Table 2.

Indications for the Chiari procedure and negative survival predictors as suggested by the authors

Reference Inclusion criteria	Significant negative survival factors
Calvert et al. (15)  Congenital hip dislocation Acetabular dysplasia	None reported
Kotz et al. (22)  High-grade dysplasia without signs of OA	Age at the time of operation
Migaud et al. (17)  Acetabular dysplasia Preoperative stage of OA and CEA > 0°	Age before operation
Nakano et al. (18)  OA secondary to congenital subluxation or acetabular dysplasia	Reduced volume of the interposed soft tissues: capsule and the remaining labrum. Presence of labrum interposed between the new acetabular roof and the femoral head
Nakata et al. (16)  Pain and disability attributable to OA	Preoperative stage of OA
Ohashi et al. (20)  Subluxation of the hip and OA	None reported
Rozkydal et al. (21)  DDH	Level of osteotomy (high or low). Severe deformity of femoral head
Yanagimoto et al. (19)  DDH	Advanced DDH. Spherical femoral head

CEA = center–edge angle, DDH = developmental dysplasia of the hip, OA = osteoarthritis.