**7. Conclusion**

*Essentials in Hip and Ankle*

**Figure 7.**

**Figure 8.**

**58**

**5. Postoperative evaluation**

*lesion. The center of the cross indicates the tip of the abrader burr.*

revision FAI surgery [5].

Postoperative evaluation is also possible and provides useful clinical feedback. Improvement in the maximum internal rotation angle indicates a release from the bony impingement. Ross et al. also adopted computer simulation analysis to evaluate the three-dimensional morphology of hips with residual symptoms prior to

*Navigation assistance for pincer resection. The purple colored area shows the planned resection for a pincer* 

*Verification of resected area and depth using a pointer device. The pointer device indicates the distal margin of the resected area from the anterolateral portal view with the pointer via the mid-anterior portal (A), which is also identified by the computer navigation monitor (B). The lateral margin of the resected area is clearly* 

*verified from the mid-anterior portal view with the pointer via the anterolateral portal (C, D).*

Another application of postoperative evaluation after osteochondroplasty is the assessment of mechanical bone strength by finite element analysis. This approach was used by Oba et al. to calculate changes in simulated fracture load between pre- and postoperative femur models in a clinical study of postoperative

A summary of the preoperative assessment, planning, and navigation for arthroscopic FAI surgery using computer-assisted technology is presented. Each step of computer-assisted technology is mutually related, and it is important to comprehend this technology as a sequential flow. Although there are several limitations that need to be addressed, the notable benefits can contribute to the successful treatment of FAI.
