EXHIBIT 10.8

THIS CONVERTIBLE SUBORDINATED PROMISSORY NOTE HAS NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") OR THE
SECURITIES, BLUE SKY OR OTHER APPLICABLE LAWS OF ANY STATE, OR ANY OTHER
RELEVANT JURISDICTION, AND MAY NOT BE OFFERED, SOLD OR OTHERWISE
TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS IT IS (A) REGISTERED AND/OR
QUALIFIED PURSUANT TO THE RELEVANT PROVISIONS OF U.S. FEDERAL SECURITIES
LAWS, THE SECURITIES, BLUE SKY, OR OTHER APPLICABLE LAWS OF ANY STATE, OR
OTHER RELEVANT JURISDICTION OR (B) EXEMPT FROM SUCH REGISTRATION OR
QUALIFICATION.  THEREFORE, NO SALE, PLEDGE OR OTHER TRANSFER OF THIS
SECURITY SHALL BE MADE, NO ATTEMPTED SALE, PLEDGE OR OTHER TRANSFER SHALL
BE VALID, AND THE ISSUER SHALL NOT BE REQUIRED TO GIVE ANY EFFECT TO ANY
SUCH TRANSACTION UNLESS (A) SUCH TRANSACTION SHALL HAVE BEEN DULY
REGISTERED UNDER THE SECURITIES ACT AND QUALIFIED OR APPROVED UNDER THE
SECURITIES, BLUE SKY, OR OTHER APPLICABLE LAWS OF ANY STATE, OR OTHER
RELEVANT JURISDICTION, OR (B) THE OBLIGOR SHALL HAVE BEEN SATISFIED THAT
SUCH REGISTRATION, QUALIFICATION OR APPROVAL IS NOT REQUIRED.

                  CONVERTIBLE SUBORDINATED PROMISSORY NOTE
                  ----------------------------------------

$1,200,000 - Principal Amount                  Issue Date - December 2, 2003

     FOR VALUE RECEIVED, Crdentia Corp., a Delaware corporation ("Obligor"),
hereby promises to pay to the order of Robin Riddle or her assigns
("Holder"), in lawful money of the United States at the address of Holder
set forth below, the principal sum of One Million Two Hundred Thousand
Dollars ($1,200,000), together with interest thereon as provided in this
Promissory Note (the "Note") on the unpaid principal balance.  Interest
shall accrue at a rate of twelve percent (12%) per annum, simple interest,
until paid in full.

     Subject to the conversion provisions set forth herein, unpaid principal
under this Note together with all accrued and unpaid interest shall be paid
to Holder as follows:  Beginning on December 2, 2003 and continuing through
November 1, 2006, Obligor shall make a total of thirty-six (36) equal,
consecutive monthly payments to Holder each in the amount of Thirty-Nine
Thousand Eight Hundred Fifty-Seven and 81/100 Dollars ($39,857.81)
consisting of principal and interest amortized from the period beginning
October 31, 2003, which such payments shall be made within ten (10) business
days of the first date of such month.  Notwithstanding the foregoing, this
Note may be prepaid, in whole or in part, at any time without premium or
penalty.

     The outstanding principal balance (plus accrued and unpaid interest on
the date thereon) on this Note shall be converted at Holder's option and in
Holder's sole discretion into shares of Obligor's Common Stock (the "Common
Stock") upon delivery of written notice by Holder to Obligor.  The number of
shares of Common Stock shall be equal to the quotient obtained by dividing
(a) the aggregate outstanding principal due, plus accrued and unpaid
interest on this Note on the date of conversion by (b) the Conversion Price.
For purposes of this Note, the "Conversion Price" shall mean the closing
price of the Common Stock as reported on the

<PAGE>

National Association of Securities Dealers, Inc. Over the Counter Bulletin
Board (the "OTCBB") or other national stock exchange on the date of such
conversion.  Notwithstanding the foregoing, in the event that Obligor's
Common Stock is not traded on the OTCBB or other national stock exchange on
the date of such conversion, the "Conversion Price" shall be the fair market
value of Obligor's Common Stock as determined in good faith by Obligor's
board of directors, which Conversion Price so determined shall be delivered
in writing to Holder, who shall have 10 business days after receipt thereof
to withdraw the notice of conversion.  In the event of any such withdrawal,
the notice of conversion shall be void ab initio.

     No fractional shares will be issued upon conversion of this Note.  In
lieu of any fractional share to which Holder would otherwise be entitled,
Obligor will pay to Holder in cash that amount of the unconverted principal
and interest balance of this Note. Upon conversion of this Note into such
equity securities, Holder shall surrender this Note, duly endorsed, at the
principal offices of Obligor or any transfer agent for Obligor.  At its
expense, Obligor will, as soon as practicable thereafter, issue and
deliver to Holder a certificate for the number of shares of equity
securities to which Holder is entitled upon such conversion, together with
any other securities and property to which Holder is entitled upon such
conversion under the terms of this Note, including a check payable to
Holder for any cash amounts payable as described above.  Upon conversion of
this Note into such equity securities, Obligor will be forever released
from all its obligations and liabilities under this Note, including without
limitation the obligation to pay the principal and interest amounts.

     If any payment of principal or interest on this Note shall become due
on a Saturday, Sunday, or a public holiday under the laws of the State of
California, such payment shall be made on the next succeeding business day.

