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Although no ruptured patellar tendon or dislocation was discovered, previous authors have emphasized the relationship between a high rate of complications and extensor mechanism problems in revision TKA.
Between the femur and extensor mechanism, the articular cavity drainage was prepared.
We theorize that this fracture became incarcerated within the extensor mechanism and lateral retinaculum and that once the soft tissues were released from the fracture site, the patella was easily reduced into anatomic position.
Strokes, occult fracture, rheumatoid arthritis, bilateral effusion, and other medical causes that may contribute to their inability to move their legs and therefore make it difficult to perform an appropriate extensor mechanism examination [18].
As such the semitendinosus and gracilis tendon represent an alternative auto graft donor material that may be used for the reconstruction of ACL without disturbance of the extensor mechanism.
Complications of TKA practices are bleeding, wound problems, thromboembolism, deep joint infection, loosening, instability, limitation of movement, fractures, periprostatic fracture, patellar tendon rupture, injury of extensor mechanism, neurovascular injuries, medial collateral ligament injury, misalignment, stiffness, corrosion on surfaces of prosthesis, osteolysis and tibial insert fracture [28, 47, 25, 26].
En-bloc resection of the tumour was performed with reconstruction of the extensor mechanism by quadriceps turndown.
Chapters explain revision total knee arthroplasty and its basic principles, preoperative planning, exposure, prosthesis selection, periprosthetic knee infections, management of bone loss and extensor mechanism disruption after total knee arthroplasty, and step-by-step instructions for the surgical management of arthroplasty after infection, for periprosthetic fracture, and for instability, with operative photos and images.
Patella is the largest sesamoid bone and has an important role in function of the knee extensor mechanism.
The extensor mechanism of the knee comprises the quadriceps muscles and tendon, the patella, the patellar ligament and the supporting retinaculum.

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