Orthopedics

A Practitioner’s Guide to Fracture Management, Part 1: Diagnosing Fractures & Choosing a Fixation Technique

A Practitioner’s Guide to Fracture Management, Part 1: Diagnosing Fractures & Choosing a Fixation Technique
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Meredith Kapler, DVM
North Carolina State University

David Dycus, DVM, MS, Diplomate ACVS (Small Animal)
Veterinary Orthopedic & Sports Medicine Group, Annapolis Junction, Maryland

Fractures occur commonly in both dogs and cats. While typically fractures occur after a traumatic incident, such as being hit by a car or falling from a height, some fractures occur following a pathologic weakening of the bone, which is seen with certain neoplastic conditions, such as osteosarcoma.

Since fractures are frequently seen in general practice, it is important for veterinarians to understand fracture biomechanics as well as how to:

  • Classify and diagnose fractures
  • Choose the correct fixation to ensure proper bone healing
  • Identify bone healing
  • Address complications, if they occur.

In Part 1 of this 2-part series, fracture biomechanics, fracture classification and diagnosis, and factors to consider when selecting a fixation technique are discussed. In Part 2, selection of fixation technique and specific techniques, identification of bone healing, and potential complications will be addressed.

Wolff’s law—a theory developed by German anatomist and surgeon Julius Wolff—states that bone in a healthy person or animal will adapt to the loads under which it is placed or, more simply, bone adapts to pressure, or a lack of it.

FRACTURE BIOMECHANICS

Bone is an amazing tissue with complex properties that allow it to adapt to its environment but typically conserve its general structure and shape. By following Wolff’s law, bone adapts and changes in areas of high stress, while minimizing changes in areas of low stress. Basically, bone is shaped for the greatest strength while, at the same time, minimizing bone mass that would contribute to increased weight of the animal.

Qualities of Bone

Bone is considered both viscoelastic and anisotropic:

  • The viscoelastic property of bone states that the strength of bone depends on the rate upon which it is loaded. For example, bone is stronger when it is loaded rapidly versus slowly (ie, the more rapidly bone is loaded, the more inflexible it becomes). This property is advantageous because most injuries are inflicted by impact with high loading rate forces. Therefore, fewer fractures actually occur because the more rapidly bone is stressed, the stiffer it becomes. However, once any bone reaches a failure point of loading, it will fracture.1
  • The anisotropic nature of bone suggests that bone strength is dependent on the direction in which it is loaded. For example, bone is stronger when loaded longitudinally versus transversely, which explains why bone is more likely to fracture with sudden high impact placed transversely upon the bone.

Fracture Forces

Bone is subject to many forces; a fracture occurs when the sum of these forces exceeds the ultimate strength of the bone. Therefore, understanding the forces placed upon bone is crucial to counteracting these forces when stabilizing a fracture.

Level 5 Head Example

The 5 main forces that act on bone are listed in Table 1.

  • Tensile (tension) forces act to lengthen the bone, while compressive forces shorten the bone.
  • Shearing forces are typically parallel or tangential to the bone, while torsional forces act to twist bone about its long axis.
  • Bending forces create a convex side of the bone (bone loaded in tension on the convex side) and a concave side (bone loaded in compression on the concave side). Bending forces are typically referred to as moments.

Table 1

FRACTURE DIAGNOSIS & CLASSIFICATION

Patient Stabilization

Because most fractures result from trauma, it is important to ensure patient stability prior to focusing on the fracture. Ideally, for any patient that presents after a traumatic event:

