The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Won Moon - One of the best experts on this subject based on the ideXlab platform.
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Tomographic assessment of palatal suture opening pattern and pterygopalatine suture disarticulation in the Axial Plane after midfacial skeletal expansion
Progress in Orthodontics, 2020Co-Authors: Ozge Colak, Ney Alberto Paredes, Islam Elkenawy, Martha Torres, Joseph Bui, Sara Jahangiri, Won MoonAbstract:Objective The purpose of this study was to assess the palatal suture opening and the pterygopalatine suture disarticulation pattern in the tomographic Axial Plane after treatment with midfacial skeletal expander (MSE). Materials and methods Pre- and post-expansion CBCT records of 50 subjects (20 males, 30 females, mean age 18 ± 3 years) who were treated with MSE (Biomaterials Korea, Seoul, Korea) appliance were superimposed and compared using OnDemand software. Reference Planes were identified and the angulation of the midpalatal suture opening after expansion was calculated as well as the frequency of the pterygopalatine suture split. Results After MSE treatment, the mean palatal suture opening angle (SOA) was 0.57°. (− 0.8° to 1.3°). There was no significant difference between males and females in terms of the palatal suture opening pattern ( P > 0.05). Only 3 out of 50 (6%) subjects presented SOA above 1 degree. Also, 3 out of 50 (6%) patients presented a negative SOA value. With regard to the pterygopalatine suture split, 84 sutures out of 100 (84%) presented openings between the medial and lateral pterygoid plates on both right and left sides. Partial split was detected with 8 patients (5 females, 3 males). Five patients had split only in the medial pterygoid plates of both pterygomaxillary sutures, and 3 patients exhibited disarticulation on the right side only. No significant differences were found in the frequency of suture opening between males and females ( P = 1.000). Conclusions MSE appliance performed almost parallel expansion in the Axial view. Remarkably, this study shows that pterygopalatine suture can be split by MSE appliance without the surgical intervention; the disarticulation of pterygopalatine suture was visible in most of the patients.
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Tomographic assessment of palatal suture opening pattern and pterygopalatine suture disarticulation in the Axial Plane after midfacial skeletal expansion
Progress in orthodontics, 2020Co-Authors: Ozge Colak, Ney Alberto Paredes, Islam Elkenawy, Martha Torres, Joseph Bui, Sara Jahangiri, Won MoonAbstract:The purpose of this study was to assess the palatal suture opening and the pterygopalatine suture disarticulation pattern in the tomographic Axial Plane after treatment with midfacial skeletal expander (MSE). Pre- and post-expansion CBCT records of 50 subjects (20 males, 30 females, mean age 18 ± 3 years) who were treated with MSE (Biomaterials Korea, Seoul, Korea) appliance were superimposed and compared using OnDemand software. Reference Planes were identified and the angulation of the midpalatal suture opening after expansion was calculated as well as the frequency of the pterygopalatine suture split. After MSE treatment, the mean palatal suture opening angle (SOA) was 0.57°. (− 0.8° to 1.3°). There was no significant difference between males and females in terms of the palatal suture opening pattern (P > 0.05). Only 3 out of 50 (6%) subjects presented SOA above 1 degree. Also, 3 out of 50 (6%) patients presented a negative SOA value. With regard to the pterygopalatine suture split, 84 sutures out of 100 (84%) presented openings between the medial and lateral pterygoid plates on both right and left sides. Partial split was detected with 8 patients (5 females, 3 males). Five patients had split only in the medial pterygoid plates of both pterygomaxillary sutures, and 3 patients exhibited disarticulation on the right side only. No significant differences were found in the frequency of suture opening between males and females (P = 1.000). MSE appliance performed almost parallel expansion in the Axial view. Remarkably, this study shows that pterygopalatine suture can be split by MSE appliance without the surgical intervention; the disarticulation of pterygopalatine suture was visible in most of the patients.
Yang-guk Chung - One of the best experts on this subject based on the ideXlab platform.
