A spinal rod connector is disclosed that allows end-to-end connection of at least two spinal rods. The connector may allow for angular adjustment in the construct which is associated with the patient's anatomy. Percutaneous length adjustment of the spinal rods may be available with visual assessment of the length of the rods via viewing windows on the connector. A locking mechanism may be used to fix a determined angle of the connector dependent upon the anatomy of the patient. The angle may be adjusted if necessary during a subsequent procedure.