If the curves of the posterior knees are not accurately positioned just above the bend of the "axial viewer" for a tangential knee projection (Merchant method), the
1)patellae may be projected into the patellofemoral joint spaces.
2)tibial tuberosities may be demonstrated within the joint spaces.
3)soft tissue from the anterior thighs is projected into the joint spaces.
4)knees are flexed more or less than 45 degrees.
A) 1 and 4 only
B) 1 and 2 only
C) 2 and 3 only
D) 1, 2, and 4 only

Question

Quizplus · Accepted Answer

The correct positioning of the knees is crucial for the tangential knee projection (Merchant method) to accurately visualize the patellofemoral joint spaces without obstruction. If the curves of the posterior knees are not properly aligned just above the bend of the axial viewer, it can lead to the patellae being projected into the patellofemoral joint spaces and potentially cause the knees to be flexed more or less than the ideal 45 degrees. The tibial tuberosities being demonstrated within the joint spaces is also a possibility due to incorrect positioning, affecting the clarity and diagnostic value of the images.

If the Curves of the Posterior Knees Are Not Accurately