There are diverse products related to human buttocks, which need to be designed, manufactured and evaluated with 3D buttock model. The 3D buttock model used in present research field is just simple approximate model s...There are diverse products related to human buttocks, which need to be designed, manufactured and evaluated with 3D buttock model. The 3D buttock model used in present research field is just simple approximate model similar to human buttocks. The 3D buttock percentile model is highly desired in the ergonomics design and evaluation for these products. So far, there is no research on the percentile sizing system of human 3D buttock model. So the purpose of this paper is to develop a new method for building three-dimensional buttock percentile model in computer system. After scanning the 3D shape of buttocks, the cloud data of 3D points is imported into the reverse engineering software（Geomagic） for the reconstructing of the buttock surface model. Five characteristic dimensions of the buttock are measured through mark-points after models being imported into engineering software CATIA. A series of space points are obtained by the intersecting of the cutting slices and 3D buttock surface model, and then are ordered based on the sequence number of the horizontal and vertical slices. The 1st, 5th, 50 th, 95 th, 99 th percentile values of the five dimensions and the spatial coordinate values of the space points are obtained, and used to reconstruct percentile buttock models. This research proposes a establishing method of percentile sizing system of buttock 3D model based on the percentile values of the ischial tuberosities diameter, the distances from margin to ischial tuberosity and the space coordinates value of coordinate points, for establishing the Nth percentile 3D buttock model and every special buttock types model. The proposed method also serves as a useful guidance for the other 3D percentile models establishment for other part in human body with characteristic points.展开更多
Objective: Autologous fat-grafting for the purpose of breast augmentation has gained widespread acceptance as a viable and safe alternative to classical breast implant procedures and has recently been successfully app...Objective: Autologous fat-grafting for the purpose of breast augmentation has gained widespread acceptance as a viable and safe alternative to classical breast implant procedures and has recently been successfully applied to buttock augmentation. Due to the numerous patient re-positionings and widely variable OR time, these procedures present unique challenges for anesthesiologists. Our goal is to discuss the current surgical methods, anesthetic methods, risks and benefits of this procedure. Methods: This is a retrospective cohort study in the setting of the operating room. Twenty-nine consecutive cases of mega-volume fat transplantation, defined as >300 cc to an individual site, performed by one surgeon, were reviewed. Age, Body Mass Index, total fat injected, total operating room time, maximum intraoperative temperature, minimum intraoperative and temperature were measured. RESULTS: Our procedure has enjoyed a 100% patient satisfaction rate. Analysis reveals high variability in age (21 - 57), total fat injected (200 cc - 1990 cc), patient Body Mass Index (18.8 - 42.2) and total operating room time (1:23:00 - 6:14:00) for our procedures. There were no instances of major complications in this cohort. Conclusions: Autologous fat transplantation for the purposes of breast and buttock augmentation is an emerging technique that shows great promise and high patient satisfaction, but providing unique challenges for anesthesiologists and surgeons.展开更多
Pressure injuries are frequent secondary complications that occur in patients with Spinal Cord Injury (SCI), and the recurrence rate of ischial pressure injury is highest in SCI patients. Most SCI patients use wheelch...Pressure injuries are frequent secondary complications that occur in patients with Spinal Cord Injury (SCI), and the recurrence rate of ischial pressure injury is highest in SCI patients. Most SCI patients use wheelchairs, and some studies have shown a relationship between buttock pressure and sitting posture. However, the pressure distribution during wheelchair maneuvering is unclear. We measured and compared the shift of the ischial region when maneuvering a standard wheelchair or electric wheelchair in healthy adults. The subjects drove wheelchairs on a flat ground of 10 m and the shift of ischial region was measured with a pressure distribution-measuring device. The ischial region shifted forward or backward while maneuvering both the standard wheelchair and the electric wheelchair, and the shift rate of the ischial region was not significantly different between the standard wheelchair and the electric wheelchair. The ischial region shift occurred when the forward head moved by the video while maneuvering both a standard wheelchair and an electric wheelchair. Therefore, the shift might occurred because the pelvis shifted forward in conjunction with head movement during maneuvering of both the standard wheelchair and the electric wheelchair. This result showed that it is important to reduce head and trunk movements when maneuvering a wheelchair to reduce the shear force on the buttocks and prevent pressure injuries.展开更多
