The fact that most injuries are joint related – knee, spine, ankle, shoulder, etc – shows the importance of joint strength.
Joint strength (e.g. strength of a knee) is what allows you to complete a movement with control and accuracy, aiding power and avoiding injury. It is the sum of the strength of the multitude of the small muscles, tendons and ligaments that surround your joints. A strong thigh muscle will give your leg movement great strength, but without an equally strong knee you can’t control that movement.
the specialist thought i had stretched my acl and advised trying to strengthen the muscles around my knee for extra stability as surgery wasn’t an option. the cool board has proved brilliant, and as it is good fun using it i find i go on it a lot more then if i was just doing some exercises.