Whitney ME, Butler JR, Dycus DL, Teer LB, Elder SH, Priddy LB, Wills RW. Ex vivo biomechanical comparison of four Center of Rotation Angulation Based Leveling Osteotomy fixation methods.
Vet Surg 2021;
51:157-162. [PMID:
34453449 DOI:
10.1111/vsu.13696]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 06/27/2021] [Accepted: 07/20/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVE
To compare the strength of four constructs used to secure an osteotomy in a Center of Rotation Angulation (CORA)-Based Leveling Osteotomy (CBLO) in an ex vivo model.
STUDY DESIGN
Ex vivo study.
SAMPLE POPULATION
Thirty-two canine tibiae from 17 skeletally mature cadavers weighing between 18 and 33.2 kg.
METHODS
Thirty-two paired tibiae with patella and patellar tendon were collected. Each tibia was randomly allocated to a construct group: plate and pin (Plate), plate with countersink compression screw (HCS), plate with tension band (TB), or plate with HCS and TB (HCSTB). Samples were loaded by distraction until failure. The stiffness, yield load, and ultimate load were compared between each fixation method.
RESULTS
No difference in stiffness of the constructs was detected between groups (p = .6937). Yield load for the HCSTB group (1211.06 N) was greater than the TB group (1016.41 N), the HCS group (907.20 N), and the Plate group (787.73 N) (p = .0069). The ultimate load for the HCSTB group (1387.82 N) was greater than the TB group (1076.36 N), HCS group (926.62 N), and the Plate group (774.35 N) (p = .0004).
CONCLUSIONS
CBLO fixation augmented with a TB and HCS provided a stronger construct that withstood a greater yield load and ultimate load than either augmentation strategy alone.
CLINICAL SIGNIFICANCE
Augmenting a CBLO fixation with a TB and a HCS can provide increased construct strength.
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