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I now have all the information needed. The image contains two MCQs from a musculoskeletal anatomy/orthopedics exam. Let me provide the full answer and explanation.
Questions from the Image (the page is upside down)
The visible questions are:
Q4 (partial): Shape of medial collateral ligament (MCL) - options: (a) Broad, (b) Narrow, (c) Pointed, (d) None of the above
Q5: Medial collateral ligament resists ________ forces.
- (a) Lateral
- (b) Medial
- (c) Superior
- (d) Inferior
ANS. key shown: 4.(a), 5.(a)
Answer & Explanation
Q4 - Answer: (a) Broad
The medial collateral ligament (MCL), also called the tibial collateral ligament, is the broader of the two collateral ligaments of the knee. It runs obliquely downward and forward from the medial epicondyle of the femur to the medial surface of the upper tibia (approximately 7-8 cm below the tibial plateau). It has superficial and deep portions separated by loose connective tissue, giving it a flat, broad, band-like shape.
In contrast, the lateral collateral ligament (LCL/fibular collateral ligament) is a round cord - hence it is narrow and cord-like, while the MCL is distinctly broad and flat.
- General Anatomy and Musculoskeletal System (THIEME Atlas): "The medial collateral ligament (tibial collateral ligament) is the broader of the two ligaments."
Q5 - Answer: (a) Lateral
The MCL resists lateral forces (i.e., valgus stress). Here's why:
- The collateral ligaments stabilize the knee in the coronal (frontal) plane.
- When a force pushes the knee from the lateral side (valgus force - knee caves inward), the MCL on the medial side is stretched and must resist this lateral/valgus force.
- Injury to the MCL classically occurs with a blow to the lateral aspect of the knee, which creates a valgus stress and overstretches the medial collateral ligament.
- Think of it this way: the MCL is on the medial side, so it resists forces that push the leg laterally (outward angulation at the knee = valgus).
Both collateral ligaments are taut in knee extension and stabilize the joint against coronal plane forces - the MCL resists valgus (lateral) force, and the LCL resists varus (medial) force.
- General Anatomy and Musculoskeletal System (THIEME Atlas): "Both collateral ligaments stabilize the knee joint in the coronal plane."
Quick Memory Tip
| Ligament | Shape | Resists |
|---|---|---|
| MCL (medial) | Broad, flat band | Lateral (valgus) forces |
| LCL (lateral) | Round cord (narrow) | Medial (varus) forces |
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