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What are the metatarsal bones?

The metatarsal bones are the bones in the hind limb of the cat that connect the “ankle” (the tarsus) to the toes (the phalanges). There are five metatarsal bones on each limb, with the major weight bearing bones being the central metatarsal bones three and four.

What is a bone fracture?

A fracture of the bone is when the normal architecture of the bone is disrupted. This can occur due to a variety of reasons (trauma, disease, etc) and as such can present in a number of ways. Most commonly there will be complete fractures where a clean break is present, or comminuted fractures where there are multiple fragments of bone present.

Signs of metatarsal fractures

The most common signs that accompany a metatarsal fracture are if the cat suddenly became non-weight bearing in one of the hind limbs, often accompanied by a painful swelling in the distal limb.

Diagnosis of metatarsal fractures

In order for the veterinary surgeon to get a definitive diagnosis and formulate a proper treatment plan, x-rays under sedation will often be necessary to see the extent of the fractures.

Treatment options of metatarsal fractures

There are multiple treatment options available for the treatment of fractures of the metatarsal bones. Management of fractures can be non-surgical or surgical.

Non-surgical

Non-surgical treatment can be used when:

  • There is a fracture of a single metatarsal bone
  • When there is little displacement of the fractures (even of multiple bones)
  • Non-surgical treatment is often via splinting or cage rest alone with no dressing. With splinting/dressing the limb, complications are not uncommon and relate to soft tissue injury when the dressing slips. This can be severe if the blood supply is cut off to the foot. These dressing require diligent monitoring at home.

    Surgical

    Surgical treatment should be considered in the following:

    • When there is significant malalignment of the bones
    • When more than two metacarpal bones are involved
    • When there are open fractures.

    Several techniques for surgical treatment are available. These include:

    • Internal fixation
      • Plates and screws
        • These can be used for both simple and comminuted fractures
        • Cats may be too small for this to be an appropriate method of treatment due to the size of their metatarsal bones.
      • Intramedullary techniques
        • This is when a pin is placed down the centre of the fractured bones in order to improve alignment.
      • External skeletal fixation
        • This is when pins are placed into the bone, through the skin and held in place by an outer connecting bar
      • Combined intramedullary pinning and external skeletal fixation
        • This is where both intramedullary pins and external skeletal fixators are used. These may be indicated where there are multiple fractures present in the same bone (a comminuted fracture).
    Post-operative management

    Animals that undergo surgery to treat fractured metatarsals will need to be rested for as much as possible initially. Regular check-ups with the surgeon will be needed in order to assess how healing is going. X-rays may be needed in order to evaluate healing fracture and external skeletal fixator frames can be removed once adequate healing has occurred.

     

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