Jose Barbera

Lumbosacral fixation using expandable pedicle screws. an alternative in reoperation and osteoporosis.

S. Cook, T. Whitecloud, S. Salkeld, 2001, The spine journal.

Biomechanical evaluation and preliminary clinical experience with an expansive pedicle screw design.

S. Cook, T. Whitecloud, S. Salkeld, 2000, Journal of spinal disorders.