Abstract:
STUDY DESIGN:Measurement of the kinematics of the lumbar spine after insertion of an interspinous spacer in vitro. OBJECTIVES:To understand the kinematics of the instrumented and adjacent levels due to the insertion of this interspinous implant. SUMMARY OF BACKGROUND DATA:An interspinous spacer (X Stop, SFMT, Concord, California) has been developed to treat neurogenic intermittent claudication by placing the stenotic segment in slight flexion and preventing extension. This restriction of motion by the interspinous implant may affect the kinematics of levels adjacent to the instrumented level. METHODS:Seven lumbar spines (L2-L5) were tested in flexion-extension, lateral bending, and axial rotation. Images were taken during each test to determine the kinematics of each motion segment. The interspinous implant was placed at the L3-L4 level, and the test protocol was repeated. RESULTS:The flexion-extension range of motion was significantly reduced at the instrumented level. Axial rotation and lateral bending ranges of motion were not affected at the instrumented level. The range of motion in flexion-extension, axial rotation, and lateral bending at the adjacent segments was not significantly affected by the implant. CONCLUSIONS:The implant does not significantly alter the kinematics of the motion segments adjacent to the instrumented level.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Lindsey DP,Swanson KE,Fuchs P,Hsu KY,Zucherman JF,Yerby SAdoi
10.1097/01.BRS.0000084877.88192.8Ekeywords:
subject
Has Abstractpub_date
2003-10-01 00:00:00pages
2192-7issue
19eissn
0362-2436issn
1528-1159journal_volume
28pub_type
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