1 Exhibit 11.01 INTERPORE INTERNATIONAL, INC. COMPUTATIONS OF NET INCOME PER SHARE (in thousands, except per share data) (unaudited) Three months ended Six months ended June 30, June 30, ------------------------- ------------------------- 1999 1998 1999 1998 ----------- ----------- ----------- ----------- Net income (loss) used in the calculation of basic earnings per share $ 1,083 $ (4,321) $ 2,165 $ (3,378) Interest on Convertible Subordinated Debentures 67 * 134 * ----------- ----------- ----------- ----------- Net income (loss) used in calculation of diluted earnings per share $ 1,150 $ (4,321) $ 2,299 $ (3,378) =========== =========== =========== =========== Shares used in computing net income (loss) per share - basic: Weighted average common shares outstanding 13,503 13,894 13,497 13,853 Effect of dilutive securities: Weighted average convertible preferred stock 32 * 32 * Shares issuable pursuant to stock option plans 232 * 255 * Shares issuable under the Convertible Subordinated Debentures 495 * 495 * ----------- ----------- ----------- ----------- Shares used in computing net income (loss) per share - diluted 14,262 13,894 14,279 13,853 =========== =========== =========== =========== Net income (loss) per share - basic $ .08 $ (.31) $ .16 $ (.24) Net income (loss) per share - diluted $ .08 $ (.31) $ .16 $ (.24) * Effect of potentially dilutive securities would have been anti-dilutive, accordingly, the amounts are excluded from the calculation of diluted earnings per share. Shares issuable from the convertible subordinated debentures were excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive.