Radial paralysis is a well-known complication of plate osteosynthesis on the humeral shaft. At the University Hospital Basel, these fractures have been treated in an adapted procedure with long PHILOS plates using a modified technique and approach. This study is to retrospectively analyze the effectiveness of the surgical technique in relation to iatrogenic radial paralysis.

Radial paralysis is a well-known complication of plate osteosynthesis on the humeral shaft. With regard to surgical treatment, there are major differences in terms of surgical access and implant selection. At the University Hospital Basel, these fractures have been treated in an adapted procedure for about 10 years. A long Philosplatte (Synthes company) is inserted from the proximal end via a deltoido-pectoral approach. This is a minimally invasive procedure (MIPO = minimally invasive plate osteosynthesis). The standard implant is first twisted distally by approx. 45°-90° and then lies anterior to the humerus. The distal screws can then be filled via anterior stab incisions. This adapted surgical technique is adapted to the anatomical course of the radial nerve. This ensures a safe distance from the plate/access to the nerve. The nerve does not have to be explored openly and the distal row of screws can be used minimally invasively via stab incisions. This study is to retrospectively analyze the effectiveness of the surgical technique in relation to iatrogenic radial paralysis.

Inclusion Criteria:

• surgery at the University Hospital Basel between 06/2010 and 12/2020 for a proximal humeral shaft fracture

Exclusion Criteria:

• Patients with a documented rejection

All patients aged 18 and over who underwent surgery at the University Hospital Basel between 06/2010 and 12/2020 for a proximal humeral shaft fracture