     The indebtedness evidenced by this Note is hereby expressly
subordinated, to the extent and in the manner hereinafter set forth, in
right of payment to the prior payment in full of all Obligor's Senior Debt.
For purposes of this Note, "Senior Debt" shall mean, except as otherwise
provided herein: (a) any indebtedness of Obligor (plus interest, premium and
penalties due from or arising out of such indebtedness, or any refinancing
thereof): (i) for borrowed funds; (ii) due to the sellers or lessors of any
real or personal property to Obligor; or (iii) for reimbursement obligations
with respect to letters of credit; (b) any other indebtedness of Obligor,
except to the extent that the holder of such indebtedness otherwise agrees
in writing; and (c) any debentures, notes or other evidences of indebtedness
issued in exchange for any of the foregoing indebtedness, or any
indebtedness arising from the satisfaction of such indebtedness by a
guarantor.  Notwithstanding anything herein to the contrary, Senior Debt
shall not include any indebtedness of Obligor (or of any subsidiary of
Obligor ) incurred as seller financing in connection with acquisitions of
temporary nurses staffing companies or travel nurse companies consummated
prior to or following the date hereof.  Notwithstanding anything herein to
the contrary, no payment of principal or interest shall be made on this
Note if, but only as long as, there exists any default, or the existence of
any event which, with the giving of notice, would constitute a default, in
the payment of Senior Debt, as determined by the terms of any such Senior
Debt. Holder shall execute, at or following the date hereof, as the case may
be, all subordination documents required by the holders of Senior Debt
necessary to effectuate the terms of the foregoing.


<PAGE>

     In the event that Obligor (a) fails to make payment on any date for
payment herein above specified of any principal and/or interest due
hereunder on such date, (b) admits in writing its inability to pay its
debts as they become due, or makes a general assignment for the benefit of
creditors or files any petition or action for relief under any bankruptcy,
reorganization, insolvency or moratorium law, or any other law or laws for
the relief of, or relating to, debtors or (c) an involuntary petition is
filed against Obligor under any bankruptcy, reorganization, insolvency or
moratorium law, or any other law or laws for the relief of, or relating to,
debtors unless such petition shall be dismissed or vacated within sixty (60)
days of the date thereof, Obligor shall be deemed to be in default
hereunder.  In the event of such default, Holder may, at Holder's option and
in Holder's sole discretion, ten (10) business days after giving notice of
default to Obligor, accelerate the maturity of all amounts due under this
Note by giving notice of such acceleration.

     The acceptance by Holder of any payment hereunder which is less than
the payment in full of all amounts due and payable at the time of such
payment shall not constitute a waiver of the right to accelerate at that
time or any subsequent time or nullify any prior acceleration without the
express consent of Holder except as and to the extent otherwise provided by
law.

     Obligor waives presentment, demand for performance, notice of
nonperformance, protest, notice of protest, and notice of dishonor (but not
notice of default).  No delay on the part of Holder in exercising any right
hereunder shall operate as a waiver of such right under this Note.  This
Note is being delivered in and shall be construed in accordance with the
laws of the State of California as applied to contracts entered into by
California residents within the State of California, which contracts are to
be performed entirely within the State of California.

     The right to plead any and all statutes of limitations as a defense to
any demand on this Note, or any guaranty hereof, or any agreement to the
same, or any instrument securing this Note, or any and all obligations or
liabilities arising out of or in connection with this Note, is expressly
waived by Obligor and each and every endorser or guarantor if any, to the
fullest extent permitted by law.

     Notwithstanding anything to the contrary contained herein, the total
liability for payments hereunder in the nature of interest shall not exceed
the limits imposed by applicable interest rate limitation laws.

     The provisions of this Note are intended by Obligor to be severable and
divisible and the invalidity or unenforceability of a provision or term
herein shall not invalidate or render unenforceable the remainder of this
Note or any part thereof.

     If the indebtedness represented by this Note or any part thereof is
collected at law or in equity or in bankruptcy, receivership or other
judicial proceedings or if this Note is placed in the hands of attorneys
for collection after default, Obligor agrees to pay, in addition to the
principal and interest payable hereon, reasonable attorneys' fees and costs
incurred by Holder.

     Any notice or other communication (except payment) required or
permitted hereunder shall be in writing and shall be deemed to have been
given upon delivery if personally delivered

<PAGE>

or one day after deposit if deposited in the United States mail for mailing
by certified mail, postage prepaid, and addressed as follows:

     If to Holder:     Rison Management Services, L.P.
                       14114 Dallas Parkway, Suite 220
                       Dallas, Texas  75240
                       Attention:  Robin D. Riddle

     If to Obligor:    Crdentia Corp.
                       455 Market Street, Suite 1220
                       San Francisco, California  94105
                       Attention: James D. Durham

     with a copy to:   Steven G. Rowles, Esq.
                       Morrison & Foerster LLP
                       3811 Valley Centre Drive, Suite 500
                       San Diego, California  92130

Any payment shall be deemed made upon receipt by Holder.  Each of Holder or
Obligor may change her or its address for purposes of this paragraph by
giving to the other party notice in conformance with this paragraph of such
new address.

     This Note is a renewal, extension and restatement of that certain
Amended and Restated Line of Credit Promissory Note executed by PSR Nurses,
Ltd. (the "Partnership") in favor of Holder on April 1, 2003 (the "Prior
Note").  Upon Holder's acceptance of this Note, the Prior Note shall be
concurrently surrendered to Obligor for cancellation and neither Obligor,
the Partnership nor Holder shall have any continuing rights or obligations
thereunder.  In addition, upon acceptance of this Note, Holder agrees to
release certain security interests she may have with respect to certain
assets of the Partnership pursuant to that certain Amended Third Lien
Security Agreement dated April 1, 2003 and authorizes the filing of any
necessary filings and releases to effect the intent of the foregoing.

OBLIGOR:	                       CRDENTIA CORP.,
                                       a Delaware corporation
                                       By:  /s/ James D. Durham
                                       Name:  James D. Durham
                                       Title:  Chief Executive Officer


HOLDER:	                               ROBIN D. RIDDLE
	                               /s/ Robin D. Riddle
	                               Robin D. Riddle

