Sag Sign Test | Rationale & Interpretation

The video tutorial explains the sag sign test, a special test for assessing PCL injuries. It covers the proper positioning of the patient, the importance of supporting the foot without affecting the calf, and how to visually compare both knees to identify tibial sag. The tutorial also discusses the significance of negative and positive results, emphasizing the test's high specificity for diagnosing PCL injuries.

What is the primary advantage of assessing both knees simultaneously during the sag sign test?

• It saves time during the examination.

• It ensures the patient remains comfortable.

• It allows for a visual comparison between the affected and unaffected sides.

• It reduces the need for additional equipment.

Why is it important to support the foot distally during the sag sign test?

• To ensure the knee is fully extended.

• To avoid increasing the likelihood of a false negative.

• To provide comfort to the patient.

• To prevent the patient from moving.

What does a negative posterior sag sign indicate?

• The test was performed incorrectly.

• The PCL is intact and functioning properly.

• A PCL injury is present.

• There is excessive posterior tibial translation.

What does a positive sag sign suggest about the PCL?

• The PCL is not intact, indicating a potential injury.

• The test needs to be repeated.

• There is no posterior tibial translation.

• The PCL is intact.

Why is the posterior sag sign test considered powerful despite its sensitivity?

• It is widely recognized by all medical professionals.

• It can be done without any equipment.

• It has a high specificity, making it excellent for confirming PCL injuries.

• It is easy to perform.