1 EXHIBIT 11.01 INTERPORE INTERNATIONAL, INC. COMPUTATIONS OF NET INCOME PER SHARE (in thousands, except per share data) (unaudited) Three months ended Nine months ended September 30, September 30, ------------------------ ----------------------- 1999 1998 1999 1998 -------- -------- -------- -------- Net income (loss) used in the calculation of basic earnings per share $ 1,394 $ 166 $ 3,559 $ (3,212) Interest on Convertible Subordinated Debentures 66 * 200 * -------- -------- -------- -------- Net income (loss) used in calculation of diluted earnings per share $ 1,460 $ 166 $ 3,759 $ (3,212) ======== ======== ======== ======== Shares used in computing net income (loss) per share basic: Weighted average common shares outstanding 13,512 13,989 13,492 13,898 Effect of dilutive securities: Weighted average convertible preferred stock 32 33 32 * Shares issuable pursuant to stock option plans 434 279 328 * Shares issuable under the Convertible Subordinated Debentures 495 * 495 * -------- -------- -------- -------- Shares used in computing net income (loss) per share - diluted 14,473 14,301 14,347 13,898 ======== ======== ======== ======== Net income (loss) per share - basic $ .10 $ .01 $ .26 $ (.23) Net income (loss) per share - diluted $ .10 $ .01 $ .26 $ (.23) - ------------ * 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 subordianted debentures were excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive.