*2.4. Radiographic Evaluation*

Preoperative radiographic assessments were made on standardized true AP, axillary and Y-view images. A CT scan was also performed to classify the head-split fracture type [7] and determine the presence of any additional glenoid rim fractures. The arrangemen<sup>t</sup> of patterns depends on the involvement of the head-split component adjacent tuberosity (Figure 2).

**Figure 2.** Four different types of head-split fracture patterns depending on involvement of the head-split component adjacent tuberosity (**Type I**: greater tuberosity; **Type II**: lesser tuberosity), whether fracture fragments split into disconnecting pieces that may lead to a stamp-like fracture pattern resulting in both greater and lesser tuberosity fragments connected to the articular face (**Type III**) or the multifragmentation of the disconnection of split pieces (**Type IV**) [7]. (Reproduced, with modification, under Creative Commons Attribution 4.0 International. License [https://creativecommons.org/licenses/by/4.0/ (accessed on 1 January 2022)], from: [7].

Postoperative evaluations were also made on true AP, axillary and Y-view radiographs to identify osteolysis, prosthetic loosening, heterotopic ossification and calcification, and scapular notching as well as tuberosity healing or migration. All radiographic examinations were evaluated by two independent surgeons, one of which was not involved in the surgical procedure.
