Journal of Bone and Joint Surgery, American Volume, Apr 19, 2022
Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment ... more Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment of primary osteoarthritis. However, limited data are available regarding the outcomes of RSA as compared with anatomic total shoulder arthroplasty (TSA) in the setting of osteoarthritis. Methods: We performed a retrospective matched-cohort study of patients who had undergone TSA and RSA for the treatment of primary osteoarthritis and who had a minimum of 2 years of follow-up. Patients were propensity score-matched by age, sex, body mass index (BMI), preoperative American Shoulder and Elbow Surgeons (ASES) score, preoperative active forward elevation, and Walch glenoid morphology. Baseline patient demographics and clinical outcomes, including active range of motion, ASES score, Single Assessment Numerical Evaluation (SANE), and visual analog scale (VAS) for pain, were collected. Clinical and radiographic complications were evaluated. Results: One hundred and thirty-four patients (67 patients per group) were included; the mean duration of follow-up (and standard deviation) was 30 ± 10.7 months. No significant differences were found between the TSA and RSA groups in terms of the baseline or final VAS pain score (p = 0.99 and p = 0.99, respectively), ASES scores (p = 0.99 and p = 0.49, respectively), or SANE scores (p = 0.22 and p = 0.73, respectively). TSA was associated with significantly better postoperative active forward elevation (149° ± 13° versus 142° ± 15°; p = 0.003), external rotation (63° ± 14° versus 57° ± 18°; p = 0.02), and internal rotation (≥L3) (68.7% versus 37.3%; p < 0.001); however, there were only significant baseline-to-postoperative improvements in internal rotation (gain of ≥4 levels in 53.7% versus 31.3%; p = 0.009). The overall complication rate was 4.5% (6 of 134), with no significant difference between TSA and RSA (p = 0.99). Radiolucent lines were observed in association with 14.9% of TSAs, with no gross glenoid loosening. One TSA (1.5%) was revised to RSA for the treatment of a rotator cuff tear. No loosening or revision was encountered in the RSA group. Conclusions: When performed for the treatment of osteoarthritis, TSA and RSA resulted in similar short-term patient-reported outcomes, with better postoperative range of motion after TSA. Longer follow-up is needed to determine the ultimate value of RSA in the setting of osteoarthritis. Level of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.
Journal of Shoulder and Elbow Surgery, Oct 1, 2022
BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomec... more BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomechanics and baseplate failure in reverse shoulder arthroplasty (RSA). However, much of this has been rooted in the total shoulder arthroplasty experience. In the current literature, it is not well-defined whether glenoid baseplate positioning in reverse arthroplasty affects functional outcomes. Our practice has been to preserve glenoid bone stock without aiming for a certain degree of retroversion. We aimed to evaluate the correlation between pre- and postoperative retroversion in a cohort of RSAs as well as determine the effect of glenoid retroversion on functional outcomes, range of motion, and postoperative complications. METHODS A retrospective review of patients who had an RSA between 2017 and 2019 was performed. Preoperative computed tomography (CT) scans were used to assess preop retroversion, and axillary radiographs were used for postoperative retroversion. Outcome measures included American Shoulder and Elbow Surgeons (ASES) score, Visual Analog Scale (VAS) for pain score, Single Assessment Numerical Evaluation (SANE) score, range of motion, radiographic lucency, and complications. RESULTS 271 patients were eligible for the study. There was a 76.9 percent 2-year follow-up rate. There were 161 patients who had postoperative retroversion less than or equal to 15 degrees (Group A), and 110 patients who had retroversion greater than 15 degrees (Group B). There were no significant differences in ASES, VAS, or SANE scores. There were also no significant differences in postoperative range of motion. There was one baseplate failure in each group, and there was one patient in group B with asymptomatic radiographic loosening (baseplate at risk). The mean change in pre- to postoperative retroversion was 1 and 4 degrees in Group A and B, respectively. CONCLUSION There was no significant difference in postoperative functional outcomes, range of motion, or complications between patients who had baseplate retroversion 15 degrees or less versus those who had retroversion greater than 15 degrees.
Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment ... more Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment of primary osteoarthritis. However, limited data are available regarding the outcomes of RSA as compared with anatomic total shoulder arthroplasty (TSA) in the setting of osteoarthritis. Methods: We performed a retrospective matched-cohort study of patients who had undergone TSA and RSA for the treatment of primary osteoarthritis and who had a minimum of 2 years of follow-up. Patients were propensity score-matched by age, sex, body mass index (BMI), preoperative American Shoulder and Elbow Surgeons (ASES) score, preoperative active forward elevation, and Walch glenoid morphology. Baseline patient demographics and clinical outcomes, including active range of motion, ASES score, Single Assessment Numerical Evaluation (SANE), and visual analog scale (VAS) for pain, were collected. Clinical and radiographic complications were evaluated. Results: One hundred and thirty-four patients (67 patie...
BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomec... more BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomechanics and baseplate failure in reverse shoulder arthroplasty (RSA). However, much of this has been rooted in the total shoulder arthroplasty experience. In the current literature, it is not well-defined whether glenoid baseplate positioning in reverse arthroplasty affects functional outcomes. Our practice has been to preserve glenoid bone stock without aiming for a certain degree of retroversion. We aimed to evaluate the correlation between pre- and postoperative retroversion in a cohort of RSAs as well as determine the effect of glenoid retroversion on functional outcomes, range of motion, and postoperative complications. METHODS A retrospective review of patients who had an RSA between 2017 and 2019 was performed. Preoperative computed tomography (CT) scans were used to assess preop retroversion, and axillary radiographs were used for postoperative retroversion. Outcome measures included American Shoulder and Elbow Surgeons (ASES) score, Visual Analog Scale (VAS) for pain score, Single Assessment Numerical Evaluation (SANE) score, range of motion, radiographic lucency, and complications. RESULTS 271 patients were eligible for the study. There was a 76.9 percent 2-year follow-up rate. There were 161 patients who had postoperative retroversion less than or equal to 15 degrees (Group A), and 110 patients who had retroversion greater than 15 degrees (Group B). There were no significant differences in ASES, VAS, or SANE scores. There were also no significant differences in postoperative range of motion. There was one baseplate failure in each group, and there was one patient in group B with asymptomatic radiographic loosening (baseplate at risk). The mean change in pre- to postoperative retroversion was 1 and 4 degrees in Group A and B, respectively. CONCLUSION There was no significant difference in postoperative functional outcomes, range of motion, or complications between patients who had baseplate retroversion 15 degrees or less versus those who had retroversion greater than 15 degrees.
This research project could not have been accomplished without the assistance of the following in... more This research project could not have been accomplished without the assistance of the following individuals who spent countless hours patiently and effectively defending the significance of the study topic in order to collect data.
The natural vegetation on the coastal sands of Central and Southern Vietnam seems to not be in re... more The natural vegetation on the coastal sands of Central and Southern Vietnam seems to not be in relation with the chemical composition of the sands, but with the age of sediments.
The 1:50000 Vegetation Map of Cam Ranh Peninsula is one of the first study performed in South Vie... more The 1:50000 Vegetation Map of Cam Ranh Peninsula is one of the first study performed in South Vietnam; it aims to locate various vegetation on coastal sands and it represents a synthesis of phytogeographic observations. (Barry J.P. and Phung Trung Ngan, 1960, Barry J. P., Le-Cȏng-Kiet Hoang and Pham-Hȏ, 1961 Barry J. P., Le-Cȏng-Kiet and Vu-Van Cuong, 1961).
Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, Jan 5, 2018
Customized Individually Made (CIM) Bicompartmental Knee Arthroplasty (BKA) implants and three-dim... more Customized Individually Made (CIM) Bicompartmental Knee Arthroplasty (BKA) implants and three-dimensional printed customized instruments are available to fit to each patient's unique anatomy, medial or lateral with patellofemoral. This study aimed to evaluate the clinical outcomes after CIM-BKA. Fifty-five patients [59 knees; average age, 51 years; standard deviation (SD), 6.8; range 37-65 years] who underwent CIM-BKA were evaluated over an average of 3.8-year follow-up (SD 1.6; range 1-6 years). Forty-one knees underwent BKA combined medial and patellofemoral replacement (BKA-MP) and 18 knees underwent BKA combined lateral with patellofemoral replacement (BKA-LP). Survival rates, the modified Cincinnati Knee Rating Scale, WOMAC, VAS, SF-36, a satisfaction survey, and radiographic evaluation were used to evaluate outcomes. Overall, survival rates were 98% and 92% at 2 and 5 years, respectively. Of 56 knees (95%) that did not fail, all patient-reported functional scores significa...
