PMC7498657_01
T1-weighted pre- and post-contrast transverse MR images of a German shorthaired pointer dog with rupture of the common tendons of the biceps femoris, gracilis, and semitendinosus (accessory ischial muscles) in the left pelvic limb. A vitamin-E capsule (asterisk) is positioned at the level of the left calcanean tendon visible in images (A-D). (A) T1-weighted pre-contrast transverse image of the common tendons of the accessory ischial muscles (long arrow), gastrocnemius tendon (arrowhead), and superficial digital flexor tendon (short arrow). (B) T1-weighted post-contrast transverse image of the common tendons of the accessory ischial muscles (long arrow), gastrocnemius tendon (arrowhead), and superficial digital flexor tendon (short arrow) separated by contrast enhancing tissue in the left pelvic limb. (C) T1-weighted pre-contrast transverse image showing disruption of the common tendons of the accessory ischial muscles (long arrow) with adjacent gastrocnemius tendon (arrowhead) and superficial digital flexor tendon (short arrow). (D) T1-weighted post-contrast transverse image showing disruption of the common tendons of the accessory ischial muscles (long arrow) and contrast enhancement of both the common tendons of the accessory ischial muscles and the gastrocnemius tendon (arrowhead) adjacent to the superficial digital flexor tendon (short arrow).
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F1
T2-hyperintense tissue was present that expanded to ~0.8 cm diameter and resulted in displacement of the fibularis longus muscle cranially and the tendons of the gastrocnemius and superficial digital flexor tendons caudally. This tissue had a heterogeneously, intermediate signal intensity on T1W images, and strongly enhanced (Figure 1).
T1-weighted pre- and post-contrast sagittal MR images of a German shorthaired pointer dog with rupture of the common tendons of the biceps femoris, gracilis, and semitendinosus (accessory ischial muscles) in the left pelvic limb. A vitamin-E capsule (asterisk) is positioned at the level of the left calcanean tendon visible in images (A,B). (A) T1-weighted pre-contrast sagittal image of the common tendons of the accessory ischial muscles (long arrow), gastrocnemius tendon (arrowhead), and superficial digital flexor tendon (short arrow). The common tendons of the accessory ischial muscles are thickened just proximal to the calcaneus. (B) T1-weighted post-contrast sagittal image showing disruption and contrast enhancement of the common tendons of the accessory ischial muscles (long arrow), contrast enhancement surrounding the gastrocnemius tendon with heterogenous signal intensity (arrowhead), and contrast enhancement surrounding the superficial digital flexor tendon (short arrow).
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F2
In the sagittal plane, the gastrocnemius and superficial digital flexor tendons were intact; however, the most distal 0.7 cm of the gastrocnemius tendon appeared thinner compared to areas more proximal (Figure 2).
Intraoperative images of a German shorthaired pointer dog with partial rupture of the CCT (rupture of the common tendons of the accessory ischial muscles) in the left pelvic limb. (A) Disruption of the common tendons of the accessory ischial muscles (long arrow) next to the gastrocnemius tendon (short arrow). (B) Area of excised damaged common tendons of the accessory ischial muscles (long arrow) next to the gastrocnemius tendon (short arrow). (C) Reattaching the common tendons of the accessory ischial muscles (long arrow) to the tuber calcaneus (arrowhead), with evidence of a small fold/kink in the gastrocnemius tendon (short arrow). (D) Placement of a modified 3-loop pulley suture using #1 prolene (long arrow) in the common tendons of the accessory ischial muscles through the calcaneus, with evidence of a small fold/kink in the gastrocnemius tendon (short arrow).
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F3
There was a complete disruption of the tendons of the accessory ischial muscles from the tuber calcanei with the distal 2-cm of the tendons having been replaced with fibrous tissue (Figure 3).