What is Wiberg patella?
Wiberg classification is a system used to describe the shape of the patella based mainly on the asymmetry between the patellar medial and lateral facets on axial views of the patella. Increasing number type indicates a larger degree of asymmetry.
What is Wiberg type 2 patella?
Wiberg classification is a system used to describe the shape of the patella based mainly on the asymmetry between the patellar medial and lateral facets on axial views of the patella. Increasing number type indicates a larger degree of asymmetry. This case is a good example of Wiberg type 2 or b.
What is type 1 patella?
Wiberg type 1 or a roughly symmetrical facets. concave facets. equally sized facets. although presumably the ideal shape of the patella, it is in fact rather uncommon, occurring in only 10% of the general population.
What shape classification is patella?
Structure. The patella is a sesamoid bone roughly triangular in shape, with the apex of the patella facing downwards.
What is Trochlear dysplasia?
Instead of a groove, some patients have a flat or a dome-shaped trochlea. This condition is called trochlear dysplasia. When an individual has a flat or dome-shaped trochlea, the patella loses stability and can track to the outside of the knee as the knee bends.
How common are patellar fractures?
Fractures of the patella account for about 1% of all skeletal injuries and can lead to profound impairment due to its crucial function in the extensor mechanism of the knee.
What causes Trochlear dysplasia?
Most cases of trochlear dysplasia are believed to be genetic. There may be some cases where somebody sustains a kneecap dislocation that is not put back in place when they are young and developmentally the trochlear groove may not form normally, but overall most cases of trochlear dysplasia are felt to be genetic.
What age does patella form?
When the child is somewhere between 2 and 6 years old, their cartilage patella starts forming a center of bone. Often, the kneecap will start to form bone at multiple centers within the cartilage. About 5 percent of the time, some of these bone centers do not fuse together with the main bone center.
What is the patella on the knee?
The patella is a small bone located in front of the knee joint — where the thighbone (femur) and shinbone (tibia) meet. It protects the knee and connects the muscles in the front of the thigh to the tibia.
What is Wiberg?
How do kneecaps form?
Often, several pieces of cartilage will begin to harden into bone at the same time, eventually fusing until the kneecap is one complete bone. This process continues through the years of childhood. Typically, by age 10 or 12, the kneecap is fully developed into a bone.
What is trochlea in knee?
The trochlea is a groove in the femur bone underneath the kneecap (patella). The walls of the trochlea stabilize the patella and allow it to glide down the center of the trochlea as the knee bends.