Pivoted tensiometer for measuring tension in an intervertebral disc space

摘要

Pivoted tensiometers (51) adapted for use in measuring tension in an intervertebral disc space and method of use are described. The tensiometer (51) includes a first longitudinal member (53) having a distal end portion (55) adapted for engaging a first vertebral surface, an intermediate portion (151), and a proximal handle portion (57) having an attachment point (117). A second longitudinal member (63) having a distal end portion (65) adapted for engaging a second vertebral surface, an intermediate portion (161), and a proximal handle portion (67) having an attachment point (119), the first and second longitudinal members being pivotally attached at a first pivot junction (71) between the proximal handle and intermediate portions of each longitudinal member is also included. A load cell (81) is attached to each of the attachment points (117,119) and is adapted to report a load corresponding to a change in distance between the attachment points.