Question

question 5
one of the most common knee injuries involves the tearing of the anterior cruciate ligament (acl).
how would an injury like this affect the function of the knee?
ligaments lubricate the cartilage in a joint, and a tear would allow the lubricant to leak out, causing bones to grind against each other and making it painful to bend the knee.
ligaments hold the bones of the knee in the proper orientation, so tearing the ligament could disrupt the alignment of the knee, making bending difficult.
ligaments attach muscle to bone, so tearing of the ligament would mean that muscles would no longer be able to cause the joint to bend.
ligaments are the muscles that surround a joint. muscle tears can be painful but heal quickly and usually do not affect knee function.

Explanation:

Ligaments connect bone to bone and help stabilize joints. The ACL specifically helps prevent the tibia from sliding too far forward relative to the femur. If torn, joint stability is compromised.

• The first option is incorrect as ligaments do not lubricate cartilage (synovial fluid does).
• The third option is wrong because tendons attach muscle to bone, not ligaments.
• The fourth option is incorrect as ligaments are not muscles. Muscles are different tissues (ligaments are fibrous connective tissues). The second option is correct as ligaments (like ACL) hold bones in proper orientation in a joint. Tearing disrupts alignment and makes bending (and other movements) difficult due to instability.

Answer:

Ligaments hold the bones of the knee in the proper orientation, so tearing the ligament could disrupt the alignment of the knee, making bending difficult.