Table II.

Clinical data of 20 volunteer patients with sporadic avascular necrosis of the femoral head.

Sporadic members	Age	Sex	Age of onset	Major symptoms	Radiographic findings	Affected hip
1	57	F	42	Groin pain, limping	Cysts, collapse, joint space narrowing, secondary OA	Right
2	64	F	63	Groin pain, limping	Cysts, joint space narrowing, secondary OA	Left
3	67	M	66	Groin pain, limping, restricted motion	Cysts, joint space narrowing, secondary OA	Right
4	51	M	47	Groin pain, limping	Cysts, joint space narrowing, secondary OA	Right
5	66	M	64	Groin pain, limping	Cysts, joint space narrowing, collapse	Bilateral
6	85	M	79	Groin pain, limping	Cysts, joint space narrowing, secondary OA	Left
7	77	M	67	Groin pain, limping	Cysts, collapse, joint space narrowing	Left
8	59	M	55	Groin pain, limping	Cysts, collapse, joint space narrowing	Left
9	62	M	52	Groin pain, limping, restricted motion	Cysts, collapse, joint space narrowing, secondary OA	Left
10	66	F	63	Groin pain, limping	Cysts, subluxation, joint space narrowing	Bilateral
11	63	F	60	Groin pain, limping	Cysts, joint space narrowing, secondary OA	Left
12	64	M	62	Groin pain, limping	Cysts, joint space narrowing	Left
13	75	F	67	Groin pain, limping	Cysts, joint space narrowing	Right
14	47	M	46	Groin pain, limping	Cysts, joint space narrowing, secondary OA	Left
15	64	M	62	Groin pain, limping	Cysts, collapse, joint space narrowing, secondary OA	Left
16	67	F	62	Groin pain, limping	Cysts, collapse, joint space narrowing, secondary OA	Left
17	67	F	61	Groin pain, limping, restricted motion	Cysts, collapse, joint space narrowing, secondary OA	Left
18	71	M	67	Groin pain, limping	Cysts, collapse, joint space narrowing, secondary OA	Left
19	64	M	63	Groin pain, limping, restricted motion	Cysts, collapse, joint space narrowing, secondary OA	Bilateral
20	68	M	62	Groin pain, limping, restricted motion	Cysts, collapse, joint space narrowing, secondary OA	Bilateral

F, female; OA, osteoarthritis; M, male.