A fluorocarbon polymer generated by plasma polymerization of CF4/CH2F2 used as a model polymer fo... more A fluorocarbon polymer generated by plasma polymerization of CF4/CH2F2 used as a model polymer for sidewall residues was subjected to ultraviolet (UV) irradiation (ë=254 nm). Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy indicated that the as-deposited fluorocarbon polymer mainly contains CF, CF2, and a small concentration of unsaturated, fluorinated C=C bonds, and carbonyl functionalities. A partial removal of the polymer occurred during UV irradiation in oxygen. Experimental results showed that UV irradiation resulted in a slight decrease in fluorine content concomitant with the formation of carbonyl groups. The presence of reactive species such as oxygen during UV treatment (by production of singlet oxygen and radicals) was necessary to allow bond cleavage and an increase of hydrophilicity of the polymer fragments thus making the removal of the polymer possible in a subsequent wet clean. In terms of polymer bonding structure, the presence of C=C bon...
2003 5th International Conference on ASIC. Proceedings (IEEE Cat. No.03TH8690), 2003
Abshact - Haze, the low frequency signal of light scattering, is already accessible in most fabs ... more Abshact - Haze, the low frequency signal of light scattering, is already accessible in most fabs and contains very usefir surface information. It can be used as a proxy for other me#rologv tools to measure thickness, repectivip, roughness, defects .... and can be integrated in SPC ...
We report the characterization of interface formation between Au(Au) and pentacene, an organic ma... more We report the characterization of interface formation between Au(Au) and pentacene, an organic material used as an active material in Organic Thin-Film Transistors, using x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS). XPS results indicate that there is no ...
Journal of Bone and Joint Surgery, American Volume, Apr 19, 2022
Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment ... more Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment of primary osteoarthritis. However, limited data are available regarding the outcomes of RSA as compared with anatomic total shoulder arthroplasty (TSA) in the setting of osteoarthritis. Methods: We performed a retrospective matched-cohort study of patients who had undergone TSA and RSA for the treatment of primary osteoarthritis and who had a minimum of 2 years of follow-up. Patients were propensity score-matched by age, sex, body mass index (BMI), preoperative American Shoulder and Elbow Surgeons (ASES) score, preoperative active forward elevation, and Walch glenoid morphology. Baseline patient demographics and clinical outcomes, including active range of motion, ASES score, Single Assessment Numerical Evaluation (SANE), and visual analog scale (VAS) for pain, were collected. Clinical and radiographic complications were evaluated. Results: One hundred and thirty-four patients (67 patients per group) were included; the mean duration of follow-up (and standard deviation) was 30 ± 10.7 months. No significant differences were found between the TSA and RSA groups in terms of the baseline or final VAS pain score (p = 0.99 and p = 0.99, respectively), ASES scores (p = 0.99 and p = 0.49, respectively), or SANE scores (p = 0.22 and p = 0.73, respectively). TSA was associated with significantly better postoperative active forward elevation (149° ± 13° versus 142° ± 15°; p = 0.003), external rotation (63° ± 14° versus 57° ± 18°; p = 0.02), and internal rotation (≥L3) (68.7% versus 37.3%; p < 0.001); however, there were only significant baseline-to-postoperative improvements in internal rotation (gain of ≥4 levels in 53.7% versus 31.3%; p = 0.009). The overall complication rate was 4.5% (6 of 134), with no significant difference between TSA and RSA (p = 0.99). Radiolucent lines were observed in association with 14.9% of TSAs, with no gross glenoid loosening. One TSA (1.5%) was revised to RSA for the treatment of a rotator cuff tear. No loosening or revision was encountered in the RSA group. Conclusions: When performed for the treatment of osteoarthritis, TSA and RSA resulted in similar short-term patient-reported outcomes, with better postoperative range of motion after TSA. Longer follow-up is needed to determine the ultimate value of RSA in the setting of osteoarthritis. Level of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.
