Timing of magnetic resonance imaging affects the accuracy and interobserver agreement of anterolateral ligament tears detection in anterior cruciate ligament deficient knees

Table 3 Localization of ALL tears in groups 1 and 2, based on the three portions (femoral, meniscal and tibial tears)

Femoral			Meniscal			Tibial
	MSK radiologist (ALL tears detected), n	MSK radiologist (ALL tears not detected), n		MSK radiologist (ALL tears detected), n	MSK /radiologist (ALL tears not detected), n		MSK radiologist (ALL tears detected), n	MSK radiologist (ALL tears not detected), n
Group 1
Orthopedic surgeon (ALL tears detected), n	30	11	Orthopedic surgeon (ALL tears detected), n	53	10	Orthopedic surgeon (ALL tears detected), n	9	8
Orthopedic surgeon (ALL tears not detected), n	30	17	Orthopedic surgeon (ALL tears not detected), n	14	11	Orthopedic surgeon (ALL tears not detected), n	10	61
Sensitivity	0.5		Sensitivity	0.79		Sensitivity	0.47
Specificity	0.60		Specificity	0.48		Specificity	0.12
PPV	0.73		PPV	0.84		PPV	0.65
NPV	0.36		NPV	0.56		NPV	0.14
Accuracy	0.54		Accuracy	0.73		Accuracy	0.80
Kappa	0.09		Kappa	0.30		Kappa	0.38
Group 2
Orthopedic surgeon (ALL tears detected), n	27	16	Orthopedic surgeon (ALL tears detected), n	26	26	Orthopedic surgeon (ALL tears detected), n	3	25
Orthopedic surgeon (ALL tears not detected), n	11	6	Orthopedic surgeon (ALL tears not detected), n	2	6	Orthopedic surgeon (ALL tears not detected), n	0	32
Sensitivity	0.71		Sensitivity	0.93		Sensitivity	1
Specificity	0.27		Specificity	0.19		Specificity	0.56
PPV	0.63		PPV	0.50		PPV	0.11
NPV	0.35		NPV	0.75		NPV	0
Accuracy	0.55		Accuracy	0.53		Accuracy	0.58
Kappa	−0.02		Kappa	0.11		Kappa	0.12

Group 1 refers to patients who underwent magnetic resonance imaging (MRI) within 1 month of their index injury
Group 2 refers to patients who underwent MRI within 1–2 months of their index injury
ALL anterolateral ligament, MSK musculoskeletal, PPV positive predictive value, NPV negative predictive value

ISSN: 2234-2451