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Simple and Economical Method to Create Thoracolumbar Burst Fracture in a Calf Spine Model.

Sekharappa V, Sait A - Asian Spine J (2016)

Bottom Line: Computed tomography scan analysis of the fractures revealed McCormack grade 2 and grade 3 fractures in 5 and 3 specimens, respectively, Dennis type 2B in 4, type 2A burst fractures in 5 specimens and fracture dislocation in 1 specimen, AO type A3.1.1 in 4 specimens, type A3.2.2 in 4 and type A3.3.3 in 2 specimens.Vertical laminar split fracture was seen in 6 specimens.Average acceleration and energy at impact was 9.04 m/sec and 54.24 Nm, respectively.

View Article: PubMed Central - PubMed

Affiliation: Spinal Disorder Surgery Unit, Department of Orthopaedics, Christian Medical College, Vellore, India.

ABSTRACT

Study design: Calf spine model study.

Purpose: To describe a technique of creating thoracolumbar burst fractures in calf spine model by low weight drop weight.

Overview of literature: Burst fractures are one of the commonest types of thoracolumbar fractures and their treatment is controversial. Biomechanical studies aid in the decision of treatment of these fractures. A simple method of creation of burst fractures would help these biomechanical studies.

Methods: Ten specimens of thoracolumbar spines harvested from 6-8 week old calves were weakened at the target vertebra by standardized osteotomy cuts. Burst fractures were created by dropping a 5-kg of weight from a height of 1.2 m using an in-house device. An accelerometer attached to the weight measured the acceleration at the point of impact.

Results: Average weight and bone mineral density of the specimens was 390 g and 0.67 g/cm(2), respectively. Computed tomography scan analysis of the fractures revealed McCormack grade 2 and grade 3 fractures in 5 and 3 specimens, respectively, Dennis type 2B in 4, type 2A burst fractures in 5 specimens and fracture dislocation in 1 specimen, AO type A3.1.1 in 4 specimens, type A3.2.2 in 4 and type A3.3.3 in 2 specimens. Vertical laminar split fracture was seen in 6 specimens. Average acceleration and energy at impact was 9.04 m/sec and 54.24 Nm, respectively.

Conclusions: We describe a technique to create thoracolumbar burst fractures in calf spine by a drop weight method using a device that is simple to operate and easy to construct. The method is consistent and produces fractures similar to those occurring naturally, and can be considered as an alternative method for creating burst fractures in biomechanical studies.

No MeSH data available.


Related in: MedlinePlus

Diagram showing standardized osteotomy cuts through the upper end plate and upper half of the vertebral body.
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Figure 3: Diagram showing standardized osteotomy cuts through the upper end plate and upper half of the vertebral body.

Mentions: The night before testing, the specimens were thawed in normal saline. Upper and lower vertebra were mounted on dental cement and moulded into cup shapes. The index vertebra was weekend using a 1-cm wide osteotome. The cuts were standardized to all specimens. Three cuts were made: two were anterior posterior and one was medio-lateral through the upper end plate. The cuts divided the upper half of the body and upper end plate into six segments. The anterior posterior cuts extended into the posterior cortex, as confirmed by a sensation of giving way. Posterior elements remained undisturbed (Fig. 3).


Simple and Economical Method to Create Thoracolumbar Burst Fracture in a Calf Spine Model.

Sekharappa V, Sait A - Asian Spine J (2016)

Diagram showing standardized osteotomy cuts through the upper end plate and upper half of the vertebral body.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4764542&req=5

Figure 3: Diagram showing standardized osteotomy cuts through the upper end plate and upper half of the vertebral body.
Mentions: The night before testing, the specimens were thawed in normal saline. Upper and lower vertebra were mounted on dental cement and moulded into cup shapes. The index vertebra was weekend using a 1-cm wide osteotome. The cuts were standardized to all specimens. Three cuts were made: two were anterior posterior and one was medio-lateral through the upper end plate. The cuts divided the upper half of the body and upper end plate into six segments. The anterior posterior cuts extended into the posterior cortex, as confirmed by a sensation of giving way. Posterior elements remained undisturbed (Fig. 3).

Bottom Line: Computed tomography scan analysis of the fractures revealed McCormack grade 2 and grade 3 fractures in 5 and 3 specimens, respectively, Dennis type 2B in 4, type 2A burst fractures in 5 specimens and fracture dislocation in 1 specimen, AO type A3.1.1 in 4 specimens, type A3.2.2 in 4 and type A3.3.3 in 2 specimens.Vertical laminar split fracture was seen in 6 specimens.Average acceleration and energy at impact was 9.04 m/sec and 54.24 Nm, respectively.

View Article: PubMed Central - PubMed

Affiliation: Spinal Disorder Surgery Unit, Department of Orthopaedics, Christian Medical College, Vellore, India.

ABSTRACT

Study design: Calf spine model study.

Purpose: To describe a technique of creating thoracolumbar burst fractures in calf spine model by low weight drop weight.

Overview of literature: Burst fractures are one of the commonest types of thoracolumbar fractures and their treatment is controversial. Biomechanical studies aid in the decision of treatment of these fractures. A simple method of creation of burst fractures would help these biomechanical studies.

Methods: Ten specimens of thoracolumbar spines harvested from 6-8 week old calves were weakened at the target vertebra by standardized osteotomy cuts. Burst fractures were created by dropping a 5-kg of weight from a height of 1.2 m using an in-house device. An accelerometer attached to the weight measured the acceleration at the point of impact.

Results: Average weight and bone mineral density of the specimens was 390 g and 0.67 g/cm(2), respectively. Computed tomography scan analysis of the fractures revealed McCormack grade 2 and grade 3 fractures in 5 and 3 specimens, respectively, Dennis type 2B in 4, type 2A burst fractures in 5 specimens and fracture dislocation in 1 specimen, AO type A3.1.1 in 4 specimens, type A3.2.2 in 4 and type A3.3.3 in 2 specimens. Vertical laminar split fracture was seen in 6 specimens. Average acceleration and energy at impact was 9.04 m/sec and 54.24 Nm, respectively.

Conclusions: We describe a technique to create thoracolumbar burst fractures in calf spine by a drop weight method using a device that is simple to operate and easy to construct. The method is consistent and produces fractures similar to those occurring naturally, and can be considered as an alternative method for creating burst fractures in biomechanical studies.

No MeSH data available.


Related in: MedlinePlus