Which of the following is true regarding the proximal interphalangeal (PIP)and distal interphalangeal (DIP)joints of the digits two through five?
A) They are not true synovial joints.
B) They do not have any collateral ligaments to resist valgus and varus stresses.
C) The proximal articulating surface is larger than the distal articulating surface.
D) They are biaxial joints with two degrees of freedom.

Question

Quizplus · Accepted Answer

The proximal articulating surface is larger than the distal articulating surface in the PIP and DIP joints of digits two through five. This allows for greater range of motion in flexion and extension, while the smaller distal articulating surface helps resist lateral stresses. Options A and B are incorrect, as these joints are in fact true synovial joints and do have collateral ligaments. Option D is incorrect, as these joints are actually considered uniaxial with only one degree of freedom.

Which of the Following Is True Regarding the Proximal Interphalangeal