Surgical boot with splined support rod

1. A limb support comprising

a spar configured to be supported from a patient support apparatus and adjustable relative to the patient support, the spar having a longitudinal axis,

a limb rest configured to support the limb of a patient supported on the patient support apparatus, and

a coupler interposed between the limb rest and the spar, the coupler including a single release that is manually selectively actuable to (i) release the limb rest to rotate about a first axis that is offset from the longitudinal axis of the spar to a plurality of orientations relative to the spar, and (ii) release the coupler relative to the spar to allow the coupler to move along the longitudinal axis of the spar,

wherein at least a portion of the coupler engages the spar such that rotation of the coupler about the longitudinal axis of the spar is precluded by the engagement of the portion of the coupler with the spar regardless of the position of the release.

2. The limb support of claim 1 , wherein the portion of the coupler that precludes rotation of the limb support about the longitudinal axis of the spar comprises a clamp with a rotation lock.

3. The limb support of claim 2 , wherein the coupler further comprises a collar that supports the clamp.

4. The limb support of claim 3 , wherein the rotation lock prevents movement of the clamp relative to the collar.

5. The limb support of claim 4 , wherein the rotation lock is releasable to permit rotation of the clamp relative to the collar.

6. The limb support of claim 3 , wherein the rotation lock is adjustable to allow the clamp to be adjusted to a plurality of positions relative to the collar.

7. The limb support of claim 3 , wherein the spar and the collar include a plurality of interengageable anti-rotation elements that cooperate to prevent continuous rotation of the collar about the longitudinal axis of the spar.

8. The limb support of claim 1 , wherein a release mechanism of the coupler is acted upon by the release to permit rotation of the limb rest about a first axis includes an actuator that moves along the first axis when the release is actuated.

9. The limb support of claim 8 , wherein the release mechanism includes a locking plate that is disengaged by the actuator and guides to maintain an orientation of the locking plate such that the locking plate is precluded from rotating about the first axis regardless of the position of the release.

10. The limb support of claim 9 , wherein the locking plate includes anti-rotation features that engage to prevent rotation of the limb rest when the release is not actuated.

11. The limb support of claim 10 , wherein the anti-rotation features are disengaged to thereby allow rotation of the limb rest when the release is actuated.

12. The limb support of claim 1 , wherein actuation of the release causes movement of a first plunger along the first axis which causes movement of a linkage that transfers the motion from the first plunger to a second plunger along a second axis perpendicular to the first axis to cause movement of a release member in a direction parallel' to the movement of the second plunger, allowing the limb support to move along the spar.

13. A coupler for a limb support apparatus comprising

a limb rest support configured to engage a limb rest,

a collar configured to engage an adjustable support arm extending from a patient support apparatus, and

a single release that is manually selectively actuable to (i) release the limb rest support to rotate about a first axis that is offset from the longitudinal axis of the support arm to a plurality of orientations relative to the support arm, and (ii) release the coupler relative to the support arm to allow the coupler to move along the longitudinal axis of support arm,

wherein at least a portion of the coupler is configured to engage the support arm such that rotation of the coupler about the longitudinal axis of the support arm is precluded by the engagement of the portion of the coupler with the support arm regardless of the position of the release.

14. The coupler of claim 13 , wherein the portion of the coupler that precludes rotation of the coupler about the longitudinal axis of the support arm comprises a clamp with a rotation lock.

15. The coupler of claim 14 , wherein the clamp is supported by the collar.

16. The coupler of claim 15 , wherein the rotation lock prevents movement of the clamp relative to the collar.

17. The coupler of claim 13 , wherein the collar includes a plurality of anti-rotation elements that are configured to engage mating elements of the support arm cooperate to prevent continuous rotation of the collar about the longitudinal axis of the support arm.

18. The coupler of claim 13 , wherein a release mechanism of the coupler is acted upon by the release to permit rotation of the limb rest support about a first axis includes an actuator that moves along the first axis when the release is actuated.

19. The coupler of claim 18 , wherein the release mechanism includes a locking plate that is disengaged by the actuator and guides to maintain an orientation of the locking plate such that the locking plate is precluded from rotating about the first axis regardless of the position of the release.

20. The coupler of claim 19 , wherein the locking plate includes anti-rotation features that engage to prevent rotation of the limb rest when the release is not actuated.

21. The coupler of claim 20 , wherein the anti-rotation features are disengaged to thereby allow rotation of the limb rest when the release is actuated.

22. The coupler of claim 13 , wherein actuation of the release causes movement of a first plunger along the first axis which causes movement of a linkage that transfers the motion from the first plunger to a second plunger along a second axis perpendicular to the first axis to cause movement of a release member in a direction parallel' to the movement of the second plunger, allowing the limb rest support to move along the adjustable support arm.