Limits...
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

Diagrammatic representation of the device used for creating burst fracture.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4764542&req=5

Figure 2: Diagrammatic representation of the device used for creating burst fracture.

Mentions: The device for creating the fracture was manufactured at a workshop using locally available materials. It consisted of a rectangular base measuring 0.61×0.61 m with two parallel cylindrical rods of 3.8 cm diameter welded to the base. The rods were cross connected on the top using a bar with a cylindrical ring in the center that would allow another cylindrical rod 3.8 cm in diameter. Through the central ring on the top cross bar, another cylindrical rod of 3.8 cm diameter was passed through and an hemispherical impactor was attached to the end. This central rod acted as a guide for dropping the weight. A 5-kg weight was allowed to freely glide through this central post and was kept at a height of 1.2 m using a cross pin. An accelerometer was attached to the weight to calculate the pre-impact acceleration (Fig. 2).


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

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

Diagrammatic representation of the device used for creating burst fracture.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Diagrammatic representation of the device used for creating burst fracture.
Mentions: The device for creating the fracture was manufactured at a workshop using locally available materials. It consisted of a rectangular base measuring 0.61×0.61 m with two parallel cylindrical rods of 3.8 cm diameter welded to the base. The rods were cross connected on the top using a bar with a cylindrical ring in the center that would allow another cylindrical rod 3.8 cm in diameter. Through the central ring on the top cross bar, another cylindrical rod of 3.8 cm diameter was passed through and an hemispherical impactor was attached to the end. This central rod acted as a guide for dropping the weight. A 5-kg weight was allowed to freely glide through this central post and was kept at a height of 1.2 m using a cross pin. An accelerometer was attached to the weight to calculate the pre-impact acceleration (Fig. 2).

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