TABLE V.

Core Decompression

Study	Level of Evidence	Stage of Disease (no. of hips)		Mean Age (yr)	Mean Follow-up (yr)	Survivorship According to Stage* (%)
		Precollapse	Postcollapse			Precollapse	Postcollapse
Traditional core decompression
Lakshminarayana et al.110 (2019)	III	36	–	30	4.46	75	–
Nazal et al.192 (2019)	IV	11	–	36.4	7	54.5	–
Multiple drilling technique
Yin et al.193 (2016)	III	26	–	41.6	3	58	–
Haberal et al.107 (2018)†	IV	14	16	43.3	2.9	100	87.5
Core decompression with bone-grafting
Lakshminarayana et al.110 (2019)	III	40	–	30	4.5	70	–
Zeng et al.109 (2015)	III	18	–	40.7	4.4	77.8	–
Tantalum rod
Liu et al.194 (2015)	III	26	31	35.4	5	79.3	41.9
Hu et al.195 (2018)	IV	43	29	44.5	2.2	92.9	86.7
Lu et al.196 (2018)	IV	57	–	40.7	4	84.6	–

^*Survivorship defined as no radiographic progression or need for further surgery.

^†Studies that did not describe radiographic outcomes were based only on the need for further surgery.