Postoperative arthrofibrosis after primary and revision total knee arthroplasty is a severe complication for the affected patient. Several risk factors have been identified for this diagnosis. We present a series of 3 patients with arthrofibrosis after (revision) total knee arthroplasty. Approximately 2 hours before the operative revision procedure, all patients were irradiated once with 7.01 gray. At latest follow-up, all 3 patients showed a distinct improvement of range of motion. Before revision total knee arthroplasty due to arthrofibrosis, a single dose of pre- or postoperative irradiation should be considered.