TY - JOUR
T1 - Range of motion after thoracolumbar corpectomy
T2 - evaluation of analogous constructs with a novel low-profile anterior dual-rod system and a traditional dual-rod system
AU - Gehrchen, Martin
AU - Hegde, Sajan K
AU - Moldavsky, Mark
AU - Chinthukunta, Suresh
AU - Gudipally, Manasa
AU - Bucklen, Brandon
AU - Salloum, Kanaan
AU - Khalil, Saif
PY - 2017/3/1
Y1 - 2017/3/1
N2 - Study design: An in vitro biomechanical study. Objectives: To compare the biomechanical stability of traditional and low-profile thorocolumbar anterior instrumentation after a corpectomy with cross-connectors. Summary of background data: Dual-rod anterior thoracolumbar lateral plates (ATLP) have been used clinically to stabilize the thorocolumbar spine. Methods: The stability of a low-profile dual-rod system (LP DRS) and a traditional dual-rod system (DRS) was compared using a calf spine model. Two groups of seven specimens were tested intact and then in the following order: (1) ATLP with two cross-connectors and spacer; (2) ATLP with one cross-connector and spacer; (3) ATLP with spacer. Data were normalized to intact (100 %) and statistical analysis was used to determine between-group significances. Results: Both constructs reduced motion compared to intact in flexion–extension and lateral bending. Axial rotation motion became unstable after the corpectomy and motion was greater than intact, even with two cross-connectors with both systems. Relative to their respective intact groups, LP DRS significantly reduced motion compared to analogous DRS in flexion–extension. The addition of cross-connectors reduced motion in all loading modes. Conclusions: The LP DRS provides 7.5 mm of reduced height with similar biomechanical performance. The reduced height may be beneficiary by reduced irritation and impingement on adjacent structures.
AB - Study design: An in vitro biomechanical study. Objectives: To compare the biomechanical stability of traditional and low-profile thorocolumbar anterior instrumentation after a corpectomy with cross-connectors. Summary of background data: Dual-rod anterior thoracolumbar lateral plates (ATLP) have been used clinically to stabilize the thorocolumbar spine. Methods: The stability of a low-profile dual-rod system (LP DRS) and a traditional dual-rod system (DRS) was compared using a calf spine model. Two groups of seven specimens were tested intact and then in the following order: (1) ATLP with two cross-connectors and spacer; (2) ATLP with one cross-connector and spacer; (3) ATLP with spacer. Data were normalized to intact (100 %) and statistical analysis was used to determine between-group significances. Results: Both constructs reduced motion compared to intact in flexion–extension and lateral bending. Axial rotation motion became unstable after the corpectomy and motion was greater than intact, even with two cross-connectors with both systems. Relative to their respective intact groups, LP DRS significantly reduced motion compared to analogous DRS in flexion–extension. The addition of cross-connectors reduced motion in all loading modes. Conclusions: The LP DRS provides 7.5 mm of reduced height with similar biomechanical performance. The reduced height may be beneficiary by reduced irritation and impingement on adjacent structures.
KW - Animals
KW - Biomechanical Phenomena
KW - Cattle
KW - Lumbar Vertebrae/surgery
KW - Models, Animal
KW - Prostheses and Implants
KW - Range of Motion, Articular
KW - Thoracic Vertebrae/surgery
U2 - 10.1007/s00586-015-3966-2
DO - 10.1007/s00586-015-3966-2
M3 - Journal article
C2 - 25917825
SN - 0940-6719
VL - 26
SP - 666
EP - 670
JO - European Spine Journal
JF - European Spine Journal
IS - 3
ER -