Knee joint prosthesis and tibial component and femoral component thereof

Abstract

A knee joint prosthesis and a tibial component thereof and a femoral component thereof are disclosed. The knee joint prosthesis includes a tibial component and a femoral component. The tibial component has a top surface, a bottom surface opposite the top surface and a first slot passing through the top surface and the bottom surface for accommodating a cruciate ligament. The tibial component has at least one first protrusion disposed on the bottom surface, and the first protrusion has a plurality of first through holes. The femoral component is carried by the tibial component and has a second slot for accommodating the cruciate ligament. The femoral component has at least one second protrusion disposed on a surface thereof against the tibial component, and the second protrusion has a plurality of second through holes.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This Non-provisional application claims priority under 35 U.S.C. §119(a) on Taiwan Patent Application No(s). 104105153 filed in Taiwan, Republic of China on Feb. 13, 2015, and China Patent Application No(s). 201610023838.1 filed in People's Republic of China on Jan. 14, 2014 the entire contents of which are hereby incorporated by reference.BACKGROUND[0002]1. Technical Field[0003]The invention relates to a joint prosthesis, in particular to a knee joint prosthesis.[0004]2. Related Art[0005]Knee is the biggest human joint. It sustains a person's weight and lets the leg finely exercise flexion and extension. It includes the femoral condyles of the femur distal end, the tibial plateau of the tibia proximal end, the ligament (for example, the anterior cruciate ligament, the posterior cruciate ligament, the medial ligament and the lateral ligament, etc.), and the joint cartilage and meniscus. However, development defects of lower limb joints, b...

AI Technical Summary

Benefits of technology

The patent describes a knee joint replacement that includes a cruciate ligament-retaining feature which helps to keep the postoperative joint stable and reduces wear of the new joint. This feature improves the overall results of the surgery and makes it easier for patients to recover and resume their daily activities.

Problems solved by technology

However, development defects of lower limb joints, bad standing, excessive exercises or ageing usually cause wears of joint cartilage and meniscus, so the lubricating fluid of knee articular capsule becomes less resulting in knee pain, swelling, difficult squat or other exercise impediment for example degenerative knee joint disease.

More serious, it causes bowleg and the patient walks difficultly.

However, due to the life time of the knee joint prosthesis, the joint liner b2 substituting the knee meniscus suffers from the friction cause by the abutting surface a1 of the femoral implant a, thus it is damaged and incapable to use.

Besides, when the patient's knee exercises at an excessively angle or very intensively, the central protrusion b22 on the joint liner b2 may wear overly or may depart from the indentation a3 of the femoral implant a which causes dislocation.

Even it is necessary to thwack a longer bone peg to keep the femoral implant a stable in the femur Fe or the tibia assembly b stable in the tibia T when implanting new femoral implant a or the tibia assembly b, so it causes more serious damage.

Therefore, it is an unsolved problem in the field to dispose the joint prosthesis component stably on the implanted portion without using bone peg.

It may cause the skin or muscle tissue at the affected area necrosis, more seriously, it may cause the patient death due to myocardial infarction.

Therefore, it is also an unsolved problem to keep considerable stability of the implanted knee joint prosthesis when decreasing the usage of the bond cement.

Thus, the stability of the patient's postoperative knee is insufficient, and the patient's postoperative knee cannot bend at too large angle.

Therefore, it is also an unsolved problem to provide a knee joint prosthesis adapted to cruciate ligament-retaining when performing total keen joint replacement so as to retain the anterior cruciate ligament and the posterior cruciate ligament of the patient.

Images