Diaphyseal screw prominence in distal radius volar plating

Eng, Kevin, Gill, Stephen and Page, Richard 2020, Diaphyseal screw prominence in distal radius volar plating, Journal of wrist surgery, vol. 9, no. 3, pp. 214-218, doi: 10.1055/s-0040-1702930.

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Title Diaphyseal screw prominence in distal radius volar plating
Author(s) Eng, Kevin
Gill, StephenORCID iD for Gill, Stephen orcid.org/0000-0001-8722-0572
Page, RichardORCID iD for Page, Richard orcid.org/0000-0002-2225-7144
Journal name Journal of wrist surgery
Volume number 9
Issue number 3
Start page 214
End page 218
Total pages 5
Publisher Thieme Publishing
Place of publication New York, N.Y.
Publication date 2020-03
ISSN 2163-3916
2163-3924
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Orthopedics
distal radius
screw penetration
X-ray
internal fixation
Summary Background Volar plating for distal radius fractures has become common. Screw prominence on the dorsal side from long screws can lead to tendon injury. Methods for detecting screws that penetrate the far cortex involve X-ray or ultrasound. These have focused on the distal row of screws. No studies have addressed screw penetration in the diaphysis. We describe two cases where diaphyseal screws caused symptoms. We then insert screws in the diaphysis of synbones 2 mm longer than measured and determine what angle of pronation or supination was best to detect this on X-ray. Methods Three synbones were plated using Synthes volar plate. The three diaphyseal screws were drilled perpendicular to the plate, and the depth measured. Cortical 2.4-mm screws were inserted, 2 mm longer than measured. The three synbones were then placed in a custom clamp to measure rotation. Lateral X-rays were taken at 0 degree rotation, and 5, 10, and 15 degrees of supination and pronation. The prominence of each screw was measured using the synapse digital ruler. Results For the screws that were placed at a neutral angle (perpendicular to the plate) the maximum visualization of the prominent tips occurred around 0 degree rotation. With screws angled 15 degrees ulna, maximum visualization was between 5 and 10 degrees of pronation. With screws angled 15 degrees radial, maximum visualization was between 5 and 10 degrees of supination. Every 5 degrees of rotation changes the profile of the screw by 0.4 mm. Discussion The diaphysis of the radius becomes approximately trapezoidal distally. Prominent screws that are placed below the “peak” of the trapezoid may appear to be the correct length. Rotating the wrist into pronation or supination to bring the relevant cortex as parallel to the X-ray beam as possible will help to identify if screws are of the correct length. Screws that are prominent in the second compartment may be particularly symptomatic as the tendons here are closely opposed to the bone. We recommend screening for 2 mm diaphyseal screw prominence in neutral, with 10 degrees of pronation and supination.
Language eng
DOI 10.1055/s-0040-1702930
Indigenous content off
Field of Research 110399 Clinical Sciences not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30135685

Document type: Journal Article
Collections: Faculty of Health
School of Medicine
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Created: Thu, 19 Mar 2020, 14:00:46 EST

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