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A Simplified Method for Determining the Safe Zone in Proximal Radial Plate Fixation.

Piyabuth Kittithamvongs¹, Prapasiri Chareonsri¹, Sopinun Siripoonyothai¹

¹Upper Extremity and Reconstructive Microsurgery Unit, Institute of Orthopaedics, Lerdsin Hospital, Department of Orthopaedic Surgery, College of Medicine, Rangsit University, Bangkok, Thailand.

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Summary

This summary is machine-generated.

This study introduces a new method for radial head plate fixation, ensuring no forearm rotation restriction. The technique safely identifies a suitable zone for implants, maintaining full range of motion.

Keywords:

Fixation radial head plate radial head/neck safe zone

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Area of Science:

Orthopedic surgery
Anatomy

Background:

The radial head and neck's anatomy presents challenges for plate fixation, potentially causing forearm rotation impingement.
Existing methods for identifying safe plate placement zones have limitations.

Purpose of the Study:

To propose and evaluate an alternative method for determining a safe zone for radial head and neck plate fixation.
To compare this new method with established techniques for identifying safe zones.

Main Methods:

The study utilized 30 embalmed cadavers with a full passive range of forearm rotation.
Plates were positioned anteriorly during pronation and posteriorly during supination.
Range of motion was assessed to detect proximal radioulnar joint impingement, and plate positions were compared to existing safe zones.

Main Results:

All specimens maintained a full passive range of motion after plate fixation in tested positions.
The proposed plate placement method resulted in fixation within established safe zones (Caputo and Smith).
The average plating zone measured 94 degrees.

Conclusions:

Positioning the plate anteriorly during pronation or posteriorly during supination offers a safe alternative for radial head fixation.
This method effectively avoids proximal radioulnar joint impingement.
All tested specimens achieved full range of motion, with plates located within standard safe zones.