- Roberts View:
- true
AP view described by Roberts:
- take AP view of thumb w/ forearm in
maximal pronation & dorsum of
thumb resting on the x-ray cassette;
- True Lateral of CMC:
- obtained w/ forearm flat on table, hand pronated approx 20 deg w/
thumb flat on cassette, & x-ray tube angled 10 deg from vertical in
distal to proximal projection;
- allows evaluation of metacarpal displacement;
- estimates of the size and position of the volar fragment
- estimates gap between fragment & metacarpal base;
- Case Example:
- 20 year old male who sustained extra-articular basal frx of thumb;
- on AP and Oblique views the displacement is not impressive;
- on a true lateral view, however, the indication for surgery is apparent;
