Exhibit 99.1

Alphatec Holdings, Inc.

Unaudited Pro Forma Condensed Combined Financial Statements

On March 6, 2018, Alphatec Holdings, Inc. (the “Company”) and its newly-created wholly-owned subsidiary, Safari Merger Sub, Inc. (“Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with SafeOp Surgical, Inc., a Delaware corporation (“SafeOp”), certain Key Stockholders of SafeOp and a Stockholder Representative. The Merger Agreement provides for a reverse triangular merger (the “Merger”), which was consummated on March 8, 2018, in which Sub was merged into SafeOp, with SafeOp being the surviving corporation and a wholly-owned subsidiary of the Company. Under the term of the Merger Agreement, the Company paid $15 million in cash, agreed to issue 3,265,132 shares of Common Stock, issued $3 million of notes that are convertible into 931,667 shares of Common Stock (the “Notes”), and issued warrants to purchase 2.2 million shares of Common Stock at an exercise price of $3.50 per share (the “Merger Warrants”). An additional 1,330,263 shares of Common Stock are issuable upon achievement of post-closing milestones.

The following unaudited pro forma condensed combined balance sheet as of December 31, 2017 and the unaudited pro forma condensed combined statements of operations for the year ended December 31, 2017 are based on the historical financial statements of the Company and SafeOp using the acquisition method of accounting.

The unaudited condensed combined pro forma balance sheet as of December 31, 2017 is based on the Company’s consolidated balance sheet as of December 31, 2017 and SafeOp’s balance sheet as of December 31, 2017. The unaudited condensed combined pro forma balance sheet gives effect to the Merger and the completed and anticipated financing as if it had occurred on December 31, 2017, and includes all adjustments that give effect to events that are directly attributable to the Merger and are factually supportable. The unaudited pro forma condensed combined statement of operations for the year ended December 31, 2017 gives effect to the Merger and the completed and anticipated financing as if it had occurred on January 1, 2017 and includes all adjustments that give effect to events that are directly attributable to the Merger and the completed and anticipated financing, are expected to have a continuing impact, and are factually supportable.

The unaudited pro forma condensed combined financial statements are presented for informational purposes only and are not intended to represent or to be indicative of the results of operations and financial position that the Company would have reported had the Merger been completed as of the date set forth in the unaudited pro forma condensed combined financial statements.

The unaudited pro forma condensed combined financial statements reflect certain adjustments based on management’s preliminary estimates of the fair values of tangible and intangible assets acquired. Upon completion of detailed valuation studies the Company may make additional adjustments to the fair values, and these valuations could change significantly from those used to determine certain adjustments in the pro forma condensed combined financial statements.

In addition to the Merger, the pro forma financial statements include the effect of entering into a securities purchase agreement dated March 8, 2018, pursuant to which the Company sold in a private placement (the “Private Placement”) to certain institutional and accredited investors (collectively, the “Purchasers”), including certain directors and executive officers of the Company, at a purchase price of $1,000 per share, 45,200 shares (the “Preferred Shares”) of newly designated Series B Convertible Preferred Stock (the “Series B Convertible Preferred Stock”) (which Preferred Shares will be converted into approximately 14,349,236 shares (subject to adjustment as described below and in the Certificate of Designations) of the Company’s common stock (“Common Stock”) upon approval by the Company’s stockholders (“Stockholder Approval”), and warrants to purchase up to 12,196,851 shares of Common Stock at an exercise price of $3.50 per share (the “Private Offering Warrants”). The Private Offering Warrants will become exercisable following Stockholder Approval, are subject to certain ownership limitations in certain cases, and expire five years after the date of such Stockholder Approval. The aggregate gross proceeds from the Private Placement were $45.2 million. The Company intends to use the net proceeds from the Private Placement for general corporate and working capital purposes and to fund strategic initiatives, including a portion of the Merger consideration described above.

