Biomechanics and Tribology of Total Ankle Replacement

Indications, Functional Outcomes, Return to Sport and Complications of Anterior and Lateral Approaches for Total Ankle Arthroplasty: A Comprehensive Review

Ankle osteoarthritis (OA) is a degenerative condition that impacts quality of life. Total ankle replacement (TAR) represents a significant advancement in orthopedic surgery. Objectives: The purpose was to provide an overview of the indications, outcomes, and complications of anterior and lateral surgical approaches in TAR, as well as return to sport following surgery. Methods: The PubMed, MEDLINE, Scopus, and Cochrane Central databases were searched. The keywords used were "total ankle arthroplasty", "total ankle replacement", "ankle anterior approach", "ankle lateral approach", "outcomes", "return to sport", and "complications", and the search included articles published from 2014 to 2024. Results: Successful functional outcomes, return to athletic activity, and return to the previous level of sports performance after surgery have been reported at rates of over 60%. The anterior approach restores the normal tibial slope but presents a high risk of wound-healing complications and medial malleolar fractures. The lateral approach allows an anatomic placement of the implant, but it is associated with fibular complications and a high risk of revision surgery. Return to sport is feasible in low-impact sports such as cycling, swimming, and dancing. Conclusions: The anterior and lateral approaches for TAR yielded satisfactory functional outcomes and rates of return to athletic activity. Different intra- and post-operative complications and revision surgery should be managed properly to optimize outcomes.

Current Trends in Total Ankle Replacement

Ankle arthritis can result in significant pain and restriction in range of motion. Total ankle replacement (TAR) is a motion-preserving surgical option used as an alternative to total ankle arthrodesis to treat end-stage ankle arthritis. There are several generations of TAR techniques based on component design, implant material, and surgical technique. With more recent TAR implants, an attempt is made to minimize bone resection and mirror the native anatomy. There are more than 20 implant devices currently available. Implant survivorship varies among prosthesis types and generations, with improved outcomes reported with use of the more recent third- and fourth-generation ankle implants. Pre- and postoperative assessments of TAR are primarily performed by using weight-bearing radiography, with weight-bearing CT emerging as an additional imaging tool. Preoperative assessments include those of the tibiotalar angle, offset, and adjacent areas of arthritis requiring additional surgical procedures. US, nuclear medicine studies, and MRI can be used to troubleshoot complications. Effective radiologic assessment requires an understanding of the component design and corresponding normal perioperative imaging features of ankle implants, as well as recognition of common and device-specific complications. General complications seen at radiography include aseptic loosening, osteolysis, hardware subsidence, periprosthetic fracture, infection, gutter impingement, heterotopic ossification, and syndesmotic nonunion. The authors review several recent generations of TAR implants commonly used in the United States, normal pre- and postoperative imaging assessment, and imaging complications of TAR. Indications for advanced imaging of TAR are also reviewed. ©RSNA, 2023 Supplemental material is available for this article. Test Your Knowledge questions for this article are available through the Online Learning Center.