1. Accuracy in the Measurement of Compartment Pressures: A Comparison of Three Commonly Used Devices by Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am Volume 87(11):2415-2422 November 1, 2005 ©2005 by The Journal of Bone and Joint Surgery, Inc.

2. The test chamber consisted of a large column for saline solution with another clear, graduated column for reading the fluid meniscus. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

3. A, Two views of an 18-gauge straight needle. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

4. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

5. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

6. The Stryker device with the slit catheter demonstrated excellent slope and negligible bias. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

7. The arterial line manometer with the side-port needle demonstrated excellent slope and minimal bias. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

8. The arterial line manometer with the straight needle demonstrated significant positive constant bias (p < 0.001). Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

9. The arterial line manometer with the slit catheter demonstrated minimal bias and excellent slope, with minimal standard error. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

10. The Whitesides apparatus with the side-port needle demonstrated a large amount of scatter. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

11. The Whitesides apparatus with the straight needle demonstrated a large amount of constant and proportional bias as well as a lack of precision. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

12. The Whitesides manometer with the slit catheter also showed large amounts of constant and proportional bias along with scatter. Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.

13. This graph of the predicted measurement levels based on an actual pressure of 40 mm Hg demonstrates the accuracy and precision of each device (see text for descriptions of each device). Antony R. Boody, and Montri D. Wongworawat J Bone Joint Surg Am 2005;87:2415-2422 ©2005 by The Journal of Bone and Joint Surgery, Inc.