Objective: There is increased use of 3-dimensional (3D)-printing for manufacturing of interbody cages to create microscale surface features that promote bone formation. Those features may be vulnerable to abrasion and/or delamination during cage impaction. Our objective was to quantify loss of mass and changes in surface topography of 3D-printed titanium interbody cages due to surgical impaction. Methods: Eight surfaces of four 3D-printed titanium modular interbody fusion cages were tested. The cages were impacted into the Sawbones model with compression preload of either 200N or 400N using a guided 1-lb (0.45 kg) drop weight. Mass and surface roughness parameters of each endplate were recorded and compared for differences. Results: Significant weight loss was observed for the superior endplate group and for both 200N and 400N preloads. For pooled data comparison, significant postimpaction decreases were observed for mean roughness, root-mean-squared roughness, mean roughness depth, and total height of roughness profile. No significant differences were observed for profile skewness and kurtosis. There were significant changes in almost all roughness parameters in the anterior region of the cage postimpaction with significant changes in 2 out of 6 parameters in the middle, posterior, and central regions postimpaction. Conclusion Three-dimensional-printed titanium interbody fusion cages underwent loss of mass and alteration in surface topography during benchtop testing replicating physiologic conditions. There was an endplate- and region-specific postimpaction change in roughness parameters. The anterior surface experienced the largest change in surface parameters postimpaction. Our results have implications for future cage design and pre-approval testing of 3D-printed implants.

Purpose: Cholestatic complications remain a primary cause of post-liver transplantation (LTX) morbidity in pediatric patients. Standard biliary access by endoscopic retrograde cholangioscopy may not be feasible due to modified biliary drainage. Percutaneous transhepatic biliary drainage (PTCD) may be performed alternatively. However, systematic data concerning safety and efficacy of PTCD in these patients are scarce. Methods: In this retrospective study, procedural and safety characteristics of PTCD in pediatric patients following LTX were analyzed. We compared laboratory indicators of inflammation, cholestasis, and graft function before and at 6 and 12 months after the first PTCD insertion. Efficacy was analyzed by percentage of patients without cholangitis, need for surgical biliary re-intervention and re-transplantation during a follow-up period of 60 months. Results: Over a decade, PTCD was attempted in a total of 15 patients, with technical success (93.3%) in 14 patients. Periprocedural complications, including bleeding (7.1%) and cholangitis (21.4%) were observed in patients. During follow-up, both MELD-score (baseline:13 [8–15] vs. 12 months: 8 [7–8], p<0.001) and parameters of cholestasis (GGT: baseline: 286 [47–458] U/L vs. 12 months: 105 [26–147] U/L, p=0.024) decreased. Prior to PTCD, cholangitis (64.3%) and cholangiosepsis (21.4%) were common complications. In contrast, following PTCD, cholangitis occurred in only one patient (7.1%). Five patients (35.7%) needed surgical biliary re-intervention and two (14.3%) required re-transplantation. Conclusion PTCD in pediatric patients following LTX had an acceptable safety profile, demonstrating a biochemical improvement of both cholestasis and graft function and may prevent cholestatic complications, thus reducing the need for surgical re-intervention and re-transplantation.

Background/Aims: Small polyps are the most frequently detected lesions during colonoscopy, with an incomplete resection rate of 6.8% to 15.9%. This study aimed to improve small polyp cold snare resection radicality using submucosal contrast dye pre-lifting (PL+CSP). Methods: This single-center, prospective, randomized controlled trial compared the standard cold snare polypectomy technique (PL-CSP) with PL+CSP to evaluate endoscopic and histological complete resection rates, adverse events, procedural times, and polyp retrieval failure rates. Results: In 143 patients consecutively enrolled, 186 small polyps were detected and randomly assigned following a 1:1 ratio to the PL-CSP (n=97, 51.6%) and PL+CSP (n=90, 48.4%) techniques. Endoscopic (p=0.97) and histologic (p=0.23) complete resection rates did not differ significantly even in univariate analysis. The intraprocedural bleeding rate was significantly higher in the PL+CSP group as confirmed by the univariate analysis (35.8% vs. 8.3%, p<0.001). The polyps retrieval failure rates were similar (p=0.83). Procedural time was significantly longer for PL+CSP (median time, 75 vs. 45 seconds; p<0.001), without impacting colonoscopy withdrawal time (p=0.215). Conclusions PL+CSP of small polyps did not improve endoscopic and histological complete resection rates and polyp sample retrieval. PL+CSP had higher rates of intraprocedural bleeding and was “time-consuming”.

