Wedge Osteometry BoneTractor

Designed to facilitate accurate execution of corrective wedge osteotomies of long bones


Available for Licensing

IP Status

US Patent Pending: US 2020/0113581 A1


Felix Duerr

Quick Overview

The BoneTractor device is designed to facilitate standard osteotomies and partial/modified closing wedge osteotomies. The device is inserted into the osteotomy, adjusted to the desired wedge size and secured, allowing the surgical saw to be precisely guided during the procedure – because an osteotomy requires precision.

Generally, templates or protractors are used to guide the osteotomy intra-operatively after extensive planning and calculations; nevertheless, resulting in large deviations and unintended complications.  The BoneTractor improves accuracy and outcome while shortening surgical planning and operation time.

Wedge osteotomies are commonly performed for the treatment of osseous deformities. In people, an osteotomy can correct deformities, realign arthritic joints, and correct hip dysplasia.  In veterinary medicine, it is frequently performed to address ruptured knee ligaments and stabilize the kneecap of the stifle joint (the hind joint of an animal).


Licensing Director

Steve Foster

Reference No.: 17-097

Comparing the Technology

Current Method:  According to the Journal of Bone and Joint Surgery, “conventional methods for determining the correction angle and wedge size include pre-operative radiological measurement and planning, intra-operative measurement with the help of a cable, grids with lead-impregnated reference lines, and a system that uses a jig.”

The Device:  Following pre-operative measurements and planning, a surgeon would first complete a simple transverse osteotomy, followed by insertion of the BoneTractor into the osteotomy.  The osteotomy is then manually compressed, adjusted to the optimal wedge size, and secured.  The second osteotomy is then performed simply following the saw guide.  Thusly, eliminating the use of cables and grids.

  • Well aligned with current methods for treatment, and simple to use
  • Considerably less expensive than robotic surgical methods being developed (which are more difficult to implement)
  • Dynamic angle analysis and the position of the osteotomy plane, as well as the size of the patient are easily accounted for
  • Available in several sizes to accommodate any size bone, dog, person, or animal
Figure A:

Illustrates the wedge osteotomy device into the osteotomy.

Figure B:

Positioning of the K-wires through the proximal fragment. The holes allow the K-wires to either converge or diverge, securing the proximal fragment in place with the osteotomy flush against the platform, and the caudal cortex against the lip of the device.

Figure C:

Resulting wedge after completion of the proximal osteotomy during the WOCCWO.


Shamir, Shelly K., et al. “Ex Vivo Evaluation of a Novel Surgical Guide on the Accuracy of Closing Wedge Osteotomies.” Wiley Online Library, John Wiley & Sons, Ltd, 23 May 2019,


Last updated: December 2020