*Article* **Tresca Stress Simulation of Metal-on-Metal Total Hip Arthroplasty during Normal Walking Activity**

**Muhammad Imam Ammarullah 1,2,\* , Ilham Yustar Afif 1,2 , Mohamad Izzur Maula 1,2 , Tri Indah Winarni 2,3,4 , Mohammad Tauviqirrahman <sup>1</sup> , Imam Akbar <sup>5</sup> , Hasan Basri <sup>5</sup> , Emile van der Heide <sup>6</sup> and J. Jamari 1,2,\***

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**Abstract:** The selection of biomaterials for bearing in total hip arthroplasty is very important to avoid various risks of primary postoperative failure for patients. The current investigation attempts to analyze the Tresca stress of metal-on-metal bearings with three different materials, namely, cobalt chromium molybdenum (CoCrMo), stainless steel 316L (SS 316L), and titanium alloy (Ti6Al4V). We used computational simulations using a 2D axisymmetric finite element model to predict Tresca stresses under physiological conditions of the human hip joint during normal walking. The simulation results show that Ti6Al4V-on-Ti6Al4V has the best performance to reduce Tresca stress by 45.76% and 39.15%, respectively, compared to CoCrMo-on-CoCrMo and SS 316L-on-SS 316L.

**Keywords:** Tresca stress; metal-on-metal; total hip arthroplasty; normal walking activity
