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A gymnast couldn't bend his knees after an accident. His doctors told him that the reason behind this is a tear in the knee muscle.
Which of these muscle system disorders best represents the condition of the gymnast's knees?Muscle strain

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Muscle strain and muscle length change to move a load. During isometric contractions, muscle length does not change because the load exceeds the tension the muscle can generate.

Which muscles are required when extending the leg to kick a ball, among other actions?

The quadriceps, iliopsoas, and knee extensor muscles, particularly the rectus femoris, create a concentric activity to produce a fast forward velocity toward the ball by extending the knee and flexing the hip as the kicking limb begins forward movement in stage 4.

What kind of muscle contraction doesn't result in bone movement or an alteration in angle?

When a muscle contracts isometrically, the angle of a skeletal joint remains the same while tension is produced in the muscle. Sarcomeres shorten and muscles become tenser during isometric contractions, but the load is not moved since the force generated is insufficient to overcome the load's resistance.

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