Start with the conclusion
Rupture of the Achilles (calcaneal) tendon needs surgical assessment and repair. After repair, strict activity restriction is usually required for 6–12 weeks, supported by external coaptation (splint, brace or external fixator) to protect the repair. Earlier treatment tends to give a better functional outcome — research suggests that dogs repaired within 21 days of injury may do better.
Typical signs — seek care promptly
- Collapse of the hock (tarsus) with inability to support the limb normally.
- Swelling, pain and a palpable dimple in the calcaneal region.
- Plantigrade stance — the foot flat, the hock dropped.
- Sudden lameness or complete inability to bear weight.
- A history of trauma: a cut, a bite, an impact, or a sudden explosive effort during exercise.
Why the tendon ruptures
Common mechanisms include:
- Laceration or bite: the tendon is cut through after the skin is broken.
- Chronic overload: repeated over-stretching leading to degenerative rupture.
- Athletic injury: instantaneous overload during a hard jump or an abrupt stop.
Some cases are partial tears, which are more subtle and are easily mistaken for a sprain.
Why it has to be managed surgically
The Achilles tendon transmits the push-off force of the lower limb. Once it is ruptured, the joint loses active support and external fixation alone cannot bring the tendon to a load-bearing state. Clinical approaches include:
- Tendon suture repair (several techniques are used).
- Protection with an external fixator or external coaptation (splint or brace).
- Staged, progressive weight-bearing plans after surgery.
Post-operative management: where the real test is
① Strict activity restriction for 6–12 weeks
This is the most important — and most often underestimated — part of post-operative care. Too-early activity can cause the repair to fail or the tendon to rupture again.
② External protection
A splint, brace or external fixator is commonly used after surgery to limit joint motion and protect the repair. Device type, fixation angle and change schedule are decided by the surgical team.
③ Rechecks and progressive loading
Rechecks usually cover the repair site, device fit and skin, and whether the case can move to the next rehabilitation stage.
④ Watching skin and the device
During prolonged external coaptation, skin problems (pressure marks, dampness, infection) are common complications and need daily checking.
The role of braces and external fixation here
- Role: post-operative protective fixation is part of the treatment plan — limiting joint motion and protecting the repair.
- Limit: a brace does not replace surgery and must not be used on a suspected Achilles rupture without surgical assessment.
- Key point: fixation angle, wear duration and recheck rhythm must be set by the surgical team.
Sources
- ACVS — Achilles' Tendon Injuries (6–12 weeks of strict activity restriction after repair)
- PubMed — Outcome following surgical repair of Achilles tendon rupture (better outcome when repaired within 21 days)
- dvm360 — Management of Achilles tendon rupture in the small animal patient