  1. Check and stabilize vitals (temperature, pulse quality and heart rate, respiration rate, blood pressure, pulse oximetry), if needed.
  2. Perform thorough physical, orthopedic, and neurologic examinations.
  3. Pursue initial diagnostics, including blood analysis, thoracic and abdominal radiographs, and an AFAST ultrasound.
  4. Resolve any life-threatening issues, which means that surgery may need to be delayed for several days due to conditions, such as pulmonary contusions or hypovolemia.
  5. Administer proper analgesia as soon as possible: Ideal analgesics are pure mu opioids, such as:
    • Morphine: Dogs, 0.5 to 2 mg/kg; cats, 0.05 to 0.4 mg/kg; IV or IM Q 6 to 8 H
    • Hydromorphone: Dogs/cats, 0.05 to 0.2 mg/kg IV or IM Q 6 to 8 H
    • Oxymorphone: Dogs/cats, 0.05 to 0.2 mg/kg IV or IM Q 6 to 8 H
    • Methadone: Dogs, 0.05 to 0.3 mg/kg; cats, 0.1 up to 0.3 mg/kg; IV or IM Q 6 to 8 H
    • Fentanyl: Dogs/cats, 2 mcg/kg loading dose followed by 2 to 10 mcg/kg/H CRI (caution with cats).

Other opioids, such as butorphanol, do not typically provide adequate analgesia.

Bone is stronger when loaded rapidly versus slowly, and when loaded longitudinally versus transversely. Therefore, bone is stiffer and stronger when loaded rapidly and longitudinally.

Post Stabilization Diagnostics

Once the patient is deemed stable:

  1. Obtain a thorough history: It is important to separate traumatic from pathologic fractures by determining the cause of the fracture, such as hit by car or fall from a height.
  2. Evaluate physical examination findings: Signs of fractures include pain, swelling, reluctance to bear weight, crepitus, and/or angulation deformities.
  3. If the patient is nonambulatory on the affected limb, perform a complete neurologic examination to rule out any neurologic defects, such as:
    • Radial nerve damage—seen with distal humeral fractures
    • Sciatic nerve damage—seen with ilial fractures.

Radiographs are the mainstay for determining fracture type and location. Key radiographic projections are orthogonal views, including lateral, craniocaudal, and oblique (if needed) views.

If only a lateral view is taken, some fractures, such as T-Y humeral fractures that involve both the articular surface of the distal humeral condyle and the supracondylar region, will be missed (Figure 1).

 

Figure 1A   Figure 1B

FIGURE 1. Lateral radiograph of the antebrachium in a young dog presenting for right forelimb lameness; this radiograph does not reveal any evidence of fracture or pathology (A). Craniocaudal radiograph of the same right forelimb, revealing a Salter Harris IV fracture of the distal humeral condyle (B).

 

Fracture Classification

To improve communication between veterinarians and clients, and between veterinarians themselves, fractures must be correctly identified and classified.

Fractures are initially classified by anatomic location, such as articular, physeal, epiphyseal, metaphyseal, or diaphyseal (Figure 2). Certain fractures are further subclassified based on anatomic locations, such as condylar, supracondylar, trochanteric, or subtrochanteric.

Based on radiographs, fractures are classified by severity, such as:

  • Incomplete: Fracture through only one cortex
  • Complete: Fracture through both cortices
  • Comminuted: Multiple fragments (Figure 3)
  • Segmental: Two or more separate fractures.

The term compound fracture is no longer used for fracture classification.

Typical fracture patterns consist of:

  • Transverse: Fracture is perpendicular to axis of the bone and is the diameter of the bone
  • Oblique: Fracture is diagonal to axis of the bone
    • Short oblique: Fracture is < 2× the diameter of the bone
    • Long oblique: Fracture is > 2× the diameter of the bone (Figure 4).
  • Spiral: Oblique fracture with a twist
  • Avulsion: Fractures classified as either:
    • Enthesis: Fracture at attachment of a joint capsule
    • Apophysis: Fracture at origin or insertion of a tendon or ligament; an example of an apophysis fracture is an olecranon fracture (Figure 5)
  • Growth plate: See Salter Harris Fractures.
Figure 2

FIGURE 2. Anatomic classification of long bones helps describe fracture location.

 

Figure 3A   Figure 3B

FIGURE 3. Lateral radiograph of mid-diaphyseal right comminuted femoral fracture due to trauma associated with a bullet (A). Craniocaudal radiograph of same femoral fracture (B). When both views are compared, caudoproximal and medial displacement can be seen. Note markers indicating right or left are not present; they were cropped out for magnification purposes, but should always be included in radiographs.
Figure 4

FIGURE 4. Classification of transverse, short oblique, and long oblique fractures of a femur.

