Felis ISSN 2398-2950

Patella: fracture

Contributor(s): Sorrel Langley-Hobbs, Rob Pettitt

Introduction

  • Rare.
  • Most commonly an atraumatic transverse stress fracture.
  • Less commonly fracture is secondary to trauma.
  • Types:
    • 1. Transverse mid-body fractures (stress fracture) Patella: transverse stress fracture - radiograph lateral .
    • 2. Small avulsion fractures with concurrent injury or disease (traumatic) Patella: fracture and luxation - radiograph lateral  Patella: fracture and luxation - radiograph CrCd  .
    • 3. Comminuted fractures (traumatic).
    • 4. Chronic non union fractures may be seen as incidental findings in older cats  Patella: chronic fracture - radiograph lateral  .
  • Signs: acute onset hindlimb lameness/non-weight-bearing, local swelling and pain.

Pathogenesis

Etiology

  • Stress fractures occur after minimal trauma.

Pathophysiology

  • The underlying etiology is not known but cats with stress fractures of the patella may have underlying bone disease. Owners should be warned that both patellae could fracture and other bones may fracture subsequently including the ischial tuberosity, acetabulum, humeral condyle, calcaneus and proximal tibia   Patella: fracture with calcaneal fracture - radiograph lateral  .

Timecourse

  • The contralateral patella fractures an average of 3 months after the first patella has fractured in other 50% of cats.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Hermer J, Bush M, Whiting C et al (2012) Healing of patella fractures in two kittens. Vet Comp Orthop Traumatol 25 (2), 155-159 PubMed.
  • Langley-Hobbs S J (2009) Survey of 52 fractures of the patella in 34 cats. Vet Rec 164 (3), 80-86 PubMed.
  • Langley-Hobbs S J, Ball S, McKee W M (2009) Transverse stress fracture of the proximal tibia in 10 cats with non-union chronic patella fractures. Vet Rec 164 (14), 425-430 PubMed.
  • Langley-Hobbs S J, Brown G, Matis U (2008) Traumatic fracture of the patella in 11 cats. Vet Comp Orthop Traumatol 21 (5), 427-433 PubMed.

Other sources of information

  • Montavon P M, Voss, K, Langley Hobbs S J (2009) Feline Orthopaedic Surgery and Musculoskeletal Disease. Elsevier/Saunders.


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