The pro forma financial statements also include the effect of the Company entering into a Warrant Exercise Agreement (the “Exercise Agreement”) with Armistice Capital Master Fund, Ltd. (“Armistice”) on March 8, 2018, a holder of an outstanding warrant to purchase up to an aggregate of 2,400,000 shares of Common Stock, at an exercise price of $2.00 per share (the “Original Warrant”). Pursuant to the terms of the Exercise Agreement, Armistice has agreed to exercise, from time to time and in accordance with the terms of the Original Warrant, including certain beneficial ownership limitations set forth therein, the Original Warrant for cash (the “Warrant Exercise”). As a result of the Warrant Exercise, the Company received gross proceeds of $3.4 million on March 8, 2018 from the exercise of the 1.7 million shares of the Original Warrant, and expects to receive additional gross proceeds of up to $1.4 million thereafter from additional exercises of the remaining shares under the Original Warrant following Stockholder Approval. The Company expects to use the net proceeds from the exercise of the Original Warrant for general corporate and working capital purposes and to fund strategic initiatives.

These unaudited pro forma condensed combined financial statements should be read in conjunction with:

See the accompanying Notes to Unaudited Pro Forma Condensed Combined Financial Statements, which are an integral part of these financial statements.

Alphatec Holdings, Inc.

Notes to Unaudited Pro Forma Condensed Combined Financial Statements

1. Description of Transaction and Basis of Presentation

Description of Transaction

On March 6, 2018, Alphatec Holdings, Inc. (the “Company”) and its newly-created wholly-owned subsidiary, Safari Merger Sub, Inc. (“Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with SafeOp Surgical, Inc., a Delaware corporation (“SafeOp”), certain Key Stockholders of SafeOp and a Stockholder Representative. The Merger Agreement provides for a reverse triangular merger (the “Merger”), which was consummated on March 8, 2018, in which Sub was merged into SafeOp, with SafeOp being the surviving corporation and a wholly-owned subsidiary of the Company. Under the terms of the Merger Agreement, the Company paid $15 million in cash, agreed to issue 3,265,132 shares of Common Stock, issued $3 million of notes that are convertible into 931,667 shares of Common Stock (the “Notes”), and issued warrants to purchase 2.2 million shares of Common Stock at an exercise price of $3.50 per share (the “Merger Warrants”). An additional 1,330,263 shares of Common Stock are issuable upon achievement of post-closing milestones.

In addition to the Merger, the pro forma financial statements include the effect of entering into a securities purchase agreement dated March 8, 2018, pursuant to which the Company sold in a private placement (the “Private Placement”) to certain institutional and accredited investors (collectively, the “Purchasers”), including certain directors and executive officers of the Company, at a purchase price of $1,000 per share, 45,200 shares (the “Preferred Shares”) of newly designated Series B Convertible Preferred Stock (the “Series B Convertible Preferred Stock”) (which Preferred Shares will be converted into approximately 14,349,236 shares (subject to adjustment as described below and in the Certificate of Designations) of the Company’s common stock (“Common Stock”) upon approval by the Company’s stockholders (“Stockholder Approval”), and warrants to purchase up to 12,196,851 shares of Common Stock at an exercise price of $3.50 per share (the “Private Offering Warrants”). The Private Offering Warrants will become exercisable following Stockholder Approval, are subject to certain ownership limitations in certain cases, and expire five years after the date of such Stockholder Approval. The aggregate gross proceeds from the Private Placement were approximately $45.2 million. The Company intends to use the net proceeds from the Private Placement for general corporate and working capital purposes and to fund strategic initiatives, including a portion of the Merger consideration described above.

The pro forma financial statements also include the effect of the Company entering into a Warrant Exercise Agreement (the “Exercise Agreement”) with Armistice Capital Master Fund, Ltd. (“Armistice”) on March 8, 2018, a holder of an outstanding warrant to purchase up to an aggregate of 2,400,000 shares of Common Stock, at an exercise price of $2.00 per share (the “Original Warrant”). Pursuant to the terms of the Exercise Agreement, Armistice has agreed to exercise, from time to time and in accordance with the terms of the Original Warrant, including certain beneficial ownership limitations set forth therein, the Original Warrant for cash (the “Warrant Exercise”). As a result of the Warrant Exercise, the Company received gross proceeds of $3.4 million on March 8, 2018 from the exercise of the 1.7 million shares of the Original Warrant, and expects to receive additional gross proceeds of up to $1.4 million thereafter from additional exercises of the remaining shares under the Original Warrant following Stockholder Approval. The Company expects to use the net proceeds from the exercise of the Original Warrant for general corporate and working capital purposes and to fund strategic initiatives.

