Adjustable, modular instrument and method for spinal manipulation

A spinal manipulation instrument, comprising:

• a driving rod with a threaded portion defining an axis therethrough;
• a first arm rotatably coupled to the driving rod about the axis at a fixed axial location along the driving rod, such that the first arm remains at the fixed axial location during a rotation of the driving rod about the axis;
• a second arm having a threaded collar coupled to the threaded portion of the driving rod, such that the second arm translates along the driving rod with respect to the first arm in response to the rotation of the driving rod about the axis, wherein the second arm includes a double-jointed arm and includes:
• a first arm segment pivotally coupled to the threaded collar and rotatable about a first arm axis parallel to the driving rod axis;
• and
• a second arm segment pivotally coupled to the first arm segment and rotatable about a second arm axis parallel to the driving rod axis;
• a pivot mount between at least one of the first and second arms and the driving rod allowing one of the first and second arms to pivot with respect to the other;
• and
• pedicle connectors configured for releasably coupling each of the first and second arm to a respective bone fastener, the pedicle connectors including a connector tip on each of the first and second arms, a plurality of modular attachment members of different attachment member configurations for interchangeably coupling one of the connector tips to the respective bone fastener, and a swivel allowing rotation of each attachment member about an axis of the respective first or second arm, wherein the swivel is lockable at any of a plurality of different swivel angles within a 360-degree swivel range.