Journal of Shoulder and Elbow Surgery, Oct 1, 2022
BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomec... more BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomechanics and baseplate failure in reverse shoulder arthroplasty (RSA). However, much of this has been rooted in the total shoulder arthroplasty experience. In the current literature, it is not well-defined whether glenoid baseplate positioning in reverse arthroplasty affects functional outcomes. Our practice has been to preserve glenoid bone stock without aiming for a certain degree of retroversion. We aimed to evaluate the correlation between pre- and postoperative retroversion in a cohort of RSAs as well as determine the effect of glenoid retroversion on functional outcomes, range of motion, and postoperative complications. METHODS A retrospective review of patients who had an RSA between 2017 and 2019 was performed. Preoperative computed tomography (CT) scans were used to assess preop retroversion, and axillary radiographs were used for postoperative retroversion. Outcome measures included American Shoulder and Elbow Surgeons (ASES) score, Visual Analog Scale (VAS) for pain score, Single Assessment Numerical Evaluation (SANE) score, range of motion, radiographic lucency, and complications. RESULTS 271 patients were eligible for the study. There was a 76.9 percent 2-year follow-up rate. There were 161 patients who had postoperative retroversion less than or equal to 15 degrees (Group A), and 110 patients who had retroversion greater than 15 degrees (Group B). There were no significant differences in ASES, VAS, or SANE scores. There were also no significant differences in postoperative range of motion. There was one baseplate failure in each group, and there was one patient in group B with asymptomatic radiographic loosening (baseplate at risk). The mean change in pre- to postoperative retroversion was 1 and 4 degrees in Group A and B, respectively. CONCLUSION There was no significant difference in postoperative functional outcomes, range of motion, or complications between patients who had baseplate retroversion 15 degrees or less versus those who had retroversion greater than 15 degrees.
Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment ... more Background: Reverse shoulder arthroplasty (RSA) is increasingly being utilized for the treatment of primary osteoarthritis. However, limited data are available regarding the outcomes of RSA as compared with anatomic total shoulder arthroplasty (TSA) in the setting of osteoarthritis. Methods: We performed a retrospective matched-cohort study of patients who had undergone TSA and RSA for the treatment of primary osteoarthritis and who had a minimum of 2 years of follow-up. Patients were propensity score-matched by age, sex, body mass index (BMI), preoperative American Shoulder and Elbow Surgeons (ASES) score, preoperative active forward elevation, and Walch glenoid morphology. Baseline patient demographics and clinical outcomes, including active range of motion, ASES score, Single Assessment Numerical Evaluation (SANE), and visual analog scale (VAS) for pain, were collected. Clinical and radiographic complications were evaluated. Results: One hundred and thirty-four patients (67 patie...
BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomec... more BACKGROUND There is concern that excessive glenoid component retroversion leads to altered biomechanics and baseplate failure in reverse shoulder arthroplasty (RSA). However, much of this has been rooted in the total shoulder arthroplasty experience. In the current literature, it is not well-defined whether glenoid baseplate positioning in reverse arthroplasty affects functional outcomes. Our practice has been to preserve glenoid bone stock without aiming for a certain degree of retroversion. We aimed to evaluate the correlation between pre- and postoperative retroversion in a cohort of RSAs as well as determine the effect of glenoid retroversion on functional outcomes, range of motion, and postoperative complications. METHODS A retrospective review of patients who had an RSA between 2017 and 2019 was performed. Preoperative computed tomography (CT) scans were used to assess preop retroversion, and axillary radiographs were used for postoperative retroversion. Outcome measures included American Shoulder and Elbow Surgeons (ASES) score, Visual Analog Scale (VAS) for pain score, Single Assessment Numerical Evaluation (SANE) score, range of motion, radiographic lucency, and complications. RESULTS 271 patients were eligible for the study. There was a 76.9 percent 2-year follow-up rate. There were 161 patients who had postoperative retroversion less than or equal to 15 degrees (Group A), and 110 patients who had retroversion greater than 15 degrees (Group B). There were no significant differences in ASES, VAS, or SANE scores. There were also no significant differences in postoperative range of motion. There was one baseplate failure in each group, and there was one patient in group B with asymptomatic radiographic loosening (baseplate at risk). The mean change in pre- to postoperative retroversion was 1 and 4 degrees in Group A and B, respectively. CONCLUSION There was no significant difference in postoperative functional outcomes, range of motion, or complications between patients who had baseplate retroversion 15 degrees or less versus those who had retroversion greater than 15 degrees.
