Method of using an adjustable tibial sizer

Patent metadata

Field	Value
Publication number	US-12471802-B2
Application number	US-202318342196-A
Country	US
Kind code	B2
Filing date	Jun 27, 2023
Priority date	Dec 20, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

This disclosure relates to a method of using an adjustable tibial sizer for use in knee arthroplasty. The sizer includes a two-part body comprising: a first body portion, a second body portion, and a connection element extending therebetween.

First claim

The invention claimed is:

1 . A method of selecting an appropriately sized tibial base plate, the method comprising steps of:
placing an adjustable tibial sizer on a cut surface of a resected tibia so that a most-medially located surface of a first body portion of the adjustable tibial sizer is against a surface created by a sagittal cut, and a most anteriorly placed point on the first body portion corresponds with a most-anteriorly placed point on the tibia; moving a second body portion of the adjustable tibial sizer relative to the first body portion, simultaneously in an anterior-posterior direction and a medial-lateral direction until a most-posteriorly placed point on the second body portion corresponds with a most-posteriorly placed point on the tibia; and measuring a ratio of an anterior-posterior dimension of the adjustable tibial sizer to a medial-lateral dimension of the adjustable tibial sizer.

2 . The method of claim 1 , wherein moving the second body portion comprises operating the adjustable tibial sizer to simultaneously move the first body portion relative to the second body portion in the anterior-posterior direction and the medial-lateral direction.

3 . The method of claim 2 , wherein moving the second body portion comprises sliding the first and second body portions along a ramp surface configured for simultaneous movement of the first body portion relative to the second body portion in the anterior-posterior direction and the medial-lateral direction.

4 . The method of claim 1 , further comprising step of: selecting an appropriately sized tibial base plate having a ratio of an anterior-posterior dimension to a medial-lateral dimension that generally corresponds with the measured ratio of the anterior-posterior dimension to the medial-lateral dimension of the adjustable tibial sizer.

5 . A method of using an adjustable tibial sizer to aid in selecting an appropriately sized tibial base plate, the method comprising steps of:
using an adjustable tibial sizer that comprises a two-part body which comprises a first body portion, a second body portion, and a connection element extending therebetween, wherein each of the first and second body portions includes a ramp surface configured for simultaneous movement of the first body portion relative to the second body portion in an anterior-posterior direction and a medial-lateral direction; placing the adjustable tibial sizer on a cut surface of a resected tibia so that a most-medially located surface of the first body portion is against a surface created by a sagittal cut, and a most anteriorly placed point on the first body portion corresponds with a most-anteriorly placed point on the tibia; moving the second body portion relative to the first body portion, simultaneously in the anterior-posterior direction and the medial-lateral direction until a most posteriorly placed point on the second body portion corresponds with a most posteriorly placed point on the tibia; and measuring a ratio of an anterior-posterior dimension of the adjustable tibial sizer to a medial-lateral dimension of the adjustable tibial sizer.

6 . The method of claim 1 , further comprising step of:
selecting an appropriately sized tibial base plate having a ratio of an anterior-posterior dimension to a medial-lateral dimension that generally corresponds with the measured ratio of the anterior-posterior dimension to the medial-lateral dimension of the adjustable tibial sizer.

Assignees

• Depuy Ireland Ultd Co
• Depuy Ireland Unlimited Company Loughbeg Ind Estate

Inventors

• Wolfson David

Classifications

• A61B5/4585

  Evaluating the knee · CPC title

• A61B5/6878

  Bone · CPC title

• A61B17/157

  Cutting tibia · CPC title

• A61F2002/4628

  with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping · CPC title

• A61F2002/4658

  for measuring dimensions, e.g. length · CPC title