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The knee joint is the largest joint in the human body. It is very complex as it can pivot in almost every direction and is exposed to tremendous stresses. Over time, this can lead to degenerative changes. What's more, our knees are very vulnerable to injury whether it’s sudden injury, injury from overuse or injury from an underlying condition, such as arthritis.
The knee is the largest joint in the human body. It has a pivotal hinged joint which allows flexion and extension of the leg as well as slight internal and external rotation when flexed.
Due to the complex anatomy of the knee, knee pain can have many causes. However, these can be divided into knee pain resulting from injuries and knee pain resulting from degenerative changes.
The common causes of knee pain are:
While a knee injury often causes pain in young people (for example during sports), degenerative changes of the knee often lie behind the pain experienced by middle-age to elderly people.
There are also other factors that can cause knee pain (e.g. overstrain in sports or hereditary factors such as congenital knee deformities).
Acute knee injuries are mainly caused by the action of external forces (e.g. contusions, kicks during sports or impacts during a road traffic accidents). The following anatomical structures are often affected:
High risk sports associate with knee injuries are mainly football, downhill skiing, netball and basketball.
If you have an acute knee injury, experts recommend applying the RICE rule:
Our knees are exposed to tremendous stresses every day which can result in wear and tear of the joint. These degenerative changes are associated with a breakdown of the cartilage layer which gradually wears away. The shock absorber function of the cartilage becomes inefficient and makes the joint feel stiff and painful.
Joint degeneration increases with age and occurs most often in people over 50 years of age. This is called osteoarthritis of the knee joint. Osteoarthritis of the knee is progressive. Early stages osteoarthritis only occurs occasionally (e.g. on weight-bearing, after longer periods of rest), while in the advanced stage, the cartilage damage is so extensive that the bones grind against each other and is extremely painful.
Knee pain can come immediately (acutely) or build up over time (chronically):
The treatment of knee pain depends on what is causing the pain. The following conservative therapies are often applied before any invasive treatment:
However, there are also situations, in which an operation is the only option left. But these days, many operations can be performed by arthroscopy which minimises tissue damage and less invasive.
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