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 *

Wyskiel Christina W 		2. Issuer Name and Ticker or Trading Symbol

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

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

C/O MAVERICK CAPITAL LTD, 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)

_ X _ Form filed by One Reporting Person
___ 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
Stock Options   $7.36   2/25/2009     U        23319    11/13/2007   11/12/2017   Common Stock   23319     (3) 0   D   (1)  
Stock Options   $5.11   2/25/2009     U        6681    10/9/2007   10/8/2017   Common Stock   6681     (4) 0   D   (1)  
Stock Options   $5.71   2/25/2009     U        40000      (2) 8/14/2011   Common Stock   40000     (5) 0   D   (1)  

Explanation of Responses:
( 1)  These Stock Options are held by Christina Wyskiel for the benefit of Maverick Fund, L.D.C., Maverick Fund USA, Ltd., and Maverick Fund II, Ltd. Ms. Wyskiel is an employee of an affiliate of Maverick Capital Ltd.
( 2)  These Stock Options are exercisable in three equal annual installments. The first installment became exercisable on August 15, 2007, the second installment became exercisable on August 15, 2008, and the third installment will become exercisable on August 15, 2009.
( 3)  Pursuant to the merger agreement between Replidyne, Inc., Responder Merger Sub, Inc. and the issuer, dated November 3, 2008, (the "Merger Agreement"), these Stock Options were assumed on 02/25/2009 by Replidyne, Inc. and replaced with options to purchase 15,087 shares of Replidyne, Inc. common stock at an exercise price of $11.38 and otherwise having the same terms and conditions as the assumed Stock Options.
( 4)  Pursuant to the Merger Agreement, these Stock Options were assumed on 02/25/2009 by Replidyne, Inc. and replaced with a stock option to purchase 4,322 shares of Replidyne, Inc. common stock at an exercise price of $7.90 and otherwise having the same terms and conditions as the assumed Stock Options.
( 5)  Pursuant to the Merger Agreement, these Stock Options were assumed on 02/25/2009 by Replidyne, Inc. and replaced with a stock option to purchase 25,880 shares of Replidyne, Inc. common stock at an exercise price of $8.83 and otherwise having the same terms and conditions as the assumed Stock Options.

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



Signatures
Christina Wyskiel 2/27/2009
** 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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