What is constrained condylar knee?

Constrained condylar knee (CCK) implants are commonly used in a revision setting. They are designed to fix the prosthesis to the host bone at epiphysis and diaphysis to provide good construct stability and provide flexibility to balance the knee in the coronal and sagittal planes.

What is a constrained knee replacement?

Constraint is defined as the effect of the elements of knee implant design that provides the stability needed to counteract forces about the knee after arthroplasty in the presence of a deficient soft-tissue envelope. Determining the amount of constraint necessary can be challenging.

What is a condylar knee?

The total condylar knee prosthesis is a non-hinged surface replacement which can be used for almost all knee deformities.

What is a CCK total knee?

Constrained condylar knee (CCK) prosthesis are common used for revision surgery but can also help surgeons to improve implant stability in primary knee arthroplasty, in fact in severe knee arthrosis with serious deformity associated with a significant instability a more constrained articulation is required.

What is constrained prosthesis?

Constraint. definition. the ability of a prosthesis to provide varus-valgus and flexion-extension stability in the face of ligamentous laxity or bone loss.

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How long do hinged knee replacements last?

Rotating hinge knee implants have a 10-year survivorship in the range of 51% to 92.5%. Complication rates of rotating hinge knee implants are in the range of 9.2% to 63%, with infection and aseptic loosening as the most common complications.

What is a PS knee?

Primary total knee implants are designed to either retain the patient’s own posterior cruciate ligament (cruciate retaining, or CR), or substitute for it (posterior stabilized, or PS). PS implants use a cam and spine feature to serve the function of the posterior cruciate ligament.

What does a condyle do?

Condyle – Refers to a large prominence, which often provides structural support to the overlying hyaline cartilage. It bears the brunt of the force exerted from the joint. Examples include the knee joint (hinge joint), formed by the femoral lateral and medial condyles, and the tibial lateral and medial condyles.

What does condyle mean in medical terms?

Medical Definition of condyle : an articular prominence of a bone —used chiefly of such as occur in pairs resembling a pair of knuckles (as those of the occipital bone for articulation with the atlas, those at the distal end of the humerus and femur, and those of the lower jaw) — see lateral condyle, medial condyle.

What is medial condyle?

Medical Definition of medial condyle : a condyle on the inner side of the lower extremity of the femur also : a corresponding eminence on the upper part of the tibia that articulates with the medial condyle of the femur — compare lateral condyle.

What is cruciate substituting knee replacement?

Highly-conforming polyethylene insert designs were introduced as an alternative to PS knees. The cruciate-substituting (CS) knee was designed to provide anteroposterior stability throughout the full range of motion.

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What is patellar clunk syndrome?

Patellar clunk syndrome occurs when a fibrous nodule develops just proximal to the patellar button. At approximately 30 degrees to 45 degrees from full extension, the nodule catches the anterior flange of the femoral prosthesis, resulting in the clunk and a painful range of motion.

Does knee replacement remove ligaments?

In traditional knee replacement surgery, the surgeon makes a long incision over the middle of the knee and cuts muscles, tendons and ligaments to get to the knee joint. When more tissues, muscles and tendons are cut during surgery, the recovery is more painful and the healing process takes longer.

Can a knee replacement last 30 years?

Total knee joint replacement surgery has been performed for about 30 years. Over those years, incremental improvements in materials and designs have raised the expected life of the “new” knees to 10 to 20 years.

Can I squat after knee replacement?

People who have had TKR report that squatting is an important task for them to be able to complete after surgery. For this reason, and because squatting is a motion required for many functional activities, the ability to squat could be an important task to evaluate after knee replacement.

Can you kneel after a knee replacement?

About 60 to 80 percent of people report difficulty kneeling or an inability to kneel after a total knee replacement. There is currently no clinical evidence to suggest kneeling shortens the life of the prosthesis, but if you’re uncomfortable, you should avoid kneeling.

What is femoral rollback?

It is known that posterior femoral translation (also referred to as femoral rollback) improves quadriceps function and range of knee flexion by preventing posterior impingement at high flexion angles.

What is Posterior Stabilized?

Posterior-stabilized implants attempt to replace the role of the PCL with a polyethylene post and femoral cam that interact to prevent anterior translation of the femur on the tibia, while allowing femoral rollback during flexion.

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What does the PCL connect to?

The posterior cruciate ligament and ACL connect your thighbone (femur) to your shinbone (tibia).

Is condyle a projection or depression?

Learning Objectives

Bone Markings (Table 7.2)
Marking Description Example
Condyle Rounded surface Occipital condyles
Projections Raised markings Spinous process of the vertebrae
Protuberance Protruding Chin

Is condyle a cartilage?

The mandibular condylar cartilage is a secondary cartilage which has a distinct embryonic origin and development distinguishable from other primary cartilages [13]. Primary cartilage is composed solely of collagen type II and grows via interstitial cell proliferation.

What is the condylar process?

The condyloid process or condylar process is the process on the human mandible and some other species’ mandibles that ends in a condyle, the mandibular condyle. It is thicker than the coronoid process of the mandible and consists of two portions: the condyle and the constricted portion which supports it, the neck.

How many condyles are in the knee?

The intercondylar notch separates the two condyles distally and posteriorily. The lateral wall of the notch has a flat impression where the proximal origin of the anterior cruciate ligament (ACL) arises.

What is the difference between epicondyle and condyle?

The condyle is smooth and round whereas epicondyle is rough. Epicondyle is a projection on the condyle. The main difference between condyle and epicondyle is that condyle forms an articulation with another bone. whereas epicondyle provides sites for the attachment of muscles.

What is condyle fracture?

A condylar fracture is a repetitive strain injury that results in a fracture to the cannon bone above the fetlock due to large loads transmitted over the cannon bone during high-speed exercise.