New Expandable Stem Trial
Determining the correct height and version is considered the most difficult step when treating a shoulder fracture with hemiarthroplasty. In most cases, there is no proximal bone remaining. Holding the trial in place while reducing the joint is a challenge and may require extramedullary instrumentation or jigs to support the trial.
The expandable stem trial eliminates the need for extramedullary positioning jigs. Proper height is obtained by matching landmarks from trial to implant. A modular version rod can be used to aid in positioning the expandable trial. The expandable trial locks into the canal with a simple half turn of a T-handle and functions by tightening a bolt within the trial, using a T-handle connected to a 5mm hex driver.