Tools

Add a finding for this diagnosis

Add prevalence for this diagnosis

Switch to display mode

Switch to likelihood ratios

Sort findings by Tag

Sort findings by Differential Diagnosis

Jump To

Sensitive and Specific Findings

Specific Findings

Anterior Cruciate Ligament Tear: Sensitivity and Specificity

Introduction: None written.

[Edit Diagnosis] [Merge dx] [Add prevalence]

Tags: Musculoskeletal Tag this Diagnosis.

The sensitivity and specificity of findings for Anterior Cruciate Ligament Tear are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Sensitive and Specific Findings
Finding	Result	Sensitivity	Specificity
[ + ] Lachman Test	+ 0 -	87%	93%
pull anteriorly when knee is flexed at 30 degrees Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229
[ + ] MRI	+ 0 -	87%	91%
Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229 Systematic review. Radiology 2003 PMID: 12601211

Specific Findings
Finding	Result	Sensitivity	Specificity
[ + ] Pivot Test	+ 0 -	61%	97%
Fully extend the knee, rotate the foot internally. Apply a valgus stress while progressively flexing the knee, watching and feeling for translation of the tibia on the femur. Study: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229
[ + ] Anterior drawer test as measured by the KT-1000 arthrometer	+ 0 -	77%	90%
The sensitivity and specificity will vary based on the amount of force applied and the threshold chosen for anterior tibial motion. These numbers above are for a 30 lbs test with >3mm as diagnostic threshold for ACL tear. Study: PMID 19398799
[ + ] Anterior Drawer Test	+ 0 -	48%	87%
pull anteriorly when the knee is flexed at 90 degrees Note that when the anterior drawer test has been studied using the KT-1000 arthrometer. This provides an objective measure to the anterior drawer test. When performed with the KT-1000 arthrometer, the sensitivity and specificity will vary based on the amount of force applied and the threshold chosen for anterior tibial motion. For a 30 lbs test with >3mm as diagnostic threshold for ACL tear the sensitivity and specificity have been reported as 77% and 90%. The anterior drawer test has been studied with objective measurements using ultrasonography. The sensitivity and specificity were reported as 96% and 98% though the cut off displacement distance appears to have been decided upon after the data was examied. See PMID 10401653 Study: Anterior drawer test: Ann Intern Med. 2003 Oct 7;139(7):575-88. PMID: 14530229 KT-1000 Arthrometer: PMID 19398799 Ultrasound: PMID 10401653