Basis of Presentation

The unaudited pro forma condensed combined financial statement have been prepared based on the Company’s and SafeOp’s historical financial information, giving effect to the Merger and related adjustments described in these notes. The Company and SafeOp prepares its financial statement in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). Certain note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted as permitted by the Securities and Exchange Commission rules and regulations.

The unaudited pro forma condensed combined statement of operations for the year ended December 31, 2017, gives effect to the Merger and the completed and anticipated financing as if they were completed on January 1, 2017

and the unaudited pro forma condensed combined balance sheet as of December 31, 2017, gives effect to the Merger and the completed and anticipated financing as if they had occurred on that date.

The historical financial information is adjusted in the unaudited pro forma condensed combined financial information to give effect to pro forma events and are based on (i) the historical consolidated results of operations and financial condition of the Company; (ii) the historical consolidated results of operations and financial condition of SafeOp; and (iii) pro forma events directly attributable to the proposed merger and with respect to the unaudited condensed combined statements of operations are expected to have a continuing impact on the combined results, as further described below.

The Company accounts for business combinations in accordance with Financial Accounting Standards Board Accounting Standards Codification (“ASC”) 805, “Business Combinations.” The purchase price for the Merger has been allocated to the assets and liabilities acquired based on management’s preliminary estimates of the fair values of tangible and intangible assets acquired. Upon completion of detailed valuation studies the Company may make additional adjustments to the fair values, and these valuations could change significantly from those used to determine certain adjustments in the pro forma condensed combined financial statements.

Certain reclassifications have been made to the historical presentation of SafeOp to conform to the presentation used in the unaudited pro forma condensed combined financial information. These reclassifications have no net impact on the historical operating loss, loss from continuing operations, total assets, liabilities, or shareholders’ equity reported by the Company or SafeOp.

2. Purchase Price

In connection with the Merger, the Company agreed to pay $15 million in cash (subject to a working capital adjustment), agreed to issue 3,265,132 shares of Common Stock, issued Notes for $3 million, and issued Merger Warrants to purchase 2.2 million shares of Common Stock at an exercise price of $3.50 per share. In accordance with the terms of the Merger Agreement, the price per share of the Common Stock was based on the per share price at the time of entering into the Letter of Intent and the volume weighted average price per share of the Company’s Common Stock for the period commencing on December 31, 2017 and ending March 5, 2018. For accounting purposes, such shares were valued as of March 12, 2018, the date of issuance, at a per share price of $3.30; a total of $10.8 million. The Merger Warrants were fair valued at $1.6 million using the Black-Scholes valuation model. Additionally, a portion of the consideration transferred was to pay for certain SafeOp transaction costs incurred related to the Merger. As such, payments related to these reimbursements are included in the purchase price below.

The Company agreed to issue additional shares of Common Stock for up to $4.3 million upon achievement of post-closing milestones (the “Contingent Consideration”). The first milestone includes payment of up to $1.4 million 10 days after 501(k) submission of an application for regulatory clearance for an indication for use of a product that includes specifically recording of muscle activity, also known as electromyography (“EMG”). The second milestone includes a payment of up to $2.9 million 10 days after the receipt of 501(k) clearance from any regulatory authority for an indication for use of a product specifically EMG. The Contingent Consideration is recorded as a liability and measured at fair value using a probability-weighted income approach, utilizing significant unobservable inputs including the probability of achieving each of the potential milestones and an estimated discount rate related to the risks of the expected cash flows attributable to the milestones. The material factors that may impact the fair value of the Contingent Consideration, and therefore, this liability, are the probabilities of achieving the related milestones and the discount rate. Significant increases or decreases in any of the probabilities of success would result in a significantly higher or lower fair value, respectively. The fair value of the Contingent Consideration, and the associated liability relating to the Contingent Consideration at each reporting date, will be re-estimated with the changes in fair value reflected in earnings.

The total estimated purchase price is presented below (in thousands):

Pro Forma Adjustments

The cash paid for the Company’s transaction costs includes $1.8 million paid on behalf of SafeOp.

Income Taxes

Due to the Company’s ongoing operating losses, and the resulting inability to recognize any income tax benefit, there is no provision for income taxes in the pro forma condensed combined financial statement.