Premium
Effect of Cranial Tibial Closing Wedge Angle on Tibial Subluxation: An Ex Vivo Study
Author(s) -
Apelt Detlef,
Pozzi Antonio,
MarcellinLittle Denis J.,
Kowaleski Michael P.
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.2010.00670.x
Subject(s) - medicine , cruciate ligament , tibia , radiography , subluxation , nuclear medicine , knee joint , orthodontics , anatomy , surgery , anterior cruciate ligament , alternative medicine , pathology
Objective: To evaluate the effect of cranial tibial wedge osteotomy (CTWO) angle on cranial tibial subluxation (CTS) and postoperative tibial plateau angle (TPA). Study Design: Ex vivo biomechanical study. Sample Population: Canine pelvic limbs (n=6). Methods: TPA determined from a lateral radiographic projection. CTS under 30% body weight load was measured from radiographs in the intact limb and after transection of the cranial cruciate ligament. A CTWO equal to TPA+10° was performed at the distal extent of the tibial crest, and was stabilized with a custom designed hinge plate and external skeletal fixator. TPA and CTS in the loaded limb was determined from radiographs at 4 CTWO angles: TPA−5°, TPA, TPA+5°, and TPA+7.5°. Comparison of CTS between the intact limb and the 4 CTWO angle groups was performed using 1‐way repeated‐measures ANOVA and a Dunnett multiple comparison test (significance at P <.05). Results: CTS was significantly greater than that of the intact limb in the TPA−5° and TPA groups. CTS was not significantly different from the intact limb in the TPA+5° or TPA+7.5° groups with corresponding TPAs of 5.9° and 3.8°, respectively. Conclusion: Using this model, CTS was neutralized at a TPA of ∼4–6° with a CTWO angle between TPA+5° and TPA+7.5°. Clinical Relevance: A CTWO angle between TPA+5° and TPA+7.5° is necessary to neutralize CTS and achieve a postoperative TPA of 4–6° if the CTWO is performed at the distal extent of the tibial crest and the caudal cortices are aligned.