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 ?
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.
The traditional Thompson quadricepsplasty, which has a history of more than 50 years, is called lysis of the extensor mechanism, but serious surgical trauma has remained.
The knee extensor mechanism is evaluated while the patient is supine or sitting on the edge of the bed.
These are bleeding, wound healing problems, thromboembolic conditions, deep joint infection, loosening, instability, limitation of movement, fractures around the prosthesis, periprostatic fractures, patellar tendon rupture, extensor mechanism injuries, neurovascular injuries, medial collateral ligament injury, inappropriate array, hardness, patellofemoral dislocation, tibiofemoral dislocation, corrosion on the surfaces of prosthesis, osteolysis and tibial insert dislocation [28, 25, 39, 26].
Surgery is indicated when displacement and step-off incongruity of articular fragments are more than 2 and 3 mm, and extensor mechanism is disrupted.
Displaced patellar sleeve avulsion fractures are treated with open reduction and possible internal fixation as well as extensor mechanism reconstruction.
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.
The results of extensor mechanism realignment following failed lateral retinacular releases.
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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