3D‐Printed Screw‐Rod Auxiliary System for Unstable Atlas Fractures: A Retrospective Analysis

3D-Printed Screw-Rod Auxiliary System for Unstable Atlas Fractures: A Retrospective Analysis

10.21203/rs.3.rs-32827/v1 ◽

2020 ◽

Author(s):

Chao Wu ◽

Jiayan Deng ◽

Tao Li ◽

Jian Pan ◽

Haigang Hu ◽

...

Keyword(s):

Blood Loss ◽

Operation Time ◽

Auxiliary System ◽

Occipitocervical Fusion ◽

Fracture Displacement ◽

Significant Difference ◽

Post Operation ◽

3D Printed ◽

Atlas Fractures

Abstract Objective To develop and validate a 3D-printed screw-rod auxiliary system for unstable atlas fractures.Methods Fourteen patients who underwent occipitocervical fusion with the 3D-printed screw-rod auxiliary system enrolled in our hospital from 2017 to 2019 were reviewed. The operation time, blood loss and radiation times during the operation were recorded. The maximum fracture displacement values pre- and post-operation were measured based on CT imaging. All screw grades were evaluated after surgery. The O-C2 angle and OCI angle pre-operation, post-operation and at the last follow-up were measured. The dysphagia scale 3 and 12 months after surgery and the NDI 3 and 12 months after surgery were assessed.Results The average surgery time, average blood loss and average radiation times for the 14 patients were 112.14 minutes, 171.43 ml and 5.07 times, respectively. There was a significant difference in maximum fracture displacement between pre- and post-operation values (P<0.05). A total of 56 screws were inserted; 3 screws were classified as grade 1, and the others were classified as grade 0. There was a significant difference in the O-C2 and OCI angles from pre-operation values to values 3 days after the operation (P=0.002, P<0.05); there was no significant difference in the O-C2 or OCI angle from 3 days after the operation to the last follow-up (P=0.079; P=0.201). The dysphagia scales of two patients were assessed as mild 3 months after surgery, and the others were assessed as normal. All patients’ dysphagia scores returned to normal 12 months after surgery. The average NDI and average neck VAS scores 12 months after surgery were 2.53 and 8.41, respectively.Conclusion It is clinically feasible with the assistance of a screw-rod auxiliary system to perform occipitocervical fusion for unstable atlas fractures. This novel technique can objectively restore the occipitocervical angle of patients, and there are few postoperative complications.

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A Retrospective Analysis of System Engineering Data Collection Metrics for a 3D Printed UAS Design

Procedia Computer Science ◽

10.1016/j.procs.2019.05.049 ◽

2019 ◽

Vol 153 ◽

pp. 1-8

Author(s):

Simon W Miller ◽

Michael A Yukish ◽

Meghan E Hoskins ◽

Lorri A Bennett ◽

Eric J Little

Keyword(s):

Data Collection ◽

Retrospective Analysis ◽

System Engineering ◽

Engineering Data ◽

3D Printed

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Comparison of the 3D-printed operation guide template technique and the free-hand technique for S2-alar-iliac screw placement

BMC Surgery ◽

10.1186/s12893-020-00930-5 ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Yonghui Zhao ◽

Yulong Ma ◽

Jinlong Liang ◽

Haotian Luo ◽

Xingbo Cai ◽

...

Keyword(s):

Ct Scan ◽

Cortical Bone ◽

Retrospective Analysis ◽

Screw Placement ◽

Iliac Screw ◽

3D Printed ◽

Free Hand Technique ◽

Grade 3

Abstract Background To compare the safety and accuracy of the 3D-printed operation guide template technique and the free-hand technique in the placement of the S2-alar-iliac (S2AI) screw. Methods We conducted a retrospective analysis of 47 patients undergoing S2AI screw placement in our hospital, divided into the 3D-printed operation guide template group and the free-hand screw placement group. The duration of single S2AI screw placement was documented in all patients. A postoperative CT scan was performed to assess screw placement effectiveness according to the distance from the screw tip to the breach of the cortical bone wall. Results In total, 42 screws were placed in the guide template group, with an average screw placement duration of 151.6 ± 44.8 s. Screw placement grading was as follows: 40 screws in grade 0, two in grade 1, and none in grades 2 and 3. This grading resulted in excellent and good rates of 95.2% and 100%, respectively. In total, 52 screws were placed in the free-hand group, with an average screw placement duration of 138.3 ± 45.9 s. Screw placement grading was as follows: 42 screws in grade 0, seven in grade 1, three in grade 2, and none in grade 3. This grading resulted in excellent, good and acceptable rates 80.8%, 94.2% and 100%, respectively. Screw placement duration did not significantly differ between the groups (p > 0.05). The excellent rate of screw placement was greater in the guide template group than in the free-hand group (p < 0.05), but the good and acceptable rates did not significantly differ between the two groups (p > 0.05). Conclusion Both techniques can be applied to S2AI screw placement. The 3D-printed guide technique is superior to the free-hand technique in terms of safety and accuracy.

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Combined 3D Printed Template to Guide Iliosacral Screw Insertion for Sacral Fracture and Dislocation: A Retrospective Analysis

Orthopaedic Surgery ◽

10.1111/os.12620 ◽

2020 ◽

Vol 12 (1) ◽

pp. 241-247

Author(s):

Chao Wu ◽

Jia‐yan Deng ◽

Tao Li ◽

Lun Tan ◽

De‐chao Yuan

Keyword(s):

Retrospective Analysis ◽

Sacral Fracture ◽

Iliosacral Screw ◽

Screw Insertion ◽

3D Printed

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Sound Production Treatment for Acquired Apraxia of Speech: An Examination of Dosage in Relation to Probe Performance

American Journal of Speech-Language Pathology ◽

10.1044/2020_ajslp-19-00110 ◽

2020 ◽

pp. 1-16

Author(s):

Julie L. Wambaugh ◽

Lydia Kallhoff ◽

Christina Nessler

Keyword(s):

Retrospective Analysis ◽

Sound Production ◽

Apraxia Of Speech ◽

Practice Schedule ◽

Practice Schedules ◽

Baseline Performance ◽

The Mean ◽

Number Of Treatment ◽

The Impact

Purpose This study was designed to examine the association of dosage and effects of Sound Production Treatment (SPT) for acquired apraxia of speech. Method Treatment logs and probe data from 20 speakers with apraxia of speech and aphasia were submitted to a retrospective analysis. The number of treatment sessions and teaching episodes was examined relative to (a) change in articulation accuracy above baseline performance, (b) mastery of production, and (c) maintenance. The impact of practice schedule (SPT-Blocked vs. SPT-Random) was also examined. Results The average number of treatment sessions conducted prior to change was 5.4 for SPT-Blocked and 3.9 for SPT-Random. The mean number of teaching episodes preceding change was 334 for SPT-Blocked and 179 for SPT-Random. Mastery occurred within an average of 13.7 sessions (1,252 teaching episodes) and 12.4 sessions (1,082 teaching episodes) for SPT-Blocked and SPT-Random, respectively. Comparisons of dosage metric values across practice schedules did not reveal substantial differences. Significant negative correlations were found between follow-up probe performance and the dosage metrics. Conclusions Only a few treatment sessions were needed to achieve initial positive changes in articulation, with mastery occurring within 12–14 sessions for the majority of participants. Earlier occurrence of change or mastery was associated with better follow-up performance. Supplemental Material https://doi.org/10.23641/asha.12592190

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