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

## TL;DR

This study shows that time-weighted graphs used in industry can also help assess medical implant angles in hip replacement surgery.

## Contribution

The novel application of time-weighted control charts in evaluating acetabular component inclination in hip surgery.

## Key findings

- Acetabular inclination angles were within control limits and showed a random pattern.
- Time-weighted charts provided a faster visual decision for quality control in medical settings.
- CUSUM, MA, and EWMA charts were effective in monitoring acetabular component inclination.

## 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.