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Table 1 Flounce sign and medial meniscus tear (arthroscopic diagnosis)

From: Validity of flounce sign to rule out medial meniscus tear in knee arthroscopy

Medial meniscus flounce sign

Arthroscopic medial meniscus

Total

 

Normal

Torn

Positive

(TP) 23

(FP) 2

25

Negative

(FN) 11

(TN) 26

37

Total

34

28

62

  1. Sensitivity of Test = TP/TP + FN = 23/34 = 0.6764
  2. Specificity of Test = TN/TN + FP 26/28 = 0.9285
  3. Positive Predictive Value = TP/TP + FP23/25 = 0.9200
  4. Negative predictive value = TN/TN + FN = 26/37 = 0.7027
  5. Accuracy = TP + TN/ALL CASES = 23 + 26/62 = 0.7903