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Flexor Carpi Ulnaris Tendonopathy

Flexor Carpi Ulnaris Tendonopathy. Accession # 105218 Erica Fields, DVM. Dakota Vincent. 7 yo FS Weimaraner Developed ST swelling – left caudal antebrachium – 1 mo prior to presentation, after playing outside rDVM aspirated as mesenchymal neoplasia. Radiographs.

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Flexor Carpi Ulnaris Tendonopathy

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  1. Flexor Carpi Ulnaris Tendonopathy Accession # 105218 Erica Fields, DVM

  2. Dakota Vincent • 7 yo FS Weimaraner • Developed ST swelling – left caudal antebrachium – 1 mo prior to presentation, after playing outside • rDVM aspirated as mesenchymal neoplasia

  3. Radiographs • Chip fractures associated with the radial carpal bone • Soft tissue swelling proximal to accessory carpal bone • No evidence of bony lysis

  4. LATERAL

  5. DORSOPALMAR

  6. OBLIQUE

  7. Ultrasound • Allows better examination of soft tissue structures (muscle, tendon, ligament) • Good spatial resolution • Can assess blood flow • Biopsy guidance

  8. Anatomy • Flexor carpi ulnaris • Two bellies (ulnar and humeral heads) • Becomes flat tendon, inserts on acc. carpal • Sits lateral and deep to SDF • Flexes and abducts carpus • Prevention of hyperextension • Palmar fibrocartilage • Flexor retinaculum • Palmar ligaments Kuan, et al, 2007 and Whitelock, 2001

  9. Anatomy

  10. Anatomy • Tendons in general • Collagen fibrils surround parallel rows of fibroblasts • Symmetrical crimp • Paratenon and epitenon contain blood supply • Sheathed when crossing joints • Injury: capillary hemorrhage, ischemia, necrosis, fluid accumulation, granulation tissue Denny, 2004

  11. Strain Injury • Injury to musculotendonous unit • First through third degrees • Can be acute or due to chronic stresses (e.g. racing Greyhounds) • Acute treatment: rest, cold, immobilization (3 wks) • Rehabilitation needed later to maintain function • Surgical tx needed for ruptures Denny, 2004

  12. FCU Injury • Usually seen in racing Greyhounds • Reported in 1 Weimaraner • Our surgeons report seeing it in other Weimaraners • Repetitive (or acute?) stress injury Kuan, et al. 2007

  13. References • Dee JF and Dee LG. 1985. Fractures and dislocations associated with the racing greyhound. In Textbook of Small Animal Orthopaedics. IVIS, Ithaca, NY. www.ivis.org • Denny HR. 2004. Tendon injuries. Proceedings of the 29th World Congress of the World Small Animal Veterinary Association. www.vin.com • Kuan SY, Fearnside SM, Black AP, and Allan GS. 2007. Flexor carpi ulnaris tendonopathy in a Weimaraner. Australian Veterinary Journal; 85: 401-404. • Whitelock R. 2001. Conditions of the carpus in the dog. Companion Animal Practice. Jan. 01.

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