**1. Introduction**

In the last decade, hip arthroscopic surgery has become widely recognized as an effective option for the treatment of femoroacetabular impingement (FAI). In order to achieve optimal clinical results, it is essential to correct the bony impingement, and therefore, precise osteochondroplasty is one of the most important factors. However, it is not possible to predict the impingement point in each case based only on radiographic images [1]; and computer simulation modeling is important to provide three-dimensional identification. This is the starting point of computerassisted hip arthroscopy; thereafter, preoperative planning is conducted by virtual osteochondroplasty in a computer model, before transferring to a navigation system. Therefore, the computer-assisted tool not only provides surgical assistance, but also supports the preoperative planning. The real value of the computer navigation system lies in the ability to undertake precise preoperative planning, and it is difficult to achieve precise and reliable surgical results without computer navigation. After surgery, the area of impingement can be re-evaluated using postoperative computed tomography (CT) data. Furthermore, it is possible to validate the

**Figure 1.** *Flow of computer-assisted hip arthroscopy for FAI.*

mechanical bone strength after osteochondroplasty using finite element analysis. These postoperative evaluations provide important feedback for future cases, as illustrated in **Figure 1**.
