Utility of external fixation for traumatic periprosthetic fracture after total ankle arthroplasty in patients with rheumatoid arthritis: A report of two cases.

This report describes two cases of implant-stable traumatic periprosthetic fractures after total ankle arthroplasty in patients with rheumatoid arthritis. One case with a low body mass index (14 kg/m2) achieved complete bone union with the use of an external fixator, while the other case with a high body mass index (32.83 kg/m2) failed to achieve bone union with the external fixator; however, complete union was achieved utilising secondary internal plate fixation. Although open reduction and internal fixation using a plate is the standard procedure in implant-stable periprosthetic fracture cases, fixation using an external fixator might be suitable for patients with rheumatoid arthritis with low body weight and low body mass index, from the perspective of preventing surgical site complications.