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Where Is the Ulnar Styloid Process? Identification of the Absolute Location of the Ulnar Styloid Process Based on CT and Verification of Neutral Forearm Rotation on Lateral Radiographs of the Wrist
Clinics in Orthopedic Surgery, 2018Co-Authors: Seung-han Shin, Yong-suk Lee, Jin-woo Kang, Dong-young Noh, Joon-yong Jung, Yang-guk ChungAbstract:Background The location of the ulnar styloid process can be confusing because the radius and the hand rotate around the ulna. The purpose of this study was to identify the absolute location of the ulnar styloid process, which is independent of forearm pronation or supination, to use it as a reference for neutral forearm rotation on lateral radiographs of the wrist. Methods Computed tomography (CT) images of 23 forearms taken with elbow flexion of 70° to 90° were analyzed. The Axial CT images were reconstructed to be perpendicular to the distal ulnar shaft. The absolute location of the ulnar styloid process in this study was defined as the position of the ulnar styloid process on the Axial Plane of the ulnar head relative to the long axis of the humeral shaft with the elbow set in the position for standard lateral radiographs of the wrist. To identify in which direction the ulnar styloid is located on the Axial Plane of the ulnar head, the angle between "the line of humeral long axis projected on the Axial Plane of the ulna" and "the line passing the center of the ulnar head and the center of the ulnar styloid" was measured (ulnar styloid direction angle). To identify how volarly or dorsally the ulnar styloid should appear on the true lateral view of the wrist, the ratio of "the volar-dorsal diameter of the ulnar head" and "the distance between the volar-most aspect of the ulnar head and the center of the ulnar styloid" was calculated (ulnar styloid location ratio). Results The mean ulnar styloid direction angle was 12° dorsally. The mean ulnar styloid location ratio was 1:0.55. Conclusions The ulnar styloid is located at nearly the ulnar-most (the opposite side of the humerus with the elbow flexed) and slightly dorsal aspects of the ulnar head on the Axial Plane. It should appear almost midway (55% dorsally) from the ulnar head on the standard lateral view of the wrist in neutral forearm rotation. These location references could help clinicians determine whether the forearm is in neutral or rotated position on an Axial CT/magnetic resonance imaging scan or a lateral radiograph of the wrist.
Maurilio Marcacci - One of the best experts on this subject based on the ideXlab platform.
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DOES TOTAL KNEE REPLACEMENT MODIFY FLEXION AXIS OF THE KNEE ON FRONTAL AND Axial Plane REGARDLESS FROM LIMB ALIGNMENT
Journal of biological regulators and homeostatic agents, 2015Co-Authors: Danilo Bruni, Francesco Iacono, Simone Bignozzi, Laura Bragonzoni, Marco Bontempi, Maria Pia Neri, Stefano Zaffagnini, Maurilio MarcacciAbstract:The optimal reference for rotational positioning of femoral component in total knee replacement (TKR) is debated. Navigation has been suggested for intra-op acquisition of patients specific kinematics and functional flexion axis (FFA). The main purpose of the present study is to prospectively investigate whether pre-operative FFA in patients with osteoarthritis (OA) and varus alignment changes after TKR and whether a correlation exists between post-op FFA and pre-op alignment. A navigated TKR was performed in 108 patients using a specific software to acquire passive joint kinematics before and after TKR. The knee was cycled through three passive range of motions (PROM), from 0° to 120°. FFA was computed using the mean helical axis algorithm. The angle between FFA and surgical TEA was determined on frontal (αf) and Axial (αa) Plane. The pre- and post-op hip-knee-ankle angle (HKA) was determined. Post-op FFA was different from pre-op FFA only on frontal Plane. No significant difference was found on Axial Plane. No correlation was found between HKA-pre and αA-pre. A significant correlation was found between HKA-pre and αFpre. The study concluded that TKR modifies FFA only on frontal Plane. No difference was found on Axial Plane. Pre-op FFA is in a more varus position respect to TEA. The position of FFA on frontal Plane is dependent on limb alignment. The present study has demonstrated TKR modifies the position of FFA only on frontal Plane. The position of FFA on Axial Plane is not dependent on the amount of varus deformity and is not influenced by TKR. Level of evidence, IV, case series.
