Surgical management of luxation of the superficial digital flexor muscle tendon (SDFT) using a modified block recession calcaneoplasty without subsequent tarsal joint immobilization.

Modified block recession calcaneoplasty effectively treats SDFT luxation without postoperative immobilization.

This prospective observational study evaluated a modified block recession calcaneoplasty technique for treating superficial digital flexor tendon (SDFT) luxation in dogs without postoperative tarsal joint immobilization. Eleven surgeries were performed in nine client-owned dogs with SDFT luxation and no concurrent disease. The procedure aimed to alter calcaneal tuberosity morphology to prevent recurrent luxation while eliminating the need for joint immobilization. Follow-up assessments at 6 weeks and 12 months included pressure-sensitive walkway analysis, ultrasonography, and computed tomography. Results demonstrated significant clinical improvement, with symmetry index improving from 0.20±0.13 preoperatively to 0.05±0.03 at 12 months (p=0.03). All limbs achieved full function at long-term follow-up. Five complications occurred (45% overall): two major complications requiring revision surgery and three minor complications that resolved without intervention. Notably, no recurrent luxations occurred except one case involving calcaneal tuberosity fracture, which was successfully revised without subsequent reluxation. The authors conclude that this modified technique represents a viable complement to existing surgical methods for treating canine SDFT luxation, offering improved functional outcomes without necessitating tarsal joint immobilization.

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