Method and apparatus for performing multidirectional tibial tubercle transfers
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Publication Number
US-8828010-B2
Publication Date
2014-09-09
Expiration Date
Abstract
Apparatus for performing a multidirectional tibial tubercle transfer, comprising a jig for positioning against the anterior portion of the tibia, the jig comprising first and second guide surfaces which simultaneously converge towards one another as they extend distally down, and posteriorly towards, the tibia; a medial extender for attaching to the jig, wherein the medial extender comprises a third guide surface which is directed towards a point distal to the point of convergence of the first and second guide surfaces as the third guide surface extends distally down, and posteriorly towards, the tibia; and a lateral extender for attaching to the jig, wherein the lateral extender comprises a fourth guide surface which is directed towards a point distal to the point of convergence of the first and second guide surfaces as the fourth guide surface extends distally down, and posteriorly towards, the tibia.
Core Innovation
The invention relates to an orthopedic surgical apparatus and a method for performing a multidirectional tibial tubercle transfer. The apparatus includes a jig for positioning against the anterior portion of the tibia, the jig having first and second guide surfaces that simultaneously converge towards one another as they extend distally down the tibia and posteriorly towards the tibia.
An extender is attached to the jig and includes a third guide surface, and in certain arrangements a fourth guide surface. The third guide surface simultaneously converges towards the point of convergence of the first and second guide surfaces of the jig as the third guide surface extends distally down the tibia and posteriorly towards the tibia.
The method performs a sequence of tibial cuts guided by the converging guide surfaces of the jig and the extender. A first cut is made in the tibia, and the first guide surface of the jig is aligned with the first cut. A second cut is then made in the tibia using the second guide surface of the jig, and a third cut is made using the third guide surface of the extender.
Claims Coverage
The independent claims are directed to an apparatus-based method for multidirectional tibial tubercle transfer, centered on converging guide surfaces on a tibia-positioning jig and an attached extender, with guided sequential tibial cuts. The inventive features include the geometry of the converging guide surfaces and, in some cases, how the extender is attached or how medial and lateral extenders and cut sequencing are selected.
Jig and extender with distally and posteriorly converging guide surfaces
A tibia-positioning jig positioned against the anterior portion of the tibia, wherein first and second guide surfaces simultaneously converge towards one another as they extend distally down the tibia and posteriorly towards the tibia, and an extender attached to the jig that includes a third guide surface simultaneously converging towards the point of convergence of the first and second guide surfaces as the third guide surface extends distally and posteriorly.
Extender attached via an arcuate slot to the jig
The extender comprises an arcuate slot and is attached to the jig by means of the arcuate slot.
Extender slot with third guide surface defining a portion of the slot
The extender comprises a slot and the third guide surface defines a portion of the slot.
Medial and lateral extenders directed distal to the jig convergence point with size-based cut sequencing
A medial extender and a lateral extender are attached to the jig, wherein the medial extender comprises a third guide surface directed towards a point distal to the point of convergence of the first and second guide surfaces as the third guide surface extends distally and posteriorly, and the lateral extender comprises a fourth guide surface directed towards a point distal to the point of convergence as the fourth guide surface extends distally and posteriorly; determining if the jig is appropriately sized for the patient and executing different cut sequences depending on the determination.
Extender with third and fourth distally and posteriorly converging guide surfaces
An extender comprises a third guide surface and a fourth guide surface, wherein the third guide surface and the fourth guide surface simultaneously converge towards the point of convergence of the first and second guide surfaces of the jig as the third and fourth guide surfaces extend distally down the tibia and posteriorly towards the tibia.
The independent claims define a multidirectional tibial tubercle transfer apparatus combining a tibia-positioning jig with first and second guide surfaces that simultaneously converge distally and posteriorly, together with an extender having converging guide surfaces that direct cutting paths. The claims further recite attachment and slot features, and in some cases medial and lateral extenders with patient-sized selection and different cut sequences.
Stated Advantages
Improved precision.
Improved controllability.
Improved reproducibility.
Reduced complexity and reduced time.
Inventory reduction.
Documented Applications
Orthopedic surgical procedures for multidirectional tibial tubercle transfer, including approaches that use right leg and left leg using a symmetrical sidearm to reduce inventory.
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