 

FIGURE 5. An olecranon fracture is an example of an apophysis fracture. In this radiograph, the pull of the triceps is causing proximal displacement of the fracture fragment (arrow). Fixation for this fracture would involve counteracting the force of the triceps, such as a tension band fixation.

FIGURE 5. An olecranon fracture is an example of an apophysis fracture. In this radiograph, the pull of the triceps is causing proximal displacement of the fracture fragment (arrow). Fixation for this fracture would involve counteracting the force of the triceps, such as a tension band fixation.

 

Displacement should also be recognized when classifying fractures; full orthogonal radiographs are needed to fully characterize displacement. This property is based on the degree of displacement of the distal segment in relation to the proximal segment. An example is caudoproximal displacement, which is seen with most distal diaphyseal femoral fractures.

Further classification of fractures should incorporate level of contamination—whether the fracture is closed (intact skin) or open. Open fractures are further subclassified as:

  • Type I: < 1 cm puncture; fragment briefly penetrated the skin
  • Type II: > 1 cm puncture; external trauma
  • Type III: Extensive wound; soft tissues damaged or absent. Further classified as:
    • Type IIIa: Adequate skin to close the wound
    • Type IIIb: Insufficient skin to close (“degloving injury”)
    • Type IIIc: Compromised vascular supply to the skin.

In summary, fracture classification provides an accurate description that is important when determining fixation approach (Table 2). For example, the fracture in Figure 7 is classified as a right closed mid-diaphyseal comminuted femoral fracture; there are multiple pieces but, in general, caudoproximal and medial displacement are present.

Salter Harris Fractures

Salter Harris fractures (SH) are growth plate (physeal) fractures in immature animals. They are classified based on the prognosis for continued physeal growth (with type I less likely and type VI more likely to have long-term effects on mature bone length):

  • SH I fracture: Involves a fracture through the physis itself (Figure 6)
  • SH II fracture: Involves the physis and extends into the metaphysis
  • SH III fracture: Involves the physis and extends into the epiphysis; considered an intra-articular fracture
  • SH IV fracture: Involves the physis and extends into both the metaphysis and epiphysis; considered an intra-articular fracture
  • SH V fracture: Compression fracture through the physis
  • SH VI fracture: Compression fracture through only a portion of the physis that typically results in angulation deformities after maturity.
Figure 6

FIGURE 6. Salter Harris I fracture of the proximal right humeral growth plate.

Figure 7

FIGURE 7. Example of a right closed mid-diaphyseal comminuted femoral fracture, with caudoproximal and medial displacement. This fracture is considered comminuted because there is only one fracture location with more than 2 pieces. If there were 2 fractures in the bone—both proximally and distally (ie, more than one fracture in the bone)—then it would be considered segmental.

Table 2

FIXATION FACTORS

Several options exist for fracture stabilization, and several factors must be considered when deciding on an appropriate fixation method:

  • Patient factors: Size, age, weight, breed, activity level
  • Client factors: Finances, compliance, husbandry
  • Fracture factors: Configuration, location, forces, contamination
  • Veterinarian factors: Understanding of biomechanics and healing, knowledge of particular implants, implant availability.

The goal is to select the appropriate fixation method for each individual fracture based on these described factors. For example, even though an intramedullary pin set and cerclage wires are available, this does not mean that every fracture should receive this fixation.

In addition, when we approach fixation selection, we always evaluate the list of fixation methods (Table 3), pros and cons of each method, and previously described factors. In addition, we determine whether all the opposing forces (Table 1) can be counteracted with a particular fixation method.

Table 3

WHEN TO REFER

An important concern when addressing fractures is to understand when to refer the patient to an orthopedic surgeon, based on consideration of the type of fracture, patient comorbidities, availability of appropriate fixation techniques, client resources, and the practitioner’s experience.

SH = Salter Harris

References

  1. Cross AR. Chapter 41: Fracture biology and biomechanics. In Tobias KM, Johnston SA (eds): Veterinary Surgery: Small Animal, 1st ed. Philadelphia: Elsevier, 2012.

