Refer to the following plain film image for questions 4, 5, & 6: The above plain

Question

Refer to the following plain film image for questions 4, 5, & 6: The above plain film image is a classic image of excessive genu varum (bow-legged). What would you suspect that the angle of inclination would be at the proximal femur? 4. a. Normal b. Coxae valgum c. Coxae varum d. None of the above 5. Genu varum would cause excess compressive forces on which osseous structures? a. Lateral b. Medial c. Center d. None of the above Genu varum would cause excess tensional forces on which extraarticular (outside the joint) ligamentous structure? 6. a. MCL b. LCL C. ACL d. PCL

Explanation / Answer

4. B. Coxa valgum. The normal angle at proximal femur or at neck of femur is 135°. In genu varum there is bowing of knees means kness are far from each other than normal. For this to happen the inclination have to increase more than 135° so as to make knees apart from each other.

5. B. Medial. As the knees are away from each other making them bend outwards and producing more pressure or compression at medial side to overcome that outward bend.

6. B. LCL (lateral collateral ligament)

As both Anterior and Posterior collateral ligament are articular ( inside the joint). And the knee is bend outwards which will relax the MCL but will tense LCL to provide that strength for knee to neutralize the force due to outwards bending.

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