1. A spinal fixation system, comprising: a bone anchor having a bone-engaging portion and a spinal fixation element receiving portion with opposed arms configured to receive a spinal fixation element therebetween; a connecting member having first and second ends, the first end having an elongate opening extending therethrough; a washer configured to slide along the first end of the connecting member to adjust a distance between the bone anchor and the second end of the connecting member; and a locking mechanism configured to simultaneously lock the washer in a fixed position along the first end of the connecting member, and to lock the first end of the connecting member to the spinal fixation element receiving portion of the bone anchor.
1. A spinal fixation system, comprising: a bone anchor having a bone-engaging portion and a spinal fixation element receiving portion with opposed arms configured to receive a spinal fixation element therebetween; a connecting member having first and second ends, the first end having an elongate opening extending therethrough; a washer configured to slide along the first end of the connecting member to adjust a distance between the bone anchor and the second end of the connecting member; and a locking mechanism configured to simultaneously lock the washer in a fixed position along the first end of the connecting member, and to lock the first end of the connecting member to the spinal fixation element receiving portion of the bone anchor. 9. The system of claim 1 , further comprising a second bone anchor having a bone-engaging portion and a spinal fixation element receiving portion configured to receive a spinal fixation element therein, the second bone anchor being configured to be mated to the second end of the connecting member.