Vaughan Bowen - Academia.edu (original) (raw)
Papers by Vaughan Bowen
Journal of Electromyography and Kinesiology, Feb 28, 2009
The physiological behavior of the abductor pollicis brevis (APB) muscle during early stage of fat... more The physiological behavior of the abductor pollicis brevis (APB) muscle during early stage of fatigue is important as a reference for future clinical assessment of a pathologically altered muscle, as e.g. in carpal tunnel syndrome. The purpose of this study was to assess changes of force and surface electromyograms (sEMG) during early stage of fatigue of the APB. Thumb abduction force and sEMG derived from a multi-electrode array were recorded during isometric contraction. Electrode placement over the innervation zone (IZ) and the muscle tendon interface were avoided. The sEMGs of two adjacent electrode pairs were selected for the analysis, which yielded (a) motor unit conduction velocities (MUCV) derived from a correlation analysis between the EMGs and (b) mean frequencies obtained by using either fast Fourier (FMF) or Wavelet Transform (WMF). Early fatigue resulted in a relative decay rate of force (-2.1%( *)s(-1)), MUCV (-1.5%( *)s(-1)), FMF (-4.1%( *)s(-1)), WMF (-3.7%( *)s(-1)) and in a change of the power spectrum shape. Lower mean frequencies were observed at greater distances from the IZ independently of fatigue. The APB muscle seems to be fast fatigable and the relative decay rate of mean frequency was significantly larger than the one of force and MUCV.
An Illustrated Guide to the Management of Injuries in Physical Activity, 2012
Orthopedics, 1986
Growth plates have been transferred both clinically and in experimental models since the end of t... more Growth plates have been transferred both clinically and in experimental models since the end of the 19th century. Results have been unpredictable and frequently unsatisfactory due to postoperative ischemia. Modern microvascular techniques have minimized this problem and preservation of growth plate structure and function has been reported after replantation and free tissue transfers in children and immature animals. Experimental revascularized growth plate transplants were first reported in 1979. Viable orthotopic transfers are associated with rapid bony union, maintenance of radiological structure, and continued growth in length at near normal rates. Detailed studies have demonstrated a continuation of cell division, metabolic activities, and normal histology. Technetium bone scans have been a useful postoperative indicator of viability, and ischemic times of more than three hours can be tolerated. The behavior of heterotopic transplants has not yet been fully studied. Early attemp...
The Journal of trauma, 1987
Sixty-three consecutive patients presented during an 18-month period with isolated closed fractur... more Sixty-three consecutive patients presented during an 18-month period with isolated closed fractures of the fifth metacarpal neck. Follow-up ranged from 3 to 20 months. Forty were recalled for study and divided into a conservative group (25 patients) and an operative group (15 patients). Both groups were statistically comparable. All patients obtained good results. Subjectively, no patient had long-term pain or dissatisfaction with the functional or cosmetic result. Objectively, all patients regained full joint motion and normal grip strength. Mild rotatory malalignment was present in both groups, but the conservative group had less extensor lag. The main difference between the two groups centered on residual dorsal angulation. This cosmetic deformity was considerably less in the operative group, although the cost of this improvement was significantly longer rehabilitation. Failure to correct dorsal angulation was not associated with functional disability.
Current Opinion in Orthopaedics, 1993
Veterinary Surgery, 1986
An axial pattern cutaneous free flap in the dog based on superficial cervical vessels was identif... more An axial pattern cutaneous free flap in the dog based on superficial cervical vessels was identified. Consistent anatomic landmarks were proposed. The vessels consistently emerged from the angle formed by the omotransversarius and trapezius muscles, and coursed in a craniodorsal direction. Eight orthotopic transfers were performed to evaluate the flap's potential as a free tissue transfer. Six of eight (75%) flaps survived. Arterial insufficiency was the likely cause of one failure. The cause of the other failure was considered to be venous occlusion. We conclude that the superficial cervical flap can be used successfully as a microvascular free tissue transfer in the dog. KIN FLAPS USING a direct cutaneous artery and vein S (axial pattern flaps) have proven useful in human * Hypaque M 75%.
Veterinary Surgery, 1988
An autogenous free vascular bone transfer using a segment of ulna along with its periosteum and v... more An autogenous free vascular bone transfer using a segment of ulna along with its periosteum and vascular pedicle was developed. The vascular pedicle, based on the common interosseous artery and vein, emerged where muscular branches from the cranial interosseous artery enter the extensor carpi ulnaris and lateral digital extensor muscles. Four autogenous heterotopic (ulna to tibia) vascular transfers by microvascular anastomosis and two avascular transfers were performed to compare the osteogenic potential and viability of free revascularized grafts with avascular bone grafts. Successful microvascular anastomosis was demonstrated in three of the four vascular transfers by early bone scanning using technetium-labeled polyphosphate. Radiographically, there was more periosteal new bone and callus formation in the successfully revascularized bone transfers than in the failed vascular transfer and the avascular controls. Histologically, viable bone with an intact medullary and periosteal vascular supply was recognized in the grafts successfully revascularized by microvascular anastomosis.
Spine, 1981
The macroscopic and microscopic anatomy of the sacroiliac joint from embryonic life until the eig... more The macroscopic and microscopic anatomy of the sacroiliac joint from embryonic life until the eighth decade is presented to establish a baseline of normal anatomy for this joint. The literature concerning the anatomy of the joint was reviewed and found to be fragmentary and conflicting, particularly concerning the diarthroidial characteristics of the