SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/soc-acl-stabilizes-knee

The ACL is a ligament that helps keep which joint stable?

The ACL, or anterior cruciate ligament, steadies the knee.

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  1. The shoulder
  2. The ankle
  3. The knee ✔

Why: The ACL runs through the middle of the knee. It stops the shinbone from sliding out in front of the thighbone and helps the knee resist twisting.

Huh, didn't know that: Most ACL injuries happen without anyone hitting the knee, often when a player cuts, pivots or lands from a jump.

The dad joke
Why did the knee go to the party? It wanted to joint in.
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References

Answer: The knee. The ACL runs through the middle of the knee. It stops the shinbone from sliding out in front of the thighbone and helps the knee resist twisting.

  1. AAOS OrthoInfo, Anterior Cruciate Ligament (ACL) Injuries www.orthoinfo.org/diseases--conditions/anterior-cruciate-ligament-acl-injuries
    It prevents the tibia from sliding out in front of the femur and provides rotational stability to the knee.
    Checked 2026-10-12.
  2. AAOS OrthoInfo, Anterior Cruciate Ligament (ACL) Injuries www.orthoinfo.org/diseases--conditions/anterior-cruciate-ligament-acl-injuries
    most ACL injuries happen without direct impact to the knee
    Checked 2026-10-12.

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