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Effect of Tibial Plateau Leveling Osteotomy on Patellar Tendon Angle: A Radiographic Cadaveric Study
Author(s) -
Drygas Kevin A.,
Pozzi Antonio,
Goring Robert L.,
Horodyski MaryBeth,
Lewis Daniel D.
Publication year - 2010
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2010.00665.x
Subject(s) - medicine , cadaveric spasm , cruciate ligament , radiography , patellar ligament , nuclear medicine , plateau (mathematics) , tendon , orthodontics , surgery , patellar tendon , anterior cruciate ligament , mathematical analysis , mathematics
Objectives: To determine the effect of tibial plateau leveling osteotomy (TPLO) on patellar tendon angle (PTA) in dogs. Study Design: Cadaveric radiographic study. Animals: Pelvic limb pairs (n=5) obtained from skeletally mature dogs, weighing 22–36 kg. Methods: TPLO was performed using a radiolucent jig that allowed for plateau segment rotation to a tibial plateau angle (TPA) of 15°, 6°, and 0°. Before, and at each of the prescribed rotations, PTA was measured by the tibial plateau (PTA TP ) and common tangent (PTA CT ) methods with the stifle positioned at 135° of flexion. Linear regression analysis was performed to evaluate the correlation between TPA and PTA. Results: At a mean (±SD) TPA of 5.9±0.7°, mean±SD PTA TP and PTA CT were 94.1±1.6° and 86.8±2.5°, respectively. A linear correlation was observed between TPA and PTA TP (r=0.85) and between TPA and PTA CT (r=0.61). Based on the regression equation of TPA and PTA CT , a TPA of 12° corresponded to a PTA CT of ∼90°. Conclusion: TPLO to a TPA of 6° reduces PTA to values similar to those recommended when performing tibial tuberosity advancement in dogs with cranial cruciate ligament insufficiency. Clinical Relevance: TPLO may neutralize tibial thrust by modifying PTA as well as decreasing TPA. TPLO to a TPA of 6° may not be necessary to neutralize the cranial tibial thrust according to the plateau rotation based on PTA CT measurement.