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Does Total Knee Replacement Modify Flexion Axis of the Knee on Frontal and Axial Plane Regardless From Limb Alignment
Journal of Bone and Joint Surgery-british Volume, 2013Co-Authors: Danilo Bruni, Francesco Iacono, Francesca Colle, Simone Bignozzi, Maurilio MarcacciAbstract:BACKGROUND: The optimal reference for rotational positioning of femoral component in total knee replacement (TKR) is debated. Navigation has been suggested for intra-op acquisition of patient9s specific kinematics and functional flexion axis (FFA). QUESTIONS/PURPOSES: To prospectively investigate whether pre-operative FFA in patients with osteoarthritis (OA) and varus alignment changes after TKR and whether a correlation exists between post-op FFA and pre-op alignment. PATIENTS AND METHODS: A navigated TKR was performed in 108 patients using a specific software to acquire passive joint kinematics before and after TKR. The knee was cycled through three passive range of motions (PROM), from 0° to 120°. FFA was computed using the mean helical axis algorithm. The angle between FFA and surgical TEA was determined on frontal (αf) and Axial (αa12) Plane. The pre- and post-op hip-knee-ankle angle (HKA) was determined. RESULTS: Post-op FFA was different from pre-op FFA only on frontal Plane. No significant difference was found on Axial Plane. No correlation was found between HKA-pre and αA-pre. A significant correlation was found between HKA-pre and αF–pre. CONCLUSIONS: TKR modifies FFA only on frontal Plane. No difference was found on Axial Plane. Pre-op FFA is in a more varus position respect to TEA. The position of FFA on frontal Plane is dependent on limb alignment. TKR modifies the position of FFA only on frontal Plane. The position of FFA on Axial Plane is not dependent on the amount of varus deformity and is not influenced by TKR.
Ozge Colak - One of the best experts on this subject based on the ideXlab platform.
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Tomographic assessment of palatal suture opening pattern and pterygopalatine suture disarticulation in the Axial Plane after midfacial skeletal expansion
Progress in Orthodontics, 2020Co-Authors: Ozge Colak, Ney Alberto Paredes, Islam Elkenawy, Martha Torres, Joseph Bui, Sara Jahangiri, Won MoonAbstract:Objective The purpose of this study was to assess the palatal suture opening and the pterygopalatine suture disarticulation pattern in the tomographic Axial Plane after treatment with midfacial skeletal expander (MSE). Materials and methods Pre- and post-expansion CBCT records of 50 subjects (20 males, 30 females, mean age 18 ± 3 years) who were treated with MSE (Biomaterials Korea, Seoul, Korea) appliance were superimposed and compared using OnDemand software. Reference Planes were identified and the angulation of the midpalatal suture opening after expansion was calculated as well as the frequency of the pterygopalatine suture split. Results After MSE treatment, the mean palatal suture opening angle (SOA) was 0.57°. (− 0.8° to 1.3°). There was no significant difference between males and females in terms of the palatal suture opening pattern ( P > 0.05). Only 3 out of 50 (6%) subjects presented SOA above 1 degree. Also, 3 out of 50 (6%) patients presented a negative SOA value. With regard to the pterygopalatine suture split, 84 sutures out of 100 (84%) presented openings between the medial and lateral pterygoid plates on both right and left sides. Partial split was detected with 8 patients (5 females, 3 males). Five patients had split only in the medial pterygoid plates of both pterygomaxillary sutures, and 3 patients exhibited disarticulation on the right side only. No significant differences were found in the frequency of suture opening between males and females ( P = 1.000). Conclusions MSE appliance performed almost parallel expansion in the Axial view. Remarkably, this study shows that pterygopalatine suture can be split by MSE appliance without the surgical intervention; the disarticulation of pterygopalatine suture was visible in most of the patients.
