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Disc calibration for digital templating in hip replacement.

A Kulkarni¹, P Partington, D Kelly

¹Wansbeck General Hospital, Ashington, England. ashwin_kulkarni@hotmail.com

The Journal of Bone and Joint Surgery. British Volume

|December 2, 2008

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A new disc calibration method simplifies digital hip imaging. This technique is more accurate and reliable than traditional sphere methods, improving pre-operative templating in digital radiography.

Area of Science:

Radiology
Medical Imaging
Orthopedics

Background:

Digital radiography is increasingly used for hip imaging.
Accurate pre-operative templating requires calibration objects, which can be difficult to position and cause patient discomfort.

Purpose of the Study:

To develop and validate a novel, patient-friendly calibration method for digital hip radiography.
To compare the accuracy and reliability of the new disc method against the traditional sphere method.

Main Methods:

A planar disc was designed to account for magnification in digital hip radiography.
Pelvic CT scans were analyzed to determine optimal disc dimensions.
The disc method was compared to the sphere method using reverse calibration on post-hip replacement radiographs.

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Main Results:

A disc of 37.17 mm diameter was calculated to be equivalent to a 30 mm sphere at hip center level.
The disc method demonstrated superior accuracy and reliability compared to the sphere method.
The technique was found to be robust, cost-effective, and acceptable to patients and radiographers.

Conclusions:

The disc calibration method offers a reliable, accurate, and patient-acceptable alternative for pre-operative templating in digital hip radiography.
This technique can be readily implemented in radiography departments with minimal preparation.