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| Author(s): |
Rebeca Bastos Abibe
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Botucatu. 2021-12-10. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Medicina Veterinária e Zootecnia. Botucatu |
| Defense date: | 2021-10-19 |
| Advisor: | Sheila Canevese Rahal |
| Abstract | |
This study aimed to evaluate the semitendinosus tendon to replace ligamentum teres (LT) with the toggle technique, using rabbits as an experimental model. Twenty-six Norfolk rabbits with approximately 3 months of age were divided into two equitable groups: G1 - no reconstruction of LT and capsulorrhaphy; G2 - reconstruction of the LT using semitendinosus tendon autograft. In both groups, the LT was removed from the right hip joint. In G2 the autograft was harvested from the left hind limb. The rabbits were evaluated before surgery (M1) and 48 hours (M2), 15 days (M3), 30 days (M4), and 90 days (M5) after surgery. The rabbits supported their limbs on the ground in both groups. The thigh circumference showed differences with G1>G2, except in M2. No significant differences were observed between groups for passive hip range of motion at M5. In the radiographic evaluation of G1, four hip joint subluxations were seen, three at M4 and one at M5. In G2, two hip joint luxations at M3 and one subluxation at M4 were seen. The toggle rod pulled back through the acetabular hole was associated with the luxations and subluxation. Irregular articular surfaces were seen on ultrasonography in four rabbits in each group at M5. Gross evaluation identified tendon graft integrity in 76.92% of the rabbits. Histological analysis revealed graft adhesion to the bone in the early phase comprised of Sharpey-like collagen fibers. In conclusion, the double-bundle reconstruction of the LT using autologous semitendinosus tendon associated with the toggle rod showed an early phase of tendon graft ligamentization at 90 days post-operatively in young rabbits, but biomechanical bias suffered by the tendon during gait motion must be considered. (AU) | |
| FAPESP's process: | 19/14711-2 - Ligamentum teres reconstruction using tendinous autograft |
| Grantee: | Rebeca Bastos Abibe |
| Support Opportunities: | Scholarships in Brazil - Master |