 

Meredith KaplerMeredith Kapler, DVM, is a small animal surgical resident at North Carolina State University. She has presented at the Veterinary Orthopedic Society Conference, instructs veterinary students, and contributed to research articles and a book chapter. She received her DVM from University of Tennessee, completed a small animal internship at Virginia–Maryland Regional College of Veterinary Medicine, and completed an orthopedic research fellowship at University of Tennessee. Upon completing her residency, she will work as a staff surgeon at Veterinary Specialty Hospital of the Carolinas.

 

David DycusDavid Dycus, DVM, MS, Diplomate ACVS (Small Animal), is a staff orthopedic surgeon at the Veterinary Orthopedic & Sports Medicine Group (VOSM) just outside Washington, D.C. He has presented at national meetings and has lectured second- through fourth-year veterinary students. He has published an array of research articles and a book chapter. Dr. Dycus received his DVM from Mississippi State University, completed a rotating internship at Auburn University, and completed an MS and small animal surgical residency at Mississippi State University.

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value='Honduras' >Honduras</option><option value='Hong Kong' >Hong Kong</option><option value='Hungary' >Hungary</option><option value='Iceland' >Iceland</option><option value='India' >India</option><option value='Indonesia' >Indonesia</option><option value='Iran' >Iran</option><option value='Iraq' >Iraq</option><option value='Ireland' >Ireland</option><option value='Isle of Man' >Isle of Man</option><option value='Israel' >Israel</option><option value='Italy' >Italy</option><option value='Jamaica' >Jamaica</option><option value='Japan' >Japan</option><option value='Jersey' >Jersey</option><option value='Jordan' >Jordan</option><option value='Kazakhstan' >Kazakhstan</option><option value='Kenya' >Kenya</option><option value='Kiribati' >Kiribati</option><option value='Kuwait' >Kuwait</option><option value='Kyrgyzstan' >Kyrgyzstan</option><option value='Lao People&#039;s Democratic Republic' >Lao People&#039;s Democratic Republic</option><option value='Latvia' >Latvia</option><option value='Lebanon' >Lebanon</option><option value='Lesotho' >Lesotho</option><option value='Liberia' >Liberia</option><option value='Libya' >Libya</option><option value='Liechtenstein' >Liechtenstein</option><option value='Lithuania' >Lithuania</option><option value='Luxembourg' >Luxembourg</option><option value='Macau' >Macau</option><option value='Macedonia' >Macedonia</option><option value='Madagascar' >Madagascar</option><option value='Malawi' >Malawi</option><option value='Malaysia' >Malaysia</option><option value='Maldives' >Maldives</option><option value='Mali' >Mali</option><option value='Malta' >Malta</option><option value='Marshall Islands' >Marshall Islands</option><option value='Martinique' >Martinique</option><option value='Mauritania' >Mauritania</option><option value='Mauritius' >Mauritius</option><option value='Mayotte' >Mayotte</option><option value='Mexico' >Mexico</option><option value='Micronesia' >Micronesia</option><option value='Moldova' >Moldova</option><option value='Monaco' >Monaco</option><option value='Mongolia' >Mongolia</option><option value='Montenegro' >Montenegro</option><option value='Montserrat' >Montserrat</option><option value='Morocco' >Morocco</option><option value='Mozambique' >Mozambique</option><option value='Myanmar' >Myanmar</option><option value='Namibia' >Namibia</option><option value='Nauru' >Nauru</option><option value='Nepal' >Nepal</option><option value='Netherlands' >Netherlands</option><option value='New Caledonia' >New Caledonia</option><option value='New Zealand' >New Zealand</option><option value='Nicaragua' >Nicaragua</option><option value='Niger' >Niger</option><option value='Nigeria' >Nigeria</option><option value='Niue' >Niue</option><option value='Norfolk Island' >Norfolk Island</option><option value='North Korea' >North Korea</option><option value='Northern Mariana Islands' >Northern Mariana