Pelvic Fracture

The long bones in dogs and cats closely resemble the bones in human arms and legs. Pets can fracture these bones for many reasons, including being hit by a vehicle, fights with other animals, and certain sports-related injuries.

Limb anatomy

Front limb/foot

• Front feet: phalanges (toes; three bones per toe)
• metacarpal bones (hand; four main bones)
• carpal bones (wrist)
• Forearm: radius and ulna
• Upper arm: humerus and scapula (shoulder blade)

Back limb/foot

• Back feet: phalanges (toes; same as front feet)
• metatarsal bones (foot; four main bones)
• tarsal bones (hock/ankle)
• Lower leg: tibia (shin bone) and fibula
• Thigh: femur
• Pelvis: ilium, acetabulum (hip socket), ischium

Joints

• carpus (wrist): small carpal bones + radius
• elbow: radius + ulna + humerus
• shoulder: humerus + scapula
• tarsus (ankle): small tarsal bones + tibia
• stifle (knee): tibia + femur
• hip: femur + pelvis (acetabulum)

A bone can break in many patterns; these breaks are called fractures. To plan treatment, veterinary surgeons group fractures into categories.

• Incomplete: more like bending/cracking; the bone is only partially disrupted around its circumference; most often in young animals (Figure 1).
• Complete: the break extends through the entire circumference and produces two or more fragments (Figure 2).

Complete fractures are also described by their shape:

• Transverse: straight across the bone at a right angle to its length
• Oblique: diagonal break producing two pointed fragments
• Comminuted: three or more fragments of different shapes (Figure 3)

A fracture that creates an open skin wound is an open fracture. This may happen when bone penetrates the skin from inside-out, or when an external object enters through the skin and breaks the bone. If there is no open wound near the break, it is a closed fracture. Open fractures are considered more urgent because infection risk is higher.

Figure captions

• Figure 1: Incomplete radial fracture in a dog.
• Figure 2: Complete fractures of the right radius and ulna in an adult dog.
• Figure 3: Comminuted tibial fracture in an adult dog.

Most fractures cause obvious, severe lameness. Many pets will hold the limb up entirely, though some may still place partial weight depending on the fracture’s location and type. With major trauma (such as a vehicle strike or fall from height), pets may have more than one fractured limb and may be unable or unwilling to walk. Swelling, pain, and abnormal motion at the site may be noticed.

When trauma is the cause, other life-threatening injuries can also occur. Abdominal trauma may lead to hemorrhage and ruptured organs (such as the urinary bladder). Chest trauma can cause pulmonary contusions (lung bruising with hemorrhage), bleeding around the lungs, and air around the lungs from a lung tear. These critical problems can delay definitive fracture repair.

A primary care or emergency veterinarian will perform a thorough assessment to look for additional injuries to vital organs. X-rays of the injured area are commonly recommended. Many pets require pain medication and/or sedation to obtain diagnostic images. Other early tests may include full bloodwork, abdominal and thoracic (chest) radiographs, and possibly an abdominal ultrasound. In some situations, a whole-body trauma CT scan may be advised.

Figure 4: External fixation used for the tibial fracture shown in Figure 3.
Figure 5: Plate-and-screw internal fixation of the radial and ulnar fractures shown in Figure 2.
Figure 6: Femoral fracture stabilized using an interlocking nail, bolts, and multiple cerclage wires.

Initial management

When a bone breaks, early priority is immobilization so fragments cannot move. Immobilization reduces pain and helps prevent sharp bone ends from further injuring nearby muscles, nerves, and blood vessels.

Before reaching a clinic, you should confine your pet to a very small area. Ideally, the pet stays lying down in a box, crate, or kennel, with movement limited only for toileting and hygiene. Seek veterinary care as soon as possible (at minimum, call for instructions). Fractures are extremely painful and other dangerous conditions may have occurred at the same time. Do not give medications or apply treatments unless your veterinarian clearly instructs you to.

Timing guidance:

• Closed fractures: ideally treated within 2–4 days.
• Open fractures: best handled with an initial cleaning procedure of wound and bone within 8 hours of injury; definitive surgery can be postponed 24–48 hours.

Temporary immobilization is often achieved with a splint. Effective immobilization requires restricting movement of the joints above and below the broken bone. This is relatively straightforward for fractures below the elbow and below the knee, but fractures of the upper arm or thigh are harder because the shoulder and hip are difficult to splint. For upper arm or thigh fractures, veterinarians commonly recommend strict confinement while arranging definitive care. Splints, bandages, and confinement are safest when managed in a veterinary facility.

Fracture repair

Once broken, a bone cannot withstand the usual forces placed on it during walking, such as:

• bending (like snapping a pencil)
• torsion (twisting)
• compression (weight-bearing forces from gravity)
• traction (pulling from muscles at their attachment sites)

Healthy bone normally resists these forces; fractures occur when external force exceeds bone strength. After a fracture, the bone must be stabilized enough to heal correctly. Common stabilization options include:

• External coaptation: splints or casts placed outside the limb; strong against bending and moderately effective against torsion and compression.
• External fixation: surgically placed pins go into bone and exit through skin; pins attach to a rigid external bar with clamps to stabilize the bone (Figure 4). Excellent resistance to bending, compression, and torsion.
• Internal fixation: implants placed within the bone or on its surface—plates, screws, nails, pins, wires (Figures 5 and 6)—with performance varying by device and force type.

