21 Questions
What is the function of the patella in the stifle joint?
To stabilize the extensor mechanism alignment with the femoral shaft and trochlear groove
Which muscles are part of the extensor apparatus of the stifle joint?
Rectus femoris, Vastus medialis, lateralis, intermedius
What is the clinical significance of patella luxation in cats?
It often presents bilaterally in cats
What is the most common form of patella luxation in cats?
Medial patella luxation (MPL)
Which breed is commonly reported to be predisposed to patella luxation?
Abyssinian
What is the overall complication rate for surgical treatment of patella luxation?
13-40%
What type of patella luxation is more common in cats, bilateral or unilateral?
Bilateral
Which type of patella luxation is more common in dogs and cats?
Medial patella luxation (MPL)
What type of patients benefit from surgical treatment of patella luxation?
Clinically symptomatic patients
What is the association between patella luxation and hip luxation in cats?
Approximately 58%
What is the recommended postoperative activity restriction period for patients undergoing surgical treatment for patella luxation?
6-8 weeks
Which type of patella luxation is more common in small breed dogs?
Medial patella luxation (MPL)
What is the range of the clinical grading system for patella luxation?
Grade I to Grade IV
What is a characteristic of extensor malalignment in medial patella luxation (MPL)?
Femur deformities
What does the diagnosis of patella luxation involve?
Orthopedic examination, stability tests for CrCL tears, and diagnostic imaging such as radiography
What is included in the orthopedic examination for patella luxation?
Palpation for luxation, assessment of CrCL stability, and examination maneuvers for MPL and LPL
What is trochleoplasty?
A surgical procedure to correct a shallow trochlear groove
What is tibial tuberosity transposition used for in the surgical treatment of patella luxation?
Correcting patella luxation and addressing underlying contributing factors
What is the aim of surgical procedures for patella luxation?
Addressing the underlying contributing factors, such as shallow trochlear groove and concurrent angular limb deformities
What are the types of trochleoplasty techniques mentioned in the text?
Recession trochleoplasty, abrasion trochleoplasty, and trochlear chondroplasty
What does traumatic patella luxation involve?
Tears in the retinaculum
Study Notes
Patella Luxation in Dogs: Diagnosis and Surgical Treatment
- Patella luxation is classified as medial (MPL) or lateral (LPL) and can be non-traumatic, traumatic, or iatrogenic
- MPL is more common in small breed dogs, while LPL is more common in large breed dogs
- Extensor malalignment in MPL is characterized by femur deformities, shallow trochlear groove, and genu varum
- Traumatic patella luxation involves tears in the retinaculum, while non-traumatic luxation leads to retinaculum fibrosis
- The clinical grading system for patella luxation ranges from grade I (patella resides in the groove) to grade IV (permanently luxated and cannot be manually reduced)
- Concurrent abnormalities associated with patella luxation include cranial cruciate ligament (CrCL) tear and angular deformities
- Diagnosis of patella luxation involves orthopedic examination, stability tests for CrCL tears, and diagnostic imaging such as radiography
- Orthopedic examination includes palpation for luxation, assessment of CrCL stability, and examination maneuvers for MPL and LPL
- Surgical treatment for patella luxation is grade and symptom-based and may involve trochleoplasty, tibial tuberosity transposition, and soft tissue adjustments
- Trochleoplasty techniques include recession trochleoplasty, abrasion trochleoplasty, and trochlear chondroplasty, with variations in surgical procedures
- Tibial tuberosity transposition is a common surgical technique to correct patella luxation, addressing underlying contributing factors
- Surgical procedures aim to address the underlying contributing factors, such as shallow trochlear groove and concurrent angular limb deformities
Test your knowledge of patella luxation in dogs with this quiz on diagnosis and surgical treatment. Learn about the classification, concurrent abnormalities, clinical grading system, diagnostic methods, and various surgical techniques for addressing this common orthopedic issue in canines.
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