Objective: There is increased use of 3-dimensional (3D)-printing for manufacturing of interbody cages to create microscale surface features that promote bone formation. Those features may be vulnerable to abrasion and/or delamination during cage impaction. Our objective was to quantify loss of mass and changes in surface topography of 3D-printed titanium interbody cages due to surgical impaction. Methods: Eight surfaces of four 3D-printed titanium modular interbody fusion cages were tested. The cages were impacted into the Sawbones model with compression preload of either 200N or 400N using a guided 1-lb (0.45 kg) drop weight. Mass and surface roughness parameters of each endplate were recorded and compared for differences. Results: Significant weight loss was observed for the superior endplate group and for both 200N and 400N preloads. For pooled data comparison, significant postimpaction decreases were observed for mean roughness, root-mean-squared roughness, mean roughness depth, and total height of roughness profile. No significant differences were observed for profile skewness and kurtosis. There were significant changes in almost all roughness parameters in the anterior region of the cage postimpaction with significant changes in 2 out of 6 parameters in the middle, posterior, and central regions postimpaction. Conclusion Three-dimensional-printed titanium interbody fusion cages underwent loss of mass and alteration in surface topography during benchtop testing replicating physiologic conditions. There was an endplate- and region-specific postimpaction change in roughness parameters. The anterior surface experienced the largest change in surface parameters postimpaction. Our results have implications for future cage design and pre-approval testing of 3D-printed implants.

Purpose: Cholestatic complications remain a primary cause of post-liver transplantation (LTX) morbidity in pediatric patients. Standard biliary access by endoscopic retrograde cholangioscopy may not be feasible due to modified biliary drainage. Percutaneous transhepatic biliary drainage (PTCD) may be performed alternatively. However, systematic data concerning safety and efficacy of PTCD in these patients are scarce. Methods: In this retrospective study, procedural and safety characteristics of PTCD in pediatric patients following LTX were analyzed. We compared laboratory indicators of inflammation, cholestasis, and graft function before and at 6 and 12 months after the first PTCD insertion. Efficacy was analyzed by percentage of patients without cholangitis, need for surgical biliary re-intervention and re-transplantation during a follow-up period of 60 months. Results: Over a decade, PTCD was attempted in a total of 15 patients, with technical success (93.3%) in 14 patients. Periprocedural complications, including bleeding (7.1%) and cholangitis (21.4%) were observed in patients. During follow-up, both MELD-score (baseline:13 [8–15] vs. 12 months: 8 [7–8], p<0.001) and parameters of cholestasis (GGT: baseline: 286 [47–458] U/L vs. 12 months: 105 [26–147] U/L, p=0.024) decreased. Prior to PTCD, cholangitis (64.3%) and cholangiosepsis (21.4%) were common complications. In contrast, following PTCD, cholangitis occurred in only one patient (7.1%). Five patients (35.7%) needed surgical biliary re-intervention and two (14.3%) required re-transplantation. Conclusion PTCD in pediatric patients following LTX had an acceptable safety profile, demonstrating a biochemical improvement of both cholestasis and graft function and may prevent cholestatic complications, thus reducing the need for surgical re-intervention and re-transplantation.

Objective: There is increased use of 3-dimensional (3D)-printing for manufacturing of interbody cages to create microscale surface features that promote bone formation. Those features may be vulnerable to abrasion and/or delamination during cage impaction. Our objective was to quantify loss of mass and changes in surface topography of 3D-printed titanium interbody cages due to surgical impaction. Methods: Eight surfaces of four 3D-printed titanium modular interbody fusion cages were tested. The cages were impacted into the Sawbones model with compression preload of either 200N or 400N using a guided 1-lb (0.45 kg) drop weight. Mass and surface roughness parameters of each endplate were recorded and compared for differences. Results: Significant weight loss was observed for the superior endplate group and for both 200N and 400N preloads. For pooled data comparison, significant postimpaction decreases were observed for mean roughness, root-mean-squared roughness, mean roughness depth, and total height of roughness profile. No significant differences were observed for profile skewness and kurtosis. There were significant changes in almost all roughness parameters in the anterior region of the cage postimpaction with significant changes in 2 out of 6 parameters in the middle, posterior, and central regions postimpaction. Conclusion Three-dimensional-printed titanium interbody fusion cages underwent loss of mass and alteration in surface topography during benchtop testing replicating physiologic conditions. There was an endplate- and region-specific postimpaction change in roughness parameters. The anterior surface experienced the largest change in surface parameters postimpaction. Our results have implications for future cage design and pre-approval testing of 3D-printed implants.