A spinal treatment system for applying a preselected force regimen to a spine of a patient includes a treatment bed, having a head end and a foot end, is configured to support the patient. A harness is configured to transmit force to a portion of the spine of the patient. A cable having a first end is coupled to the harness and is configured to apply force to the harness. A matrix head is coupled to the cable and is configured to apply a force, having a force magnitude and a force direction, to the cable, so that the force direction varies along more than one axis. A vertical displacement drive is disposed adjacent to the foot end of the treatment bed and is configured to support the matrix head and to displace the matrix head along a vertical axis. A computer is programmed to drive the vertical displacement drive and the matrix head.