This research project could not have been accomplished without the assistance of the following in... more This research project could not have been accomplished without the assistance of the following individuals who spent countless hours patiently and effectively defending the significance of the study topic in order to collect data.
The natural vegetation on the coastal sands of Central and Southern Vietnam seems to not be in re... more The natural vegetation on the coastal sands of Central and Southern Vietnam seems to not be in relation with the chemical composition of the sands, but with the age of sediments.
The 1:50000 Vegetation Map of Cam Ranh Peninsula is one of the first study performed in South Vie... more The 1:50000 Vegetation Map of Cam Ranh Peninsula is one of the first study performed in South Vietnam; it aims to locate various vegetation on coastal sands and it represents a synthesis of phytogeographic observations. (Barry J.P. and Phung Trung Ngan, 1960, Barry J. P., Le-Cȏng-Kiet Hoang and Pham-Hȏ, 1961 Barry J. P., Le-Cȏng-Kiet and Vu-Van Cuong, 1961).
Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, Jan 5, 2018
Customized Individually Made (CIM) Bicompartmental Knee Arthroplasty (BKA) implants and three-dim... more Customized Individually Made (CIM) Bicompartmental Knee Arthroplasty (BKA) implants and three-dimensional printed customized instruments are available to fit to each patient's unique anatomy, medial or lateral with patellofemoral. This study aimed to evaluate the clinical outcomes after CIM-BKA. Fifty-five patients [59 knees; average age, 51 years; standard deviation (SD), 6.8; range 37-65 years] who underwent CIM-BKA were evaluated over an average of 3.8-year follow-up (SD 1.6; range 1-6 years). Forty-one knees underwent BKA combined medial and patellofemoral replacement (BKA-MP) and 18 knees underwent BKA combined lateral with patellofemoral replacement (BKA-LP). Survival rates, the modified Cincinnati Knee Rating Scale, WOMAC, VAS, SF-36, a satisfaction survey, and radiographic evaluation were used to evaluate outcomes. Overall, survival rates were 98% and 92% at 2 and 5 years, respectively. Of 56 knees (95%) that did not fail, all patient-reported functional scores significa...
A fluorocarbon polymer generated by plasma polymerization of CF4/CH2F2 used as a model polymer fo... more A fluorocarbon polymer generated by plasma polymerization of CF4/CH2F2 used as a model polymer for sidewall residues was subjected to ultraviolet (UV) irradiation (ë=254 nm). Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy indicated that the as-deposited fluorocarbon polymer mainly contains CF, CF2, and a small concentration of unsaturated, fluorinated C=C bonds, and carbonyl functionalities. A partial removal of the polymer occurred during UV irradiation in oxygen. Experimental results showed that UV irradiation resulted in a slight decrease in fluorine content concomitant with the formation of carbonyl groups. The presence of reactive species such as oxygen during UV treatment (by production of singlet oxygen and radicals) was necessary to allow bond cleavage and an increase of hydrophilicity of the polymer fragments thus making the removal of the polymer possible in a subsequent wet clean. In terms of polymer bonding structure, the presence of C=C bon...
2003 5th International Conference on ASIC. Proceedings (IEEE Cat. No.03TH8690), 2003
Abshact - Haze, the low frequency signal of light scattering, is already accessible in most fabs ... more Abshact - Haze, the low frequency signal of light scattering, is already accessible in most fabs and contains very usefir surface information. It can be used as a proxy for other me#rologv tools to measure thickness, repectivip, roughness, defects .... and can be integrated in SPC ...
We report the characterization of interface formation between Au(Au) and pentacene, an organic ma... more We report the characterization of interface formation between Au(Au) and pentacene, an organic material used as an active material in Organic Thin-Film Transistors, using x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS). XPS results indicate that there is no ...
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