Viskjer et al: Surgical management of luxation of the superficial digital flexor muscle tendon (SDFT) using a modified block recession calcaneoplasty without subsequent tarsal joint immobilization
Veterinary Surgery 4, 2026

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

🔍 Key Findings

  • Modified block recession calcaneoplasty restored full clinical function in all dogs (11 limbs in 9 dogs) at long-term follow-up.
  • Objective gait function improved significantly, with symmetry index improving from 0.20 ± 0.13 preoperatively to 0.05 ± 0.03 at long-term follow-up (p = .03).
  • No routine postoperative tarsal immobilization was used, yet stable tendon positioning and excellent outcomes were achieved in most cases.
  • Overall complication rate was 45%, including 18% major complications requiring revision surgery and 27% minor complications.
  • Only one reluxation occurred, secondary to fracture of an overly narrow medial calcaneal wall; successful revision prevented further recurrence.
  • CT confirmed persistent deepening of the calcaneal groove and uneventful healing with variable osseous remodeling at long-term follow-up.
  • Ultrasonography demonstrated normalization of tendon fiber architecture at long-term evaluation despite heterogeneous appearance in many tendons at 6 weeks.
  • Most dogs were Shetland Sheepdogs (8/9), supporting breed predisposition, and all luxations were lateral.

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Viskjer et al: Surgical management of luxation of the superficial digital flexor muscle tendon (SDFT) using a modified block recession calcaneoplasty without subsequent tarsal joint immobilization
Veterinary Surgery 4, 2026

🔍 Key Findings

  • Modified block recession calcaneoplasty restored full clinical function in all dogs (11 limbs in 9 dogs) at long-term follow-up.
  • Objective gait function improved significantly, with symmetry index improving from 0.20 ± 0.13 preoperatively to 0.05 ± 0.03 at long-term follow-up (p = .03).
  • No routine postoperative tarsal immobilization was used, yet stable tendon positioning and excellent outcomes were achieved in most cases.
  • Overall complication rate was 45%, including 18% major complications requiring revision surgery and 27% minor complications.
  • Only one reluxation occurred, secondary to fracture of an overly narrow medial calcaneal wall; successful revision prevented further recurrence.
  • CT confirmed persistent deepening of the calcaneal groove and uneventful healing with variable osseous remodeling at long-term follow-up.
  • Ultrasonography demonstrated normalization of tendon fiber architecture at long-term evaluation despite heterogeneous appearance in many tendons at 6 weeks.
  • Most dogs were Shetland Sheepdogs (8/9), supporting breed predisposition, and all luxations were lateral.

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Multiple Choice Questions on this study

In Viskjer 2026 et al., on SDFT luxation surgery, how did the long-term symmetry index compare with preoperative values?

A. It worsened significantly
B. It remained unchanged
C. It improved from 0.20 ± 0.13 to 0.05 ± 0.03
D. All dogs became perfectly symmetrical with a value of 0
E. It improved only in dogs with bilateral disease

Answer: It improved from 0.20 ± 0.13 to 0.05 ± 0.03

Explanation: Long-term objective gait analysis demonstrated significantly improved limb symmetry compared with preoperative values (p=.03).
In Viskjer 2026 et al., on SDFT luxation surgery, what major complication resulted in reluxation of the tendon?

A. Failure of bursal imbrication
B. Common calcanean tendon mineralization
C. Fracture of the medial calcaneal wall after an overly narrow osteotomy
D. Implant-associated infection
E. Progressive tendon degeneration

Answer: Fracture of the medial calcaneal wall after an overly narrow osteotomy

Explanation: The only reluxation occurred when the medial wall fractured because insufficient bone remained after recession creation.
In Viskjer 2026 et al., on SDFT luxation surgery, which breed represented the majority of affected dogs in the study?

A. Border Collie
B. Golden Retriever
C. Shetland Sheepdog
D. Labrador Retriever
E. German Shepherd Dog

Answer: Shetland Sheepdog

Explanation: Eight of the nine dogs included in the study were Shetland Sheepdogs, supporting previous reports of breed predisposition.
In Viskjer 2026 et al., on SDFT luxation surgery, which postoperative management strategy was intentionally omitted in most cases?

A. External skeletal fixation
B. Calcaneotibial screw placement
C. Tarsal joint immobilization with rigid coaptation
D. Physical rehabilitation
E. NSAID administration

Answer: Tarsal joint immobilization with rigid coaptation

Explanation: A major goal of the study was to challenge the perceived need for postoperative tarsal immobilization.
In Viskjer 2026 et al., on SDFT luxation surgery, what was the primary objective of performing a modified block recession calcaneoplasty?

A. To increase gastrocnemius tendon tension
B. To deepen the calcaneal groove and improve tendon containment
C. To shorten the superficial digital flexor tendon
D. To fuse the talocrural joint
E. To remove inflamed bursal tissue

Answer: To deepen the calcaneal groove and improve tendon containment

Explanation: The technique was designed to create a deeper sulcus for stable tendon seating and reduce recurrence risk.

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