Very painful indeed.
Because if your ligaments are injured, bone to bone friction can occur!
To avoid bone-on-bone friction.
catrilage covers the ends of bone and reduces the friction between them.
cartilage
So your back can be flexible. Think about how it moves.
Allows joints to move smoothly and without friction.
The patella bone is classified as a sesamoid bone, which is a type of irregular bone. Sesamoid bones form within tendons where there is high friction and stress, such as the patella within the quadriceps tendon.
Cartilage connects bone to bone in the human body by providing a smooth surface for bones to glide against each other. It acts as a cushion and reduces friction between bones, allowing for smooth movement and flexibility in joints.
The cartilage and fiberous tissue create an impact zone and the fatty materials there lubricate the mechanical hinge of the bones. The joint structure itself however holds no friction reduction, it is the secondary structure of soft tissues that do all of the protection.
Epiphysis-The epiphysis is the end of a long bone.
as a result of Rheumatoid arthritis some of my joints have lost a lot of their cartilage. the result is extra friction which deforms the joints in the bone and causes some serious pain.
The cartilage that articulates with another bone or bone process is called articular cartilage. It covers the ends of bones within joints and helps to reduce friction and absorb shock during movement.