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Tomographic assessment of palatal suture opening pattern and pterygopalatine suture disarticulation in the Axial Plane after midfacial skeletal expansion
Progress in orthodontics, 2020Co-Authors: Ozge Colak, Ney Alberto Paredes, Islam Elkenawy, Martha Torres, Joseph Bui, Sara Jahangiri, Won MoonAbstract:The purpose of this study was to assess the palatal suture opening and the pterygopalatine suture disarticulation pattern in the tomographic Axial Plane after treatment with midfacial skeletal expander (MSE). Pre- and post-expansion CBCT records of 50 subjects (20 males, 30 females, mean age 18 ± 3 years) who were treated with MSE (Biomaterials Korea, Seoul, Korea) appliance were superimposed and compared using OnDemand software. Reference Planes were identified and the angulation of the midpalatal suture opening after expansion was calculated as well as the frequency of the pterygopalatine suture split. After MSE treatment, the mean palatal suture opening angle (SOA) was 0.57°. (− 0.8° to 1.3°). There was no significant difference between males and females in terms of the palatal suture opening pattern (P > 0.05). Only 3 out of 50 (6%) subjects presented SOA above 1 degree. Also, 3 out of 50 (6%) patients presented a negative SOA value. With regard to the pterygopalatine suture split, 84 sutures out of 100 (84%) presented openings between the medial and lateral pterygoid plates on both right and left sides. Partial split was detected with 8 patients (5 females, 3 males). Five patients had split only in the medial pterygoid plates of both pterygomaxillary sutures, and 3 patients exhibited disarticulation on the right side only. No significant differences were found in the frequency of suture opening between males and females (P = 1.000). MSE appliance performed almost parallel expansion in the Axial view. Remarkably, this study shows that pterygopalatine suture can be split by MSE appliance without the surgical intervention; the disarticulation of pterygopalatine suture was visible in most of the patients.
Seung-han Shin - One of the best experts on this subject based on the ideXlab platform.
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Where Is the Ulnar Styloid Process? Identification of the Absolute Location of the Ulnar Styloid Process Based on CT and Verification of Neutral Forearm Rotation on Lateral Radiographs of the Wrist
Clinics in Orthopedic Surgery, 2018Co-Authors: Seung-han Shin, Yong-suk Lee, Jin-woo Kang, Dong-young Noh, Joon-yong Jung, Yang-guk ChungAbstract:Background The location of the ulnar styloid process can be confusing because the radius and the hand rotate around the ulna. The purpose of this study was to identify the absolute location of the ulnar styloid process, which is independent of forearm pronation or supination, to use it as a reference for neutral forearm rotation on lateral radiographs of the wrist. Methods Computed tomography (CT) images of 23 forearms taken with elbow flexion of 70° to 90° were analyzed. The Axial CT images were reconstructed to be perpendicular to the distal ulnar shaft. The absolute location of the ulnar styloid process in this study was defined as the position of the ulnar styloid process on the Axial Plane of the ulnar head relative to the long axis of the humeral shaft with the elbow set in the position for standard lateral radiographs of the wrist. To identify in which direction the ulnar styloid is located on the Axial Plane of the ulnar head, the angle between "the line of humeral long axis projected on the Axial Plane of the ulna" and "the line passing the center of the ulnar head and the center of the ulnar styloid" was measured (ulnar styloid direction angle). To identify how volarly or dorsally the ulnar styloid should appear on the true lateral view of the wrist, the ratio of "the volar-dorsal diameter of the ulnar head" and "the distance between the volar-most aspect of the ulnar head and the center of the ulnar styloid" was calculated (ulnar styloid location ratio). Results The mean ulnar styloid direction angle was 12° dorsally. The mean ulnar styloid location ratio was 1:0.55. Conclusions The ulnar styloid is located at nearly the ulnar-most (the opposite side of the humerus with the elbow flexed) and slightly dorsal aspects of the ulnar head on the Axial Plane. It should appear almost midway (55% dorsally) from the ulnar head on the standard lateral view of the wrist in neutral forearm rotation. These location references could help clinicians determine whether the forearm is in neutral or rotated position on an Axial CT/magnetic resonance imaging scan or a lateral radiograph of the wrist.