Treatment planning depends on multiple factors, each of which can make healing easier or more difficult. These factors guide the best option for the individual pet. Referral to an ACVS board-certified veterinary surgeon may be recommended because successful fracture fixation requires specific training and experience.

Fracture scale for repair decisions

Easy fracture healing vs Difficult fracture healing

Factor 1: The patient

• Easy: young; quiet/calm; healthy/eating; small/medium/large size; single-limb injury
• Difficult: old; very active/bouncy; sick/debilitated; giant or toy size; additional injuries

Factor 2: The fracture

• Easy: closed; low-impact; transverse
• Difficult: open; high-impact; comminuted

Factor 3: The environment

• Easy: close supervision; restricted activity
• Difficult: minimal supervision; freely active

You may have several repair choices. Your surgeon will help match the approach to your home environment, time commitment, and possible financial constraints. A splint/cast is not automatically the simplest or least expensive option: these often require frequent rechecks and bandage changes, and complications can prolong healing. Some fixation techniques reduce the need for intensive postoperative care and can increase the likelihood of a successful outcome. Owner participation in decision-making supports better results.

As a general principle, follow all instructions from your veterinary surgeon. Common guidance includes:

Bandage care

If your pet has a splint/cast as definitive treatment, or a postoperative bandage for swelling and pain control, close monitoring is essential. Even simple bandages can cause major problems. Contact your surgeon promptly if concerns arise.

• Watch for slipping, soiling, or damage from chewing. If the bandage shifts, gets wet, or loses structure, healing can be compromised and pressure sores may form. If position changes occur, call your veterinarian—replacement may be required.
• If the end is open, check the two central toenails twice daily. They should remain close together. If they spread apart, toe swelling is occurring and can lead to serious complications; the bandage should be assessed within 4–6 hours. Call immediately if swelling is seen.
• Keep bandages clean and dry. Use a plastic bag or boot over the bandage end every time the pet goes outdoors; remove it indoors. If the bandage becomes wet or develops a foul odor, it needs evaluation within 4–6 hours to prevent severe skin injury.
• Do not alter the bandage yourself. Adding tape or extra wrapping can be dangerous and compromise safety. If security or integrity is a concern, return to the clinic for reassessment and reapplication.
• Bandages and splints can cause serious complications despite being effective tools for pain control and healing. Because your pet cannot tell you the bandage is uncomfortable, you must watch closely for changes and seek help if anything seems wrong.

Activity restriction

Confinement is critical and should follow your surgeon’s plan. This often means limiting the pet to a carpeted area, a kennel, or a small room. Use baby gates to block slippery floors and stairs. No jumping on/off furniture; no playing, running, or jumping. Dogs should go outside on a short leash only for bathroom breaks. For cats, a large dog crate with food/water, bedding, and a litter pan often works best; a small room can also work, but remove furniture to prevent jumping.

Pets frequently feel ready to use the leg before the bone is healed. Maintain restrictions until healing is confirmed on x-rays—stopping too early can cause serious complications.

Assisting your pet

Some pets need help standing and walking for days to weeks after injury. Even if they can move independently, light support is often useful until stability is fully restored—especially on slippery floors or stairs. Dogs often accept assistance; cats typically do not. Some dogs may resist and refuse to move; adjust your approach to help without escalating stress. Some pets need strong support; others only need minimal help to prevent slipping or tipping.

Commercial sling-style products designed to help dogs walk during recovery are available online and are often easier to use than homemade options.

Physical therapy

Fractures affect more than bone: muscles, nerves, and blood vessels can be injured, causing pain and reduced function. If a limb is painful or weak, the pet avoids using it. Lack of use for days to weeks leads to joint stiffness, muscle loss (atrophy), and slower bone healing. Physical therapy aims to improve comfort and function without harming healing. Some basic methods can be done at home; more advanced techniques may be delivered by veterinary physical therapists with surgeon guidance. Good coordination between surgeon and therapist can support excellent outcomes and a faster return to normal function.

Simple home-based methods may include:

• Cold therapy: during the first week after injury, cold packs reduce inflammation, swelling, and pain, improving comfort and earlier limb use.
• Range-of-motion work: during the first month, gentle flexion/extension of joints in the injured limb helps preserve joint health while full use is limited. Initially, movement will be small; the goal is motion without pain. As healing progresses, stretching can gradually increase toward a more normal range.
• Massage: once the initial painful inflammatory phase has eased, massage of skin and muscles around the injury may be advised. This helps limit restrictive scar tissue formation and can provide intermediate-stage pain relief.

Bone healing depends on many of the same factors listed above. Younger animals generally heal faster than older ones. Fractures with extensive disruption of muscle and blood supply heal more slowly than those surrounded by healthier tissue. Repairs requiring minimal surgical trauma (no incision or small incision) typically heal faster than those involving greater surgical disruption.

Your surgeon should outline what to expect. As a broad guideline, fractures require at least 4 weeks to heal sufficiently in young puppies and about 8 weeks in adult or older animals before activity can begin progressing toward normal.

Because pets cannot reliably “take it easy,” owners must enforce restrictions even when the pet wants to run or play. Although the recovery period (often 2–3 months) can feel long, stressing the repair too early can cause a major setback. With attentive care, proper follow-up, and appropriate rehabilitation, most fractures heal well and limbs can return to near-normal shape and strength—allowing pets to resume fully normal lives.