By A P Alivisatos Affiliation: Lawrence Berkeley Lab., CA (United States)
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7 Position of the patient, cassette and direction of the x-ray beam to obtain a dorsal 10° proximal-palmarodistal oblique view of the distal metacarpus 61 PART 2 · RADIOGRAPHIC PROCEDURES RADIOGRAPHY OF THE METACARPUS AND METATARSUS a b b c A B Fig. 8 (A & B) Dorsal 10° proximal-palmarodistal oblique radiographic view of the distal metacarpus. a – Third metacarpal, b – Proximal sesamoid, c – Proximal phalanx (P1) 62 PART 2 · RADIOGRAPHIC PROCEDURES RADIOGRAPHY OF THE METACARPUS AND METATARSUS ê Dorsodistal-palmaroproximal view of the distal metacarpus This view is used to highlight the palmar aspect of the distal metacarpal condyles and is particularly useful to ascertain if palmar fragmentation is present in horses with condylar fractures of the third metacarpal bone.
6 (A & B) Dorsomedial-palmarolateral view of a normal adult fetlock. a – Metacarpus, b – Proximal phalanx (P1), c – Medial sesamoid Tips ✔ Angulation of the beam by 60° instead of 45° from dorsal gives a more complete projection of the dorsal articular margins of the proximal phalanx. The 45° oblique views are better for evaluating the regions of insertion of the suspensory ligament branch on the abaxial surface of the proximal sesamoid bone. ✔ Both oblique views can also be obtained by reversing the beam direction, although the cassette will then be positioned further from the joint, increasing geometric distortion.
As with other views, routinely sedating the patient reduces the need for repeat exposures due to movement blur. 41 PART 2 · RADIOGRAPHIC PROCEDURES RADIOGRAPHY OF THE FETLOCK Standard views å Lateromedial (LM) view of the fetlock Positioning The cassette is placed on the medial aspect of the joint, resting on the ground or on a small block. Beam centring and collimation The beam is centred on the lateral epicondyle of the distal metacarpus, horizontal and parallel to the heel bulbs. Fig. 1 Diagram showing positioning of limb, cassette and primary beam to obtain a lateromedial view of the fetlock joint 42 PART 2 · RADIOGRAPHIC PROCEDURES RADIOGRAPHY OF THE FETLOCK a c b B A Fig.
