One of factors that could affect the implant alignment in total hip arthroplasty (THA) is the installation instrument designs. In patient-specific cases, the instruments are needed to match the patient's bone morphometry. The goal of this study is to develop a femoral broach and acetabular reamer with shape and size that match the patient's computed tomography (CT) scan data. The femoral broach was designed by evaluating a femoral stem based on the anthropometrical data of the femur, drawing a broach on the surface of the stem, and building a handle that will attach to the double offset broach handle. The acetabular reamer was designed by analyzing the acetabulum and acetabular shell, drawing a conventional reamer based on the acetabulum diameter and height of the acetabular shell, and designing a connector with a X shape. The range of the femoral broach is a 1–2 mm distance to the femoral stem and has distance of 3–4 mm from the cancellous bone to facilitate good osseointegration. As a result, the designed reamer has a height of 24.61 mm, a half-ball diameter of 41.91 mm, teeth with the shape of a quarter ball, and a size of 8.28mm. The acetabular reamer has a similar diameter to the acetabulum. In conclusion, based on the experimental test through three-dimensional (3D) printing technology, the femoral broach and the acetabular reamer can fit well in the proximal femur and acetabulum and are expected to aid better during THA procedures.