Optimal viewing angles of intraoperative fluoroscopy for detecting screw penetration in proximal humeral fractures: a cadaveric study.

Abstract:

BACKGROUND:To identify the optimal viewing angles for every proximal screw in PHILOS plate-fixed proximal humeral fractures. METHODS:Three fresh-frozen human cadaveric bodies with six intact shoulders were studied. All three bodies were put in the beach chair position and PHILOS plates were placed on the proximal humerus. Head screws penetrating 1 mm into the joint were fitted one by one. Fluoroscopy was conducted in the 180° horizontal plane and the 120° coronal plane to analyze each screw's penetration in every shoulder. Images were taken every 5°, then all images were analyzed to identify the sensitive angles. RESULTS:The range of optimal viewing angles to visualize penetration of every head screw was identified. In the coronal plane, the angles in the range between 0° and 10° were sensitive to all screws except No. 8 and No. 9. Furthermore, penetration of screws No. 8 and 9 could not be identified on any axillary view, but could be identified in the horizontal plane from - 30° to - 10° and from 10° to 35° respectively. CONCLUSIONS:We recommend a 0°-10° axillary view with 30° arm abduction combined with two horizontal angles in the range of - 30° to - 10° and 10° to 35° for routine fluoroscopy during surgery. Our results will be helpful in avoiding primary screw penetration.

authors

Wang Q,Liu Y,Zhang M,Zhu Y,Wang L,Chen Y

doi

10.1186/s12891-018-2247-8

subject

Has Abstract

pub_date

2018-09-07 00:00:00

pages

320

issue

1

issn

1471-2474

pii

10.1186/s12891-018-2247-8

journal_volume

19

pub_type

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