Table 3.

Percentage of bone density changes at three, six, and twelve months postoperatively.

Gruen zones	1 (%)	2 (%)	3 (%)	4 (%)	5 (%)	6 (%)	7 (%)
Three months	−10.05	−12.37	−3.97	−6.90	−2.37	−0.81	−10.05
Six months	−12.69	−13.20	−0.86	−8.30	−3.16	+2.54	−13.87
Twelve months	−8.37	−14.59	+0.82	−6.69	−3.03	−0.41	−11.48