Condylar erosion is predictive of painful closed lock of the temporomandibular joint: a magnetic resonance imaging study

Table 1 Sample characteristics of TMJs with and without a clinical diagnosis of ‘arthralgia coexistant with DDwoR’

MRI Variable	TMJ side with ‘arthralgia and DDwoR’ (n = 62)	TMJ side without ‘TMJ pain and dysfunction’ (n = 62)	Total (n = 124)	P Value
Disk displacement
Disk displacement with reduction (n) (%)	9 (14.5)	23 (37.1)	32 (25.8)	< 0.001^a
Disk displacement without reduction (n) (%)	44 (71.0)	20 (32.3)	64 (51.6)	< 0.001^a
Osteoarthrosis
Subchondral sclerosis (n) (%)	32 (51.6)	31 (50.0)	63 (50.8)	0.857^a
Osteophyte (n) (%)	19 (30.6)	15 (24.2)	34 (27.5)	0.421^a
Condylar Erosion (n) (%)	37 (59.7)	13 (21.0)	50 (40.3)	< 0.001^a
Disk displacement and condylar erosion
Disk displacement with reduction and condylar erosion (n) (%)	2 (3.2)	2 (3.2)	4 (3.2)	1.000^a
Disk displacement without reduction and condylar erosion (n) (%)	35 (56.5)	11 (17.7)	46 (37.1)	< 0.001^a

TMJ: temporomandibular joint, DDwoR: disk displacement without reduction, MRI: magnetic resonance imaging, (%): percent, n: number of TMJs, ^a based on chi-squared test, P: probability of typ I error

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