extensor mechanism


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extensor mechanism

The structures that work together to move a joint into an extended position. For most joints, this mechanism is its group of extensor tendons; for other joints, additional structures are involved, such as the patella (a sesamoid bone), which is part of the extensor mechanism of the knee.
See also: mechanism
References in periodicals archive ?
The tumors were adherent and fixed to the underlying extensor mechanism.
Extensor mechanism of knee joint is very much crucial for standing erect and unassisted gait and for this patella plays an important role as lever arm and efficiently augmenting the quadriceps muscle.
Extensor mechanism complications are a frequent problem in revision TKA [31].
In most of the cases, the extensor mechanism was not involved, even after femoral fractures, because at the method of external fixation and intramedullary pin fixation can only do slight damage to 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].
Patella is the largest sesamoid bone and has an important role in function of the knee extensor mechanism. Patellar fractures account for 1% of all skeletal fractures and results from direct, indirect or combined forces.
The extensor mechanism of the knee comprises the quadriceps muscles and tendon, the patella, the patellar ligament and the supporting retinaculum.
A cause of rupture of the central slip of the extensor mechanism. The Journal of Bone and Joint Surgery American volume 52, 1329-1336.
Inability to achieve full active extension (extensor lag) suggests a tear of the extensor mechanism or fracture of the patella.
Briefly, this model uses the following subject specific input variables obtained from standard biomechanical analyses (lower extremity kinematics, net knee joint moment, hamstring and gastrocnemius EMG), and magnetic resonance imaging (lever arm of the extensor mechanism, vasti muscle physiological cross-sectional area proportions, vasti muscle fiber orientation, patellar ligament orientation, and patella flexion angle.
Differences Between Anterior and Structural Knee Pain Anterior Structural Chronic pain in any part of the Resulting from acute traumatic extensor mechanism of the knee.

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