Summary
Objective: To assess functional outcome in dogs with cranial cruciate ligament (CrCL) disease
after tibial tuberosity advancement (TTA) using force plate gait analysis, and to
evaluate parameters potentially influencing outcome. Study design: Prospective clinical study. Animals: Consecutive clinical patients (n=37) with CrCL-deficient stifles (n=40). Methods: The stifle joints were examined arthroscopically prior to TTA. Meniscal release was
not performed if the medial meniscus was intact. Open medial arthrotomy and partial
meniscectomy were performed in the presence of meniscal tears. Vertical ground reaction
forces were measured preoperatively and at follow-up examinations four to 16 months
postoperatively (mean: 5.9 months). The ground reaction forces of a group of 65 healthy
dogs were used for the comparison. The potential effects of clinical parameters on
functional outcome were evaluated statistically. Results: Complete CrCL rupture was identified in 28 joints, and partial CrCL rupture in 12
joints. The medial meniscus was damaged in 21 stifles. Vertical ground reaction forces
were significantly higher at follow-up (P<0.01), but remained significantly lower
than those of control dogs (P<0.01). Complications were identified in 25% of joints,
and the dogs with complications had significantly lower peak vertical forces at follow-up
than the dogs without complications (P=0.04). Other clinical parameters did not influence
outcome. Conclusions: Tibial tuberosity advancement significantly improved limb function in dogs with CrCL
disease, but did not result in complete return to function. Complications adversely
affected functional outcome. Clinical significance: A return to a function of approximately 90% of normal can be expected in dogs with
CrCL disease undergoing TTA.
Keywords
Stifle - tibial tuberosity advancement - cranial cruciate ligament - force plate gait
analysis - function