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US 10,702,399 B2Granted
Posterior stabilized insert trial with adjustable post
AssigneeSmith & Nephew, Inc.
InventorsJason S. Jordan, Theodore P. Firestone
Life of this patent
Estimating the term…
Abstract
Trial joint inserts have posts at different positions relative to the base. During joint replacement surgery, a surgeon can test different positions for a post using a trial insert, identify a suitable position for the post, and then select a permanent insert with a post in the desired position. The devices and methods in this application allow a surgeon to provide an individualized joint replacement for a patient. Joint inserts may be configured so the post moves relative to the base. The post may be adjustably positionable, may lock in place, or may be actuated by a resistance member such as a spring.
Claims20
An orthopedic insert comprising:
- a base having an anterior end and a posterior end,
- a posterior stabilizing post coupled to the base, the posterior stabilizing post including an anterior face that outwardly extends to a position beyond the base, the posterior stabilizing post being adjustably positionable relative to the base along a trough of the base, the trough not extending through the anterior and posterior ends of the base, wherein the posterior stabilizing post is positionable between an anterior block wall and a posterior block wall of the base, and
- first and second locking inserts that extend through the anterior and posterior block walls, respectively, the first locking insert contacting the anterior face of the posterior stabilizing post, the second locking insert contacting a posterior face of the posterior stabilizing post to lock the posterior stabilizing post in place relative to the base;
- and
- wherein the posterior stabilizing post slides within the trough.
2 more elements
A knee implant comprising:
- a tibial component shaped to align with and support the proximal end of a patient's tibia;
- a femoral component shaped to align with and support the patient's femur;
- and
- a tibial insert comprising a base and a posterior stabilizing post coupled to the base, the base having an anterior end and a posterior end, a portion of the posterior stabilizing post extending away from the base and structured to engage the femoral component, the posterior stabilizing post being adjustably positionable relative to the base, and wherein the posterior stabilizing post is biased by a resilient member in a direction toward one of the anterior end and the posterior end of the base, the resilient member being disposed in a trough in the base, the resilient member extending from an end of the trough to the posterior stabilizing post such that a first end of the resilient member contacts the end of the trough and a second end of the resilient member opposite the first end contact the posterior stabilizing post,
- a first locking insert that extends through the anterior end of the base;
- and
- a second locking insert that extends through the posterior end of the base;
- wherein the first and second locking inserts lock the posterior stabilizing post in place relative to the base.
5 more elements
A tibial insert comprising:
- a base;
- a posterior stabilizing post coupled to the base and configured to slide relative to the base, the posterior stabilizing post adapted to couple to a femoral component;
- and
- a resistance member disposed within the base, wherein the resistance member compresses when the posterior stabilizing post slides anteriorly with respect to the base from a force applied to the posterior stabilizing post by the femoral component during movement of a corresponding knee joint from extension to flexion,
- wherein the resistance member is disposed in a trough in the base, the trough having anterior and posterior interior ends, wherein a first end of the resistance member contacts an interior end of the trough and a second end of the resistance member contacts the post, and
- first and second locking inserts that extend through the anterior and posterior interior ends of the trough, respectively, to lock the posterior stabilizing post in place relative to the base.
3 more elements
A tibial insert comprising:
- a base having a trough defined in a superior face of the base and extending in an anterior-posterior direction between an anterior trough wall and a posterior tough wall;
- a spring-actuated posterior stabilizing post coupled to the base and configured to slide relative to the base, wherein the posterior stabilizing post includes an anterior face and a posterior face positioned within the trough;
- and
- a spring coupled to one of the anterior trough wall and the posterior trough wall at a first end and to one of the anterior face and the posterior face at a second end, the spring adapted to compress or extend when the posterior stabilizing post slides with respect to the base, and
- first and second locking screws that extend through the anterior trough wall and posterior trough wall of the base, respectively, the first locking screw contacting the anterior face of the posterior stabilizing post, the second locking insert contacting the posterior face of the posterior stabilizing post to lock the posterior stabilizing post in place relative to the base.
2 more elements
Dependencies are inferred from the claim text.