Surgical systems, kits and methods for setting bone segments
An intramedullary nail system is provided with at least one resilient, elongate nail body configured to extend axially along a medullary bone cavity, and at least one bone anchor. The bone anchor includes a distal bone engagement portion configured to secure the anchor to a bone, a proximal nail engagement portion configured to receive a portion of the nail body therethrough, and a tightening mechanism configured to move from a movable state in which the nail body may slide axially and rotate through the engagement portion and a fixed state in which the nail body is prevented from moving relative to the engagement portion. Methods of use and surgical kits are also provided.
1. A method of intramedullary bone fixation comprising:
installing a bone anchor in a side surface of a bone, the bone anchor having a head;
sliding a distal end of a resilient, elongate nail body longitudinally into the bone through a channel in the head of the installed bone anchor and along a medullary cavity of the bone to occupy a portion of the cavity such that the nail body enters the anchor channel through the side surface of the bone adjacent to the anchor head; and
tightening a mechanism on the bone anchor such that the mechanism moves from a movable state in which the nail body may slide axially and rotate through the engagement portion and a fixed state in which the nail body is prevented from moving relative to the bone anchor,
wherein the resilient, elongate nail body includes a curved portion that exerts a lateral spring force against a wall of the medullary cavity after the nail body is implanted.
2. The method of claim 1 , further comprising creating a countersink cavity in the bone prior to installing the bone anchor in the bone.
3. The method of claim 2 , wherein the countersink cavity is sized and shaped to receive the bone anchor therein.
4. The method of claim 1 , wherein the installed bone anchor protrudes from an outer surface of the bone 0 to 2 mm so as to obviate overlying soft tissue irritation.
5. The method of claim 1 , further comprising removing an excess length from a protruding end of the nail body after the nail body has been installed in the bone.
6. The method of claim 5 , wherein nail body is slid into a final position and the bone anchor mechanism is tightened after the excess length is removed from the nail body.
7. The method of claim 1 , wherein the installed nail body protrudes from an outer surface of the bone 2 to 3 mm so as to obviate overlying soft tissue irritation.
8. The method of claim 1 , further comprising performing the installing, sliding and tightening steps on a plurality of bone anchors and nail bodies installed into the same bone.
9. The method of claim 1 , wherein the nail body comprises a diameter of no more than 5 mm.
10. The method of claim 1 , wherein the nail body occupies only a portion of a transverse cross section of the medullary cavity of the bone.
11. The method of claim 1 , wherein neither the bone anchor nor the nail body impinges on a growth plate of the bone.
12. The method of claim 1 , wherein only a single bone anchor is attached to the nail body.
13. The method of claim 1 , wherein each of the steps are repeated in order to implant a second bone anchor and a second nail body.
14. The method of claim 13 , wherein only a single bone anchor is installed for each of the nail bodies.
15. The method of claim 1 , wherein the bone anchor is installed in the bone at a non-perpendicular angle to a longitudinal axis of the bone.