Knee injuries are a classic high-yield topic for the AKT, especially since they often present in primary care or A&E. Let's break down the big ones: ACL ruptures and meniscus tears.

1. Anterior Cruciate Ligament (ACL) Injury

This usually happens during a "non-contact" twisting injury (like pivoting in football or skiing).

• Presentation: Patients often describe a loud "pop" followed by immediate, significant swelling (hemarthrosis within 0-2 hours) and a feeling of the knee "giving way."
• Examination Tests:
  • Lachman Test: The most sensitive test. With the knee at 20-30° flexion, you pull the tibia forward. A "mushy" or absent end-point suggests a tear.
  • Anterior Drawer Test: Similar to Lachman but with the knee at 90°. Less sensitive because the hamstrings can guard and stabilize the joint.
• Management:
  • Initial: RICE (Rest, Ice, Compression, Elevation) and crutches.
  • Long-term: Intense physiotherapy is first-line. Surgery (ACL reconstruction) is usually reserved for young, active individuals or those with persistent instability.

2. Meniscal Tears

These are often caused by a twisting injury while the foot is fixed, but the onset is usually more gradual than an ACL tear.

• Presentation: Pain is localized to the joint line. Swelling (effusion) often develops more slowly (over 6-24 hours). Key symptoms include locking (unable to fully extend the knee) or catching.
• Examination Tests:
  • McMurray’s Test: Flex the knee and rotate the tibia while extending. A palpable "click" or pain at the joint line is positive.
  • Thessaly Test: The patient stands on one leg (knee flexed to 20°) and twists. This is quite specific for meniscal pathology.
• Management:
  • Small tears often settle with conservative management (physio).
  • If the knee is "locked," it usually requires urgent orthopedic referral for arthroscopic repair or partial meniscectomy.

I'll pull up some high-yield lessons that cover these clinical features and the specific exam maneuvers you'll need to know for the UKMLA.

Visualizing the anatomy and the specific tests can really help things click. Let me find a diagram that shows the knee ligaments and the joint line, which is so important for diagnosing these.

Here is a clear look at the anatomy. Notice how the ACL sits deep in the center to prevent the tibia from sliding forward, while the menisci act as the shock-absorbing "cushions" on the joint line.

To help you differentiate these in a clinical scenario, here's a quick comparison table of the key features.

One last high-yield tip for the AKT: Ottawa Knee Rules. These help you decide if an X-ray is needed for an acute knee injury. You should order an X-ray if any of these are present:

• Age 55 or older
• Isolated tenderness of the patella
• Tenderness at the head of the fibula
• Inability to flex to 90°
• Inability to bear weight (4 steps) immediately and in the A&E department

Would you like to try a few practice questions on this to see how it's tested?