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Related Concept Videos

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

298
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
298
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

233
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
233
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

254
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
254

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Magnetically Controlled Growing Rods Graduation: Deformity Control with High Complication Rate.

David Eduard Lebel1, Brett Rocos1, Ilkka Helenius2

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Spine
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Magnetically controlled growing rods (MCGR) offer comparable spine deformity control to traditional growing rods (TGR) in growing spines. However, MCGR treatment is associated with a high rate of complications, including metallosis and unplanned surgeries.

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Area of Science:

  • Orthopedics
  • Spine Surgery
  • Pediatric Orthopedics

Background:

  • Magnetically controlled growing rods (MCGR) are increasingly used for growing spine deformities, but long-term data are limited.
  • This study investigates the long-term efficacy and complications of MCGR compared to traditional growing rods (TGR).

Purpose of the Study:

  • To evaluate the long-term experience with magnetically controlled growing rods (MCGR) in treating growing spine deformities up to final posterior spine fusion.
  • To compare the effectiveness of MCGR with traditional growing rods (TGR) regarding deformity correction and spinal growth.

Main Methods:

  • A multicenter retrospective review of 47 patients treated with MCGR between 2011 and 2017.
  • Patients were followed for an average of 50 months, with data collected on deformity correction, spinal growth, and complications.

Main Results:

  • MCGR achieved initial coronal deformity correction from 69.6° to 40°, with some progression to 52.8° before final fusion.
  • Thoracic spine height increased significantly, but metallosis (47%) and overall complications (66%) were frequent.
  • Unplanned surgeries occurred in 45% of patients, correlated with thoracic kyphosis >40°.

Conclusions:

  • MCGR provides adequate control of growing spine deformities, comparable to TGR.
  • High rates of overall and implant-related complications necessitate careful consideration of MCGR use.