Table 1.

Definition of different clinical classifications that were used in this study to determine the outcome of the adductor tenotomy, closed reduction, and dynamic long leg casting method in infants with developmental dysplasia of the hip diagnosed between the ages of 12 and 18 months.

Classification	Definition	Grade and criteria
Tonnis classification	Radiological grades of dislocation	Type 1: Femoral capital epiphysis medial to Perkin’s line and below Hilgenreiner’s line
		Type 2: Epiphysis below Hilgenreiner’s line but lateral to Perkin’s line
		Type 3: Epiphysis lateral to Perkin’s line at the level of the acetabular margin
		Type 4: Epiphysis lateral to Perkin’s line and above the acetabular rim
McKay’s criteria	Function of hip	Excellent: Painless, stable hip; no limp; more than 15° of internal rotation
		Good: Painless, stable hip; slight limp or decreased motion; negative Trendelenburg’s sign
		Fair: Minimum pain; moderate stiffness; positive Trendelenburg’s sign
		Poor: Significant pain
Severin’s classification	Evaluation of radiographic results	Type I: Normal hips
		Type II: Concentric reduction of the joint with deformity of the femoral neck, head or acetabulum
		Type III: Dysplastic hips without subluxation
		Type IV: Subluxation
		Type V: The head articulating with a secondary acetabulum in the upper part of the original acetabulum
		Type VI: Redislocation
Salter’s criteria	Presentation of avascular necrosis	Yes or No