文摘There are diverse products related to human buttocks, which need to be designed, manufactured and evaluated with 3D buttock model. The 3D buttock model used in present research field is just simple approximate model similar to human buttocks. The 3D buttock percentile model is highly desired in the ergonomics design and evaluation for these products. So far, there is no research on the percentile sizing system of human 3D buttock model. So the purpose of this paper is to develop a new method for building three-dimensional buttock percentile model in computer system. After scanning the 3D shape of buttocks, the cloud data of 3D points is imported into the reverse engineering software（Geomagic） for the reconstructing of the buttock surface model. Five characteristic dimensions of the buttock are measured through mark-points after models being imported into engineering software CATIA. A series of space points are obtained by the intersecting of the cutting slices and 3D buttock surface model, and then are ordered based on the sequence number of the horizontal and vertical slices. The 1st, 5th, 50 th, 95 th, 99 th percentile values of the five dimensions and the spatial coordinate values of the space points are obtained, and used to reconstruct percentile buttock models. This research proposes a establishing method of percentile sizing system of buttock 3D model based on the percentile values of the ischial tuberosities diameter, the distances from margin to ischial tuberosity and the space coordinates value of coordinate points, for establishing the Nth percentile 3D buttock model and every special buttock types model. The proposed method also serves as a useful guidance for the other 3D percentile models establishment for other part in human body with characteristic points.
文摘Objective: Autologous fat-grafting for the purpose of breast augmentation has gained widespread acceptance as a viable and safe alternative to classical breast implant procedures and has recently been successfully applied to buttock augmentation. Due to the numerous patient re-positionings and widely variable OR time, these procedures present unique challenges for anesthesiologists. Our goal is to discuss the current surgical methods, anesthetic methods, risks and benefits of this procedure. Methods: This is a retrospective cohort study in the setting of the operating room. Twenty-nine consecutive cases of mega-volume fat transplantation, defined as >300 cc to an individual site, performed by one surgeon, were reviewed. Age, Body Mass Index, total fat injected, total operating room time, maximum intraoperative temperature, minimum intraoperative and temperature were measured. RESULTS: Our procedure has enjoyed a 100% patient satisfaction rate. Analysis reveals high variability in age (21 - 57), total fat injected (200 cc - 1990 cc), patient Body Mass Index (18.8 - 42.2) and total operating room time (1:23:00 - 6:14:00) for our procedures. There were no instances of major complications in this cohort. Conclusions: Autologous fat transplantation for the purposes of breast and buttock augmentation is an emerging technique that shows great promise and high patient satisfaction, but providing unique challenges for anesthesiologists and surgeons.
文摘Pressure injuries are frequent secondary complications that occur in patients with Spinal Cord Injury (SCI), and the recurrence rate of ischial pressure injury is highest in SCI patients. Most SCI patients use wheelchairs, and some studies have shown a relationship between buttock pressure and sitting posture. However, the pressure distribution during wheelchair maneuvering is unclear. We measured and compared the shift of the ischial region when maneuvering a standard wheelchair or electric wheelchair in healthy adults. The subjects drove wheelchairs on a flat ground of 10 m and the shift of ischial region was measured with a pressure distribution-measuring device. The ischial region shifted forward or backward while maneuvering both the standard wheelchair and the electric wheelchair, and the shift rate of the ischial region was not significantly different between the standard wheelchair and the electric wheelchair. The ischial region shift occurred when the forward head moved by the video while maneuvering both a standard wheelchair and an electric wheelchair. Therefore, the shift might occurred because the pelvis shifted forward in conjunction with head movement during maneuvering of both the standard wheelchair and the electric wheelchair. This result showed that it is important to reduce head and trunk movements when maneuvering a wheelchair to reduce the shear force on the buttocks and prevent pressure injuries.
