Table 3.

Relative BMD loss from baseline 2-years postop (mean ± SEM) per ABG-I/II group

Relative BMD loss 2 years postop (%)
	ABG-I		ABG-I		ABG-II
Gruen zone	Unmatched [19] group A		Matched group B		Reference
	Mean	SEM	Mean	SEM	Mean	SEM
R1	−9.3	2.6	−11.3	3.2	−7.9	2.5
R2	−4.1	2.6	−7.8	3.3	−3.5	2.0
R3	−2.9	1.7	−4.0	2.0	−5.9	2.5
R4	−1.5	1.3	−3.8	1.6	−2.8	1.2
R5	−1.7	2.4	−3.6	1.9	−4.5	1.5
R6	−1.4	2.2	−2.6	2.2	+2.8a	2.8
R7	−11.9	3.3	−14.5	3.0	−4.1	3.7

^aIncreased BMD