Tibio-femoral trial implant
Inventors
Siccardi, Francesco • Bernardoni, Massimiliano • BECCARI, Alessio • NEDOPIL, Alexander • Howell, Stephen
Assignees
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Publication Number
US-12514717-B2
Publication Date
2026-01-06
Expiration Date
Abstract
A tibial-femoral trial implant comprises a femoral trial insert, which comprises a medial condyle and a lateral condyle, and a tibial trial insert, which comprises a medial plate and a lateral plate. The implant further comprises a graduated reference system adapted to indicate the relative angular deviation between the femoral trial insert and the tibial trial insert about a vertical axis, passing through the center of a sphere defining the medial condyle of the femoral trial insert, following a roto-translational movement of the femoral trial insert from a first position, identifying a knee extension position, to a second position, identifying a knee flexion position.
Core Innovation
The invention is a tibial-femoral trial implant comprising femoral and tibial trial inserts. The femoral insert has medial and lateral condyles, and the tibial insert has medial and lateral plates. A graduated reference system formed on at least one insert indicates their relative angular deviation about a vertical axis after movement from a knee extension position to a knee flexion position.
The described geometry includes a spherical medial condyle and a complementary concave medial plate. The reference system includes marks and notches, with a femoral notch aligning with a central tibial notch in extension and lateral tibial notches during flexion. The marks span ±20° in 5° intervals.
Claims Coverage
The relevant claims identify one independent claim and one principal inventive feature.
Graduated angular reference for the trial implant
The independent claim covers femoral and tibial trial inserts with a graduated reference system that indicates their relative angular deviation about a vertical axis following movement from knee extension to knee flexion. The dependent-claim summary further describes the medial articular geometry, placement and spacing of reference marks, and alignment of femoral and tibial notches to indicate deviation after flexion.
The claims center on a graduated reference system for indicating relative angular deviation between the femoral and tibial trial inserts as the implant moves from extension to flexion, with dependent claims refining the geometry and reference features.
Stated Advantages
The system provides immediate intraoperative feedback on rotation and component positioning without robotic or other bulky equipment.
Documented Applications
The trial implant is used to assess femoral rotation relative to the tibia during knee flexion and to provide intraoperative feedback on rotation and component positioning.
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