SPINE-TECH, INC. EXHIBIT 11---STATEMENT RE: COMPUTATION OF INCOME (LOSS) PER SHARE (Unaudited) Three Months Ended Six Months Ended June 30, June 30, ---------------------------- -------------------------- 1997 1996 1997 1996 ------------- ------------ ------------ ---------- PRIMARY INCOME (LOSS) PER SHARE: Weighted average shares outstanding 10,091,531 9,824,959 10,051,533 9,765,828 Net effect of dilutive stock options -- based on the treasury stock method 1,649,252 -- 1,594,973 -- ------------- ------------ ------------ ---------- 11,740,783 9,824,959 11,646,506 9,765,828 ------------- ------------ ------------ ---------- ------------- ------------ ------------ ---------- Net income (loss) $ 2,949,818 $ (585,457) $ 4,139,315 $ (940,461) ------------- ------------ ------------ ---------- ------------- ------------ ------------ ---------- Primary income (loss) per share $ 0.25 $ (0.06) $ 0.35 $ (0.10) ------------- ------------ ------------ ---------- ------------- ------------ ------------ ---------- FULLY DILUTED INCOME (LOSS) PER SHARE: Weighted average shares outstanding 10,091,531 9,824,959 10,051,533 9,765,828 Net effect of dilutive stock options -- based on the treasury stock method 1,603,075 -- 1,603,075 -- ------------- ------------ ------------ ---------- 11,694,606 9,824,959 11,654,608 9,765,828 ------------- ------------ ------------ ---------- ------------- ------------ ------------ ---------- ------------- ------------ ------------ ---------- Net income (loss) $ 2,949,818 $ (585,457) $ 4,139,315 $ (940,461) ------------- ------------ ------------ ---------- ------------- ------------ ------------ ---------- Fully diluted income (loss) per share $ 0.25 $ (0.06) $ 0.35 $ (0.10) ------------- ------------ ------------ ---------- ------------- ------------ ------------ ----------