A wear formulation of total hip prosthesis for salat activity

The wear on the acetabular liner surface of total hip prosthesis due to human activity cannot be avoided. Salat is an obligation religious activity for Muslims performed five times daily, without exception for patients who used the total hip prosthesis. Salat consists of standing, bowing, prostrating and sitting on the leg motions. Many researchers have investigated the wear on the liner surface for daily activity but not for salat activity. This study has aimed to calculate wear on the acetabular liner surface due to salat activity. A new linear wear model has been proposed in order to estimate the linear wear or the wear depth on the acetabular liner surface. In addition, a volumetric wear model or volume loss on the acetabular liner surface has also been developed based on the new linear wear model. These wear model are used to calculate wear on the acetabular liner surface due to walking and salat activities. Results show that the linear wear due to salat activity is lower than walking activity, because of the intensity of salat activity is lower than walking. However, the combinations of both wear due to walking activity and salat activity need to be considered.