Table 4.

Diagnostic values of MRI readings (reader 1/reader 2) for each grade of cartilaginous lesion in patients with first and recurrent LPDs

		Sensitivity [%]	Specificity [%]	Positive predictive value [%]	Negative predictive value [%]
Grade 4	First LPD	89/83	99/100	94/100	98/97
	Recurrent LPD	70/70	96/95	64/58	97/97
Grade 3	First LPD	83/60	98/98	63/60	99/98
	Recurrent LPD	60/44	97/97	67/57	96/95
Grade 2	First LPD	33/40	97/96	63/55	92/92
	Recurrent LPD	38/50	91/91	40/47	90/92
Grade 1	First LPD	0/0†	98/96	0/0†	98/98
	Recurrent LPD	14/14	98/97	20/11	97/97

† None of the patients with a first LPD had a grade 1 lesion at arthroscopy. Diagnostic values were therefore not ascertainable.