POWER OF ATTORNEY


      Know all by these presents, that the undersigned hereby constitutes and
appoints Kevin Ontiveros, the Chief Legal Officer, Chief Compliance Officer, and
Corporate Secretary of Amedica Corporation (the "Company"), Amy N. Wood,
Corporate Paralegal for the Company, and Daniel Kajunski, Anthony Hubbard,
Kanasha Herbert, Jonathan Ursprung and Caroline Gammill, each of Mintz, Levin,
Cohn, Ferris, Glovsky and Popeo, P.C., signing singly, with full power of
substitution, the undersigned's true and lawful attorney-in-fact to:

      (1)     execute for and on behalf of the undersigned, forms and
              authentication documents for EDGAR Filing Access;

      (2)     do and perform any and all acts for and on behalf of the
              undersigned which may be necessary or desirable to complete and
              execute any such forms and authentication documents;

      (3)     execute for and on behalf of the undersigned, in the undersigned's
              capacity as an officer, director and/or 10% shareholder of the
              Company, Forms 3, 4 and 5 in accordance with Section 16(a) of the
              Securities Exchange Act of 1934 and the rules thereunder;

      (4)     do and perform any and all acts for and on behalf of the
              undersigned which may be necessary or desirable to complete and
              execute any such Form 3, 4 or 5 and timely file such form with the
              United States Securities and Exchange Commission and any stock
              exchange or similar authority; and

      (5)     take any other action of any type whatsoever in connection with
              the foregoing which, in the opinion of such attorney- in - fact,
              may be of benefit to, in the best interest of, or legally required
              by, the undersigned, it being understood that the documents
              executed by such attorney-in-fact, on behalf of the undersigned
              pursuant to this Power of Attorney, shall be in such form and
              shall contain such terms and conditions as such attorney-in-fact
              may approve in such attorney-in-fact's discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

      This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed this 27th day of November, 2013.

                                        /s/ James P. Abraham
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                                        Signature

                                        James P. Abraham
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