Common calcaneal tendon rupture: plantigrade stance
8-year-old Dobermann, 38 kg, with a 2-month lameness and progressively plantigrade stance of the left hind limb; on weight bearing the toes flex (a 'crab claw' posture). There is thickening of the common calcaneal tendon proximal to its insertion, with no previous wound.
Which statement about diagnosis and treatment is correct?
chevron_right Show answer and explanation
A. It indicates complete rupture of all components of the tendon; the treatment is pantarsal arthrodesis
If all components were ruptured, the toes would not flex. Arthrodesis is a salvage procedure when repair fails, not the first option.
B. It indicates rupture of the gastrocnemius tendon with an intact superficial digital flexor: surgical repair and immobilisation of the tarsus in extension (calcaneotibial screw, external fixator or splint) for about 6 weeks
Correct. The intact superficial digital flexor tightens as the tarsus flexes and flexes the toes. The degenerate tendon is debrided and sutured (for example, with a pulley pattern), protecting the repair with immobilisation and gradual removal.
C. It can be treated with a soft bandage and NSAIDs alone, as chronic lesions heal by themselves
In chronic lesions with a plantigrade stance, elongated scar tissue does not regain function without surgery, and the stance usually worsens.
D. After suturing the tendon, immediate free weight bearing is advisable to avoid adhesions
The tendon suture cannot withstand unprotected weight-bearing loads; without immobilisation the repair elongates or fails.
lightbulb Key takeaway
Chronic degenerative calcaneal tendon injuries are typical of middle-aged large-breed dogs such as Dobermanns and Labradors. Ultrasound helps define which components are affected. Recovery is long (months) and requires controlled rehabilitation.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.