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BioMed Research International
Volume 2015, Article ID 129610, 6 pages
http://dx.doi.org/10.1155/2015/129610
Research Article

To Compare Time-Weighted Graphs to Evaluate the Inclination of the Acetabular Component of Patients Who Had Total Hip Replacement Surgery

1Department of Biostatistics and Medical Informatics, Faculty of Medicine, Ondokuz Mayis University, 55139 Samsun, Turkey
2Department of Orthopedics and Traumatology, Faculty of Medicine, Ondokuz Mayis University, 55139 Samsun, Turkey

Received 4 November 2014; Accepted 20 January 2015

Academic Editor: Juan A. Sanchis-Gimeno

Copyright © 2015 Leman Tomak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Time-weighted graphs are used to detect small shifts in statistical process control. The aim of this study is to evaluate the inclination of the acetabular component with CUmulative SUM (CUSUM) chart, Moving Average (MA) chart, and Exponentially Weighted Moving Average (EWMA) chart. The data were obtained directly from thirty patients who had undergone total hip replacement surgery at Ondokuz Mayis University, Faculty of Medicine. The inclination of the acetabular component of these people, after total hip replacement, was evaluated. CUSUM chart, Moving Average chart, and Exponentially Weighted Moving Average were used to evaluate the quality control process of acetabular component inclination. MINITAB Statistical Software 15.0 was used to generate these control charts. The assessment done with time-weighted charts revealed that the acetabular inclination angles were settled within control limits and the process was under control. It was determined that the change within the control limits had a random pattern. As a result of this study it has been obtained that time-weighted quality control charts which are used mostly in the field of industry can also be used in the field of medicine. It has provided us with a faster visual decision.