Lachman test


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Lach·man test

(lok'man),
a maneuver to detect deficiency of the anterior cruciate ligament; with the knee flexed 20-30°, the tibia is displaced anteriorly relative to the femur; a soft endpoint or greater than 4 mm of displacement is positive (abnormal).

Lachman test

Sports medicine A clinical maneuver used to determine the effects of anterior shear loads applied to the knee at 30º flexion; the LT is preferred to the anterior drawer test for evaluating the integrity of the anterior cruciate ligament. See Anterior drawer test.

Lach·man test

(lak'măn test)
A maneuver to detect deficiency of the anterior cruciate ligament; with the knee flexed 20-30 degrees, the tibia is displaced anteriorly relative to the femur; a soft endpoint of greater than 4 mm displacement is positive (i.e., abnormal).
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LACHMAN TEST: Biomechanics of the Lachman test for anterior cruciate laxity

Lachman test

(lok″măn)
[John Lachman, contemporary U.S. orthopedic surgeon]
A test evaluate the integrity of the anterior cruciate ligament of the knee. The examiner stands on the side being examined and grasps the tibia at the level of the tibial tubercle while stabilizing the femur with the other hand. The patient relaxes the leg while the examiner holds the knee flexed at 25° to 30° and pulls forward on the tibia while stabilizing the femur. Excessive motion relative to the opposite knee or no discernible end point determine a positive result.
See: illustration
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References in periodicals archive ?
The pre-menarche dancers started dance training earlier (p = 0.008), and showed significantly higher prevalence of lateral laxity, patellar laxity, positive Lachman test and positive Drawer test compared with post-menarche dancers (p < 0.05).
Stability tests, Lachman test, and anterior drawer test showed that ACL is intact; thus, there was no need to perform magnetic resonance imaging examination.
In this issue of JFP, Koster and colleagues explain that the Lachman test (and possibly the newer 1 lever sign test) are maneuvers that have a high probability of ruling out complete anterior cru-ciate ligament (ACL) tears when performed properly.
We used Lachman test and anterior drawer test for knee laxity rate.
There was no significant difference in Lachman test before and after surgery for the healthy knee in any study group, nor was there a difference between the healthy knee and injured knee results after ACL reconstruction.
Preoperative examinations, including Anterior drawer test, Lachman test, Pivot-shift test were carried out for all patients.
The stability test of knee (Lachman test, Jerk, Pivot Shift, drawer front) were unremarkable and no signs of meniscal tear or cartilage pathology were found.
All the 20(100%) patients had positive pre-operative Lachman test, anterior drawer test and Slocum test.
At this point, she had a normal knee exam with no effusion, negative Lachman test, negative anterior and posterior drawer tests, and she was stable to varus and valgus stresses.
In addition, patients underwent the instrumented Lachman Test in 25[degree] flexion with the KT-1000 arthrometer (MEDmetric Corp, San Diego, CA).
Lachman test: This test is performed in the same way as the anterior drawer test, but with the knee flexed to 20 degrees.
A drawer test is positive in 50% of patients with ACL tears, and a Lachman test is positive in 95% of cases.