases of comminution an x-ray of the contralateral humeral head will be used to determine the appropriate size.

Note: The humeral head is not spherical. Measure the smallest diameter.


If an x-ray is used to determine the size of the humeral head use a marker ball to compensate for radiological magnification. enlarge

Note: If an x-ray is used to determine the size of the humeral head use a marker ball in order to compensate for any radiological magnification.


The correct size of the humeral head can also be assessed by direct comparison with a trial head. enlarge

The correct size of the humeral head can also be assessed by direct comparison with a trial head.


The posteromedial metaphyseal extension (h) determines the implantation height of the prosthesis. enlarge

Determine the posteromedial metaphyseal extension

The posteromedial metaphyseal extension (h) determines the implantation height of the prosthesis. It can be measured easily with a ruler.