Islands</option><option value='Norway' >Norway</option><option value='Oman' >Oman</option><option value='Pakistan' >Pakistan</option><option value='Palau' >Palau</option><option value='Palestine, State of' >Palestine, State of</option><option value='Panama' >Panama</option><option value='Papua New Guinea' >Papua New Guinea</option><option value='Paraguay' >Paraguay</option><option value='Peru' >Peru</option><option value='Philippines' >Philippines</option><option value='Pitcairn' >Pitcairn</option><option value='Poland' >Poland</option><option value='Portugal' >Portugal</option><option value='Puerto Rico' >Puerto Rico</option><option value='Qatar' >Qatar</option><option value='Réunion' >Réunion</option><option value='Romania' >Romania</option><option value='Russia' >Russia</option><option value='Rwanda' >Rwanda</option><option value='Saint Barthélemy' >Saint Barthélemy</option><option value='Saint Helena' >Saint Helena</option><option value='Saint Kitts and Nevis' >Saint Kitts and Nevis</option><option value='Saint Lucia' >Saint Lucia</option><option value='Saint Martin' >Saint Martin</option><option value='Saint Pierre and Miquelon' >Saint Pierre and Miquelon</option><option value='Saint Vincent and the Grenadines' >Saint Vincent and the Grenadines</option><option value='Samoa' >Samoa</option><option value='San Marino' >San Marino</option><option value='Sao Tome and Principe' >Sao Tome and Principe</option><option value='Saudi Arabia' >Saudi Arabia</option><option value='Senegal' >Senegal</option><option value='Serbia' >Serbia</option><option value='Seychelles' >Seychelles</option><option value='Sierra Leone' >Sierra Leone</option><option value='Singapore' >Singapore</option><option value='Sint Maarten' >Sint Maarten</option><option value='Slovakia' >Slovakia</option><option value='Slovenia' >Slovenia</option><option value='Solomon Islands' >Solomon Islands</option><option value='Somalia' >Somalia</option><option value='South Africa' >South Africa</option><option value='South Georgia' >South Georgia</option><option value='South Korea' >South Korea</option><option value='South Sudan' >South Sudan</option><option value='Spain' >Spain</option><option value='Sri Lanka' >Sri Lanka</option><option value='Sudan' >Sudan</option><option value='Suriname' >Suriname</option><option value='Svalbard and Jan Mayen Islands' >Svalbard and Jan Mayen Islands</option><option value='Sweden' >Sweden</option><option value='Switzerland' >Switzerland</option><option value='Syria' >Syria</option><option value='Taiwan' >Taiwan</option><option value='Tajikistan' >Tajikistan</option><option value='Tanzania' >Tanzania</option><option value='Thailand' >Thailand</option><option value='Timor-Leste' >Timor-Leste</option><option value='Togo' >Togo</option><option value='Tokelau' >Tokelau</option><option value='Tonga' >Tonga</option><option value='Trinidad and Tobago' >Trinidad and Tobago</option><option value='Tunisia' >Tunisia</option><option value='Turkey' >Turkey</option><option value='Turkmenistan' >Turkmenistan</option><option value='Turks and Caicos Islands' >Turks and Caicos Islands</option><option value='Tuvalu' >Tuvalu</option><option value='Uganda' >Uganda</option><option value='Ukraine' >Ukraine</option><option value='United Arab Emirates' >United Arab Emirates</option><option value='United Kingdom' >United Kingdom</option><option value='United States' >United States</option><option value='Uruguay' >Uruguay</option><option value='US Minor Outlying Islands' >US Minor Outlying Islands</option><option value='Uzbekistan' >Uzbekistan</option><option value='Vanuatu' >Vanuatu</option><option value='Venezuela' >Venezuela</option><option value='Vietnam' >Vietnam</option><option value='Virgin Islands, British' >Virgin Islands, British</option><option value='Virgin Islands, U.S.' >Virgin Islands, U.S.</option><option value='Wallis and Futuna' >Wallis and Futuna</option><option value='Western Sahara' >Western Sahara</option><option value='Yemen' >Yemen</option><option value='Zambia' >Zambia</option><option value='Zimbabwe' 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