Ankle pain following total knee arthroplasty. A case report

The authors present their experience with four cases of ankle pain occurring in the immediate postoperative period after total knee arthroplasty. In a 40-month period, the authors performed 87 total knee arthroplasties. In the first 28 cases, an extramedullary alignment rod was used and there were no instances of ankle pain (0%). In the next 30 cases, an intramedullary alignment rod was employed and there were three cases of moderate to severe ankle pain (10%). In the last 29 cases, the medullary canal was decompressed, irrigated, and aspirated prior to insertion of the alignment rod. In this group there was only one case of mild ankle discomfort (3.5%). An extensive investigation was made into one of the cases in which the intramedullary alignment rod was used but the canal was not aspirated. Information from this case investigation, observation of the three subsequent cases, and the notation of a decrease in the incidence of ankle pain once aspiration was routinely used are reported. The unproven hypothesis that ankle pain may result from compression of the marrow contents into the bone interstices is presented for consideration. Three of the four cases of ankle pain reported here were spontaneously resolved within 9 months after surgery.