| Summary: | Posttraumatic osteoarthritis (PTOA) of the knee is a common complication after intra- and extra-articular fractures. Moreover, PTOA may also be a result of isolated cartilage defects, meniscus resections, and ligament injuries. There are various methods of treatment of knee joint fractures. However, in the final stage of a PTOA, when nonoperative treatment fails, endoprosthetic joint replacement is the method of choice. Primary total knee replacement (TKR) for the treatment for a fracture of the knee joint is a rare indication, even at major treatment centers. It is performed in elderly patients with the inability to be mobilized with partial- or non-weight bearing; in cases with considerable bone destruction; in cases with symptomatic osteoarthritis (OA) in the elderly; and, it is often associated with the primary use of a modular implant. However, TKR in the acute situation should always be an individual decision. Secondary TKR after knee joint fracture shows overall good functional results. However, the results are inferior when compared with TKR for primary OA. In addition, the complication rates of TKR for PTOA are much higher. Problems with the extensor mechanism after tibial plateau fractures are common. There are also problems caused by preexisting scars, nonunion (possibly due to a low grade infection), malalignment, restricted movement, or instability.
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