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25 February 2018 : Clinical Research  

Assessment of Screw Length of Proximal Humerus Internal Locking System (PHILOS) Plate for Proximal Humeral Fractures Using Three-Dimensional Computed Tomography Scan

Minfei Qiang1ABCD, Xiaoyang Jia1ABCD, Yanxi Chen1ACD*, Kun Zhang1BDE, Haobo Li1DEF, Yuchen Jiang1DEF, Yijie Zhang1EF

DOI: 10.12659/MSM.906355

Med Sci Monit 2018; 24: CLR1158-1165

Abstract

BACKGROUND: Screw perforation and varus collapse are common complications of treatment with a PHILOS (proximal humerus internal locking system) plate for proximal humerus fractures, which are associated with improper screw length selection and lack of medial column support. The purposes of this study were: (1) to measure the proper length of periarticular screws of the PHILOS plate in the humeral head, and (2) to determine what factors influence the screw length and implantation of the inferomedial support screw.

MATERIAL AND METHODS: Computed tomography (CT) images of the normal proximal humerus in 134 cases were retrospectively reviewed. The length of periarticular screws was measured using three-dimensional (3D) techniques. Intraobserver and interobserver reliability of measurement were evaluated using intraclass correlation coefficients (ICCs). Sex and body height influences on screw length and implantation of the inferomedial screw were analyzed.

RESULTS: All measurements had excellent agreement (ICC>0.75). The screw length and implantation rate of the inferomedial screw were greater in males than in females. Positive correlations were observed between body height and screw length and implantation of the inferomedial screw (all P<0.001).

CONCLUSIONS: The screws were longer and the implantation rate was higher for inferomedial screws in males than in females, and were positively correlated with body height. Our data can be used as a reference for surgeons to reduce the number of times screws are changed intraoperatively and to reduce operation duration and minimize use of intraoperative fluoroscopy for proximal humerus fractures treated with the PHILOS plate.

Keywords: Bone Screws, Image Processing, Computer-Assisted, Imaging, Three-Dimensional, multidetector computed tomography, Shoulder Fractures

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750