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Automatic Digital PE Wear Measurement for Total Hip Arthroplasty

Develop a fully automatic program using cross-correlation and edge detection for measuring wear in total hip arthroplasty X-rays. Simulation tests showed accurate results with potential for clinical validation and improvement.

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Automatic Digital PE Wear Measurement for Total Hip Arthroplasty

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  1. Abstract [Background] Quantifying the amount of wear is important for total hip arthroplasty because we can predict the prognosis early. Many digital methods have be reported, none of them are fully automatic. Using the cross correlation and edge detection operators, we developed a fully automatic program which can automatically recognize the prosthesis and measure the wearing. [Methods] We simulated 64 hip X-rays using simulator, including two different abduction angles, two different anteversion angles, four different superior wearings, and four medial wearings. All 64 wearings are measured by our method. We also collect 88 real hip X-rays. The wearing of the 88 X-rays are measured by Livermore’s method and our method. Then we compare the detection rate. [Results] With simulated radiographs,only 3 misdetections are found. The error of medial wear is -0.023±0.176mm. The error of upper wear is -0.152± 0.315mm. For real X-rays, detection rate of our method is 53.4% (47/88). The detection rate of Livermore’s method without aid is 23.9% (21/88). The detection rate of Livermore’s method with aid is 78.4% (69/88).   [Conclusions] We designed a program which can automatically measure polyethylene wear. We have tested it on simulated X-rays and the result. The future work is to increase the detection rate and clinical validation. Introduction Livermore’s method SIC03-P027 Automatic Digital PE Wear MeasurementChen-Kun Liaw1,3 Rong-Sen Yang2 Sheng-Mou Hou2 Chiou-Shann Fuh3 Tai-Yin Wu4En Chu Kong Hospital, Taipei Hsian, Taiwan1National Taiwan University Hospital, Taipei, Taiwan2 National Taiwan University, Computer Science and Information Engineering3Taipei City Hospital4 Martell method Shaver method Our method Methods • 64 Simulated X-rays • 2 different anteversions • 2 different inclinations • 4 different upper wearings • 4 different medial wearings • Compare results with simulated parameters • 88 real total hip arthroplasty X-rays • First 88 total hip arthroplasy X-rays in En Chu Kong Hospital • Digitalized by Sony S70 digital camera • No exclusion criteria Results • 64 simulated X-rays: • 61 excellent detections • Error of medial wear is -0.023±0.176mm • Error of upper wear is -0.152± 0.315mm Hardinge method excellent excellent excellent incorrect • Program measurable: 53.4% (47/88) • Accept minor error: 64.8% (57/88) • Livermore’s method measurable: 23.9% (21/88) • With aid: 78.4% (69/88) incorrect Conclusions excellent • We designed a program which can automatically measure polyethylene wear. We have tested it on simulated X-rays and the result is encouraging. • Clinical validation and improving detection rate are the future work.

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