DJO Finance LLC
DJO Finance Corporation
1430 Decision Street
Vista, California 92081

We have acted as counsel to DJO Finance LLC, a Delaware limited liability company (the "Company"), and DJO Finance Corporation, a Delaware corporation (the "Co-Issuer" and, together with the Company, the "Issuers"), and to the subsidiaries of the Company listed on Schedule I (the "Guarantors"), in connection with the Registration Statement on Form S-4 (the "Registration Statement"), filed by the Issuers and the Guarantors with the Securities and Exchange Commission (the "Commission") under the Securities Act of 1933, as amended, relating to the issuance by the Issuers of $100,000,000 aggregate principal amount of 10⁷/8% Senior Notes due 2014 (the "Exchange Securities") and the issuance by the Guarantors of guarantees (the "Guarantees") with respect to the Exchange Securities. The Exchange Securities and the Guarantees will be issued under an indenture dated as of November 20, 2007, as supplemented by the First Supplemental Indenture, dated as of January 20, 2010, among the Issuers, the Guarantors and the Trustee (the "Indenture"), among the Issuers, the Guarantors and The Bank of New York Mellon, a New York banking corporation, as trustee (the "Trustee"). The Exchange Securities will be offered by the Issuers in exchange for $100,000,000 aggregate principal amount of their outstanding 10⁷/8% Senior Notes due 2014 that were issued on January 20, 2010.

We have examined the Registration Statement and the Indenture, which has been filed with the Commission as an exhibit to the Registration Statement. We also have examined the originals, or duplicates or certified or conformed copies, of such corporate and other records, agreements, documents and other instruments and have made such other investigations as we have deemed relevant and necessary in connection with the opinions hereinafter set forth. As to questions of fact material to this opinion, we have relied upon certificates or comparable documents of public officials and of officers and representatives of the Issuers and the Guarantors.

In rendering the opinions set forth below, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as duplicates or certified or conformed copies and the authenticity of the originals of such latter documents. We also have assumed that the Indenture is the valid and legally binding obligation of the Trustee.

Based upon the foregoing, and subject to the qualifications, assumptions and limitations stated herein, we are of the opinion that:

Our opinions set forth in paragraphs 1 and 2 above are subject to (i) the effects of bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other similar laws relating to or

affecting creditors' rights generally, (ii) general equitable principles (whether considered in a proceeding in equity or at law) and (iii) an implied covenant of good faith and fair dealing.

Insofar as the opinions expressed herein relate to or are dependent upon matters governed by the law of the State of Minnesota, we have relied upon the opinion of Faegre & Benson LLP dated the date hereof, which is being filed as an exhibit to the Registration Statement. Insofar as the opinions expressed herein relate to or are dependent upon matters governed by the law of the State of Nevada, we have relied upon the opinion of Rice Silbey Reuther & Sullivan, LLP dated the date hereof, which is being filed as an exhibit to the Registration Statement.

We do not express any opinion herein concerning any law other than the law of the State of New York, the federal law of the United States, the Delaware General Corporation Law (including the statutory provisions, all applicable provisions of the Delaware Constitution and reported judicial decisions interpreting the foregoing), the Delaware Limited Liability Company Act, the Delaware Revised Uniform Limited Partnership Act and, to the extent set forth herein, the law of the States of Minnesota and Nevada.

We hereby consent to the filing of this opinion letter as Exhibit 5.1 to the Registration Statement and to the use of our name under the caption "Legal Matters" in the Prospectus included in the Registration Statement.


		Very truly yours,
		/s/ Simpson Thacher & Bartlett LLP
		SIMPSON THACHER & BARTLETT LLP

SUBSIDIARY		STATE OF INCORPORATION OR FORMATION

DJO, LLC		Delaware
Encore Medical, LP		Delaware
Encore Medical Asset Corporation		Nevada
Encore Medical GP, LLC		Nevada
Encore Medical Partners, LLC		Nevada
Empi, Inc.		Minnesota
Empi Corp.		Minnesota