Table 1.

Classification of ARCO [1] stage and treatment method

Stage	Number of cases	MTRO	MTRO with simple bone graft	MTRO with MPBG	Cases with progression
2-A-central	4	3	1
2-B-central	2	2
2-B-lateral	4	2		2
2-C-central	3	1		2
2-C-lateral	4			4	1
3-A-lateral	2	2
3-B-lateral	5	2	1	2	1
3-C-central	1	1
3-C-lateral	18	2	1	15	1

MTRO = modified transtrochanteric rotational osteotomy; MPBG = muscle-pedicle-bone graft.