FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

MAVERICK CAPITAL LTD 		2. Issuer Name and Ticker or Trading Symbol

CARDIOVASCULAR SYSTEMS INC [ CSII ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

300 CRESCENT COURT, 18TH FLOOR 		3. Date of Earliest Transaction (MM/DD/YYYY)

2/25/2009
(Street)

DALLAS, TX 75201
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Warrants   $5.71   2/25/2009     J  (2)    803401       2/25/2009   2/24/2014   Common Stock   803401   (3)   (2) 803401   I   See Footnotes   (1) (3)

Explanation of Responses:
( 1)  Maverick Capital, Ltd. ("Maverick Capital") is a registered investment adviser under the Investment Advisers Act of 1940, as amended and acts as the investment manager for each of the portfolio funds that directly hold the reported securities. Maverick Capital Management, LLC ("Maverick") is the general partner of Maverick Capital. Lee S. Ainslie III is the manager of Maverick who is granted sole investment decision pursuant to Maverick's limited liability company regulations. Each reporting owner disclaims beneficial ownership of the reported securities except to the extent of pecuniary interest therein.
( 2)  Pursuant to the merger agreement between Replidyne, Inc., Responder Merger Sub, Inc. and the issuer, dated November 3, 2008, (the "Merger Agreement"), the holders of approximately 68% of the outstanding preferred stock of the issuer entered into an Agreement to Convert and Amendment to the Investor's Rights Agreement, dated November 3, 2008 (the "Conversion Agreement"). In the Conversion Agreement, the holders of the preferred stock of the issuer agreed that, immediately prior to the effective time of the merger (i) they will relinquish certain rights with respect to the preferred stock and (ii) they will convert all shares of preferred stock into shares of common stock of the issuer. The Warrants were issued pro rata to each preferred stockholder, based upon the percentage of preferred stock held, in consideration for their obligations under the Conversion Agreement.
( 3)  Warrants to acquire 353,329 shares of Common Stock are held by Maverick Fund L.D.C.; Warrants to acquire 142,646 shares of Common Stock are held by Maverick Fund USA, Ltd.; and Warrants to acquire 307,426 shares of Common Stock are held by Maverick Fund II, Ltd.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
MAVERICK CAPITAL LTD
300 CRESCENT COURT
18TH FLOOR
DALLAS, TX 75201
X

MAVERICK CAPITAL MANAGEMENT LLC
300 CRESCENT COURT
18TH FLOOR
DALLAS, TX 75201
X

AINSLIE LEE S III
767 FIFTH AVENUE, 11TH FLOOR
NEW YORK, NY 10153
X


Signatures
/s/ John T. McCafferty, Attorney-in-Fact 2/25/2009
** Signature of Reporting Person Date

/s/ John T. McCafferty, Attorney-in-Fact 2/25/2009
** Signature of Reporting Person Date

/s/ John T. McCafferty, Attorney-in-Fact 2/25/2009
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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