Abstract
Study Design. In vitro human cadaveric biomechanical study. Objective. The objective was to evaluate and compare the construct stability of occiput-C1-C2 fixation provided by C0-C1 transarticular screws or occipital condyle screws. Summary of Background Data. The placement of an occipital plate is commonly recommended in occipitocervical fixation surgery. However, there are unique clinical situations in which the placement of the occipital plate may not be possible or may have already failed. For these situations, 2 novel techniques that use the occipital condyle have been recently introduced: (1) C0-C1 transarticular screws fixation and (2) direct occipital condyle screws and C1 lateral mass screws fixation. However, there is a lack of thorough biomechanics studies of these techniques. Methods. Nondestructive kinematic tests and destructive tests were conducted in 16 fresh frozen cadaveric spines. As a nondestructive kinematic test, a pure moment of up to 2.0 N•m was applied in smooth continuous flexion/extension, lateral bending, and axial rotation motions. In addition to an intact-state case, a total of 5 different constructs (standard occipital plate, C0-C1 transarticular screws with/without occipital plate, and occipital condyle screws with/without occipital plate) were tested after destabilization of C0-C1 and C1-C2. All constructs had C2 pedicle screws fixation, and occipital condyle screws were incorporated with C1 lateral screws. Results. All fixation techniques significantly reduced ranges of motion compared with the intact state. In comparison with the standard occipital plate construct, the 2 novel techniques showed higher stability in axial rotation and lower stability in lateral bending. In both nondestructive and destructive tests, there were no statistical differences between C0-C1 transarticular screw construct and occipital condyle screw construct. Conclusion: The C0-C1 transarticular screw technique and direct occipital condyle screw with C1 lateral mass screw technique can be salvage fixation methods when occipital plate fixation is not feasible.
| Original language | English |
|---|---|
| Journal | Spine |
| Volume | 37 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - May 20 2012 |
| Externally published | Yes |
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Keywords
- biomechanics
- C0-C1 transarticular screw
- direct occipital condyle screw
- occipital condyle
- occipitocervical fi xation
ASJC Scopus subject areas
- Clinical Neurology
- Orthopedics and Sports Medicine
Cite this
Biomechanical comparison of occiput-C1-C2 fixation techniques : C0-C1 transarticular screw and direct occiput condyle screw. / Takigawa, Tomoyuki; Simon, Peter; Orías, Alejandro A Espinoza; Hong, Jae Taek; Ito, Yasuo; Inoue, Nozomu; An, Howard S.
In: Spine, Vol. 37, No. 12, 20.05.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Biomechanical comparison of occiput-C1-C2 fixation techniques
T2 - C0-C1 transarticular screw and direct occiput condyle screw
AU - Takigawa, Tomoyuki
AU - Simon, Peter
AU - Orías, Alejandro A Espinoza
AU - Hong, Jae Taek
AU - Ito, Yasuo
AU - Inoue, Nozomu
AU - An, Howard S.
PY - 2012/5/20
Y1 - 2012/5/20
N2 - Study Design. In vitro human cadaveric biomechanical study. Objective. The objective was to evaluate and compare the construct stability of occiput-C1-C2 fixation provided by C0-C1 transarticular screws or occipital condyle screws. Summary of Background Data. The placement of an occipital plate is commonly recommended in occipitocervical fixation surgery. However, there are unique clinical situations in which the placement of the occipital plate may not be possible or may have already failed. For these situations, 2 novel techniques that use the occipital condyle have been recently introduced: (1) C0-C1 transarticular screws fixation and (2) direct occipital condyle screws and C1 lateral mass screws fixation. However, there is a lack of thorough biomechanics studies of these techniques. Methods. Nondestructive kinematic tests and destructive tests were conducted in 16 fresh frozen cadaveric spines. As a nondestructive kinematic test, a pure moment of up to 2.0 N•m was applied in smooth continuous flexion/extension, lateral bending, and axial rotation motions. In addition to an intact-state case, a total of 5 different constructs (standard occipital plate, C0-C1 transarticular screws with/without occipital plate, and occipital condyle screws with/without occipital plate) were tested after destabilization of C0-C1 and C1-C2. All constructs had C2 pedicle screws fixation, and occipital condyle screws were incorporated with C1 lateral screws. Results. All fixation techniques significantly reduced ranges of motion compared with the intact state. In comparison with the standard occipital plate construct, the 2 novel techniques showed higher stability in axial rotation and lower stability in lateral bending. In both nondestructive and destructive tests, there were no statistical differences between C0-C1 transarticular screw construct and occipital condyle screw construct. Conclusion: The C0-C1 transarticular screw technique and direct occipital condyle screw with C1 lateral mass screw technique can be salvage fixation methods when occipital plate fixation is not feasible.
AB - Study Design. In vitro human cadaveric biomechanical study. Objective. The objective was to evaluate and compare the construct stability of occiput-C1-C2 fixation provided by C0-C1 transarticular screws or occipital condyle screws. Summary of Background Data. The placement of an occipital plate is commonly recommended in occipitocervical fixation surgery. However, there are unique clinical situations in which the placement of the occipital plate may not be possible or may have already failed. For these situations, 2 novel techniques that use the occipital condyle have been recently introduced: (1) C0-C1 transarticular screws fixation and (2) direct occipital condyle screws and C1 lateral mass screws fixation. However, there is a lack of thorough biomechanics studies of these techniques. Methods. Nondestructive kinematic tests and destructive tests were conducted in 16 fresh frozen cadaveric spines. As a nondestructive kinematic test, a pure moment of up to 2.0 N•m was applied in smooth continuous flexion/extension, lateral bending, and axial rotation motions. In addition to an intact-state case, a total of 5 different constructs (standard occipital plate, C0-C1 transarticular screws with/without occipital plate, and occipital condyle screws with/without occipital plate) were tested after destabilization of C0-C1 and C1-C2. All constructs had C2 pedicle screws fixation, and occipital condyle screws were incorporated with C1 lateral screws. Results. All fixation techniques significantly reduced ranges of motion compared with the intact state. In comparison with the standard occipital plate construct, the 2 novel techniques showed higher stability in axial rotation and lower stability in lateral bending. In both nondestructive and destructive tests, there were no statistical differences between C0-C1 transarticular screw construct and occipital condyle screw construct. Conclusion: The C0-C1 transarticular screw technique and direct occipital condyle screw with C1 lateral mass screw technique can be salvage fixation methods when occipital plate fixation is not feasible.
KW - biomechanics
KW - C0-C1 transarticular screw
KW - direct occipital condyle screw
KW - occipital condyle
KW - occipitocervical fi xation
UR - http://www.scopus.com/inward/record.url?scp=84861528894&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84861528894&partnerID=8YFLogxK
U2 - 10.1097/BRS.0b013e3182436669
DO - 10.1097/BRS.0b013e3182436669
M3 - Article
C2 - 22158063
AN - SCOPUS:84861528894
VL - 37
JO - Spine
JF - Spine
SN - 0362-2436
IS - 12
ER -