TY - RPRT TI - A protocol to evaluate semi-rigid pedicle screw systems. AU - J D Clausen AU - V K Goel AU - K Sairyo AU - M Pfeiffer PY - 1997 DO - 10.1115/1.2796102 UR - https://pubmed.ncbi.nlm.nih.gov/9285351/ ID - 9285351 ER -