Artificial knee joint
First Claim
1. An artificial knee joint that is used in a total knee replacement to join a femur and a tibia to each other using a reconstruction anterior cruciate ligament formed by a plurality of bundles of reconstruction ligaments, the artificial knee joint comprising:
- a femur member configured to be mounted on a distal end of the femur; and
a tibia member comprising a base part configured to be mounted on a proximal end of the tibia,whereina medial condyle and a lateral condyle are provided in the tibia member, the medial condyle and the lateral condyle of the tibia member are configured to be in direct contact with a medial condyle and a lateral condyle of the femur member, respectively,a ligament insertion hole piercing the tibia member and a prominence are provided between the medial condyle and the lateral condyle of the tibia member,the ligament insertion hole is a through-hole extending continuously and completely through both a top surface of the tibia member and the base part of the tibia member such that the ligament insertion hole is configured to receive the reconstruction anterior cruciate ligament in order to allow the reconstruction anterior cruciate ligament to extend through the ligament insertion hole,the prominence is formed between the ligament insertion hole and a notch provided in a rear portion of the tibia member,the prominence projects more towards the femur member than the medial condyle and the lateral condyle of the tibia member, anda recess extending anteroposteriorly along the artificial knee joint is provided at a tip of the prominence in order to generate an appropriate interference state for each of the bundles of the reconstruction ligaments of the reconstruction anterior cruciate ligament throughout knee flexion and extension.
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Accused Products
Abstract
The present invention provides an artificial knee joint that can reconstruct an anterior cruciate ligament in a state close to an original function. An artificial knee joint (1) that is used in a total knee replacement includes a femur member (10) and a tibia member (20). The tibia member (20) has a ligament insertion hole (20h) which pierces the tibia member (20) and which is formed at a position where once an anterior cruciate ligament (ACL) exists in a knee replaced for the artificial knee joint (1). Therefore, a ligament can be provided such that a distal end (DT) of a femur (F) and a proximal end (PE) of a tibia (T) are joined to each other by passing the ligament through the ligament insertion hole (20h), which allows the anterior cruciate ligament (ACL) to be reconstructed so as to be in the substantially same state as a knee replaced for the artificial knee joint (1).
27 Citations
12 Claims
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1. An artificial knee joint that is used in a total knee replacement to join a femur and a tibia to each other using a reconstruction anterior cruciate ligament formed by a plurality of bundles of reconstruction ligaments, the artificial knee joint comprising:
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a femur member configured to be mounted on a distal end of the femur; and a tibia member comprising a base part configured to be mounted on a proximal end of the tibia, wherein a medial condyle and a lateral condyle are provided in the tibia member, the medial condyle and the lateral condyle of the tibia member are configured to be in direct contact with a medial condyle and a lateral condyle of the femur member, respectively, a ligament insertion hole piercing the tibia member and a prominence are provided between the medial condyle and the lateral condyle of the tibia member, the ligament insertion hole is a through-hole extending continuously and completely through both a top surface of the tibia member and the base part of the tibia member such that the ligament insertion hole is configured to receive the reconstruction anterior cruciate ligament in order to allow the reconstruction anterior cruciate ligament to extend through the ligament insertion hole, the prominence is formed between the ligament insertion hole and a notch provided in a rear portion of the tibia member, the prominence projects more towards the femur member than the medial condyle and the lateral condyle of the tibia member, and a recess extending anteroposteriorly along the artificial knee joint is provided at a tip of the prominence in order to generate an appropriate interference state for each of the bundles of the reconstruction ligaments of the reconstruction anterior cruciate ligament throughout knee flexion and extension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification