Cone-Beam Weight-Bearing Computed Tomography of Ankle Arthritis and Total Ankle Arthroplasty

The 3D visualization approach using weight-bearing cone beam CT technology may allow a more accurate assessment of the hindfoot and midfoot, allowing for a more detailed analysis of the deformity. The WBCT eliminates possible error factors present in the description of 2D representations in conventional radiographs, facilitating the 3D understanding of the foot and ankle anatomical structures. Also, the WBCT has benefited the evaluation of ankle OA as the evaluation of the hindfoot axis, fibula position to the tibia, and the analysis of the joint space are essential for the adequate evaluation of OA of the ankle and planning the treatment. WBCT should be obtained to assess foot and ankle alignment with attention to planus, cavus, varus, or valgus deformities. It is important to emphasize that these deformities must be treated when implantation of the prosthesis or the useful life of the implant may be compromised. A proper alignment is critical to the long-term success and survival of TAR. For this, the WBCT has been used to aid in correcting and assessing potential complications of residual deformities after TAR.