Document Type : Clinical Report
Authors
1 Department of Veterinary Clinical Sciences, Karaj Branch, Islamic Azad University, Karaj, Iran
2 Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
Abstract
Superficial digital flexor tendon (SDFT) plays an important role in the locomotion of the horses with flexion of the limbs. In the hind limb, it passes over the calcaneal bone and attaches to medial and lateral surfaces of calcaneous by two bands of connective tissue; while, the medial band is weaker than the lateral one. Occasionally, severe trauma, over-extension or fracture of the calcaneous may cause rupture of the supportive bands leading to tendon luxation. An 11-year-old Thoroughbred jumping gelding with symptoms of lameness in both legs, after examination by an internal specialist veterinarian in equine practice field was referred to the Teaching and Research Hospital of the Faculty of Veterinary Medicine of the University of Tehran, Tehran, Iran. Clinical examination showed lateral luxation of SDFT in the right and left tarsal joints. Radiography revealed no sign of calcaneal involvement, except soft tissue swelling. In the radiography of the tarsal joints, the calcaneus bones did not show significant changes, but among the bones of the central and 3rd tarsal bone (distal intertarsal joint) of the tarsus, osteophyte formation was observed to a mild extent, indicating mild bone spavin in both tarsal joints. In ultrasonography, SDFT thickenings accompanied by hypoechoic regions in tendons were seen, confirming the signs of tendonitis. Moreover, fibrous tissue formation was diagnosed. In the left leg, anechoic fluid in the calcaneous bursa was seen. Evaluation of diagnostic imaging findings enables veterinarians to diagnose the site and extent of the lesions, choosing the appropriate therapeutic approach in addition to clinical symptoms.
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- O'Brien C, Marr N, Thorpe C. Microdamage in the equine superficial digital flexor tendon. Equine Vet J 2020; 53(3): 417-430.
- Foerner JJ. Surgical treatment of selected musculoskeletal disorders of the rear limb. In Auer JA, Stick JA (Eds). Equine surgery. 2nd Philadelphia, USA: WB Saunders Company 1992; 1055-1075.
- Mc Ilwraith CW. Disease of joints, tendons, ligaments and related structures. In: Stashak TS (Ed). Adams’ lameness in horses. 5th Philadelphia, USA: Lippincott Williams & Wilkins 2002; 634.
- Baxter GM. Adams and Stashak's lameness in horses. 7th Hoboken, USA: Wiley-Blackwell 2020; 927-935.
- McNicholas WT Jr, Wilkens BE, Barstad RD. Luxation of the superficial digital flexor tendon in a cat. J Am Anim Hosp Assoc 2000; 36(2): 174-176.
- Emond AL, Coudry V, Seignour M, et al. Ultrasono-graphic examination of the tuber calcanei area: Technique and normal ultrasonographic images. Equine Vet Educ 2020; 34(4). doi: 10.1111/eve.13403.
- Coudry V, Denoix JM. Ultrasonographic examination of the palmar aspect of the pastern of the horse: Digital flexor tendons and digital sheath. Equine Vet Educ 2012; 25(4): 196-203.
- Meagher DM, Aldrete AV. Lateral luxation of the superficial digital flexor tendon from the calcaneal tuber in two horses. J Am Vet Med Assoc 1989; 195(4): 495-498.
- Reiners S, Jann H, Gillis E. Repair of medial luxation of the superficial digital flexor tendon in the pelvic limb of a filly. Equine Pract 2000; 22(6): 18-21.
- Scott EA. Surgical repair of a dislocated superficial digital flexor tendon and fractured fibular tarsal bone in a horse. J Am Vet Med Assoc 1983; 183(3): 332-333.
- Maoudifard M. Principles of ultrasonography of tendons and ligaments in the horse. In Proceedings: 2ndISVS and 7th Kerman, Iran 2008; 72-81.
- Federici M, Fürst AE, Hoey S, et al. Outcome of conservative and surgical treatment for luxations of the equine superficial digital flexor tendon from the calcaneal tuber . Equine Vet Educ 2017; 31(1): 49-56.
- Lean NE, Ahern BJ. Permanent surgical luxation of the superficial digital flexor tendon in the management of a case of chronic septic calcaneal osteomyelitis. Vet Rec Case Rep 2022; 10(3): e424. doi: 10.1002/vrc2.424.
- Jordana M, Wilderjans H, Boswell J, et al. Outcome after lacerations of the superficial and deep digital flexor tendons, suspensory ligament and/or distal sesamoidean ligaments in 106 horses. Vet Surg 2011;40(3): 277-283.
- Cender AN, Mählmann K, Ehrle A, et al. Diagnosis and outcome following tenoscopic surgery of the digital flexor tendon sheath in German sports and pleasure horses. Equine Vet J 2023; 55(1): 48-58.
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