Table 1.

			First episode				Second episode				Third episode
	Gender	Diagnosis	Age	Location	Instrumentation		Age	Location	Instrumentation		Age	Location	Treatment
case 1	M	DISH (C2-L4) *	83	C5-C6	C3-T2		88	L1	T11-L3		89	L1	Brace
case 2	F	AS (C7-L2)	76	T8	T6-T10		82	L1	T11-L3
Reference	M	AS (C2-L4)	81	T11-T12	T8-L2		83	C6-C7, L2-L3	C3-T3, T8-L5

*Parenthesis indicates area of ankylosed spine