The invention relates to a connection adapter between a rigid transcutaneous implant, which can be anchored intracorporeally in a femoral stump, and a part of an extracoporeal orthopaedic knee joint, said connection adapter comprising a first coupling part (1) for connection to the transcutaneous implant and a second coupling part (2) for connection to the knee joint, wherein the second coupling part (2) can be connected releasably to the first coupling part (1), wherein a safety coupling (3) is arranged in the interior of the second coupling part (2) and transfers a torsional moment between the first coupling part (1) and the second coupling part (2) and slips through when an adjustable maximum value of the torsional moment is exceeded.
