Septic tendonitis of the deep digital flexor tendon in a Thoroughbred horse referred for weight loss and intermittent fever
Authors: Santinelli I., Beccati F., Passamonti F., Pepe M.
Journal: Equine Veterinary Education
Summary
# Editorial Summary: Septic Tendonitis in a Young Thoroughbred A 3-year-old Thoroughbred gelding presented with a four-month history of intermittent fever and progressive weight loss, followed by acute lameness, which diagnostic imaging revealed to be septic tendonitis and tenosynovitis of the deep digital flexor tendon caused by *Streptococcus equi* subspecies *zooepidemicus*—an organism also recovered from the lower respiratory tract, suggesting systemic dissemination. Rather than pursuing surgical debridement and tenorrhaphy despite the severe lesion and guarded prognosis, the owners elected aggressive multimodal antimicrobial therapy delivered via systemic, regional, and local routes, combined with anti-inflammatory medication. Against expectations, the gelding returned to competitive racing within 20 months post-discharge and subsequently completed 20 races in full work, demonstrating that carefully escalated medical management alone can occasionally achieve functional recovery in selected cases of equine septic flexor tendon disease. This outcome, whilst exceptional, suggests that conservative treatment warrants consideration when surgery is declined, particularly where combined systemic and local drug delivery is feasible; however, the long-term soundness of medically managed septic tendons remains poorly characterised and warrants further investigation to establish realistic prognostic parameters.
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Practical Takeaways
- •Consider deep digital flexor tendon infection in horses presenting with prolonged weight loss and fever even before lameness becomes evident; early diagnosis is critical.
- •While surgery is typically recommended for septic tendonitis, aggressive medical management with combined systemic and local antimicrobial therapy may be an alternative option in selected cases where surgical access or prognosis is limited.
- •Recovery to full athletic function is possible with septic tendonitis of the DDFT, but requires intensive treatment, careful monitoring, and realistic timeframes of several months for rehabilitation.
Key Findings
- •Septic tendonitis of the deep digital flexor tendon caused by Streptococcus equi ssp. zooepidemicus can present with chronic constitutional signs (weight loss, fever) preceding acute lameness.
- •Aggressive multimodal antimicrobial therapy (systemic, local, and regional) combined with anti-inflammatory medication achieved return to athletic function without surgical intervention in this case.
- •At 20 months post-discharge, the affected horse successfully returned to racing and completed 20 races, demonstrating potential for functional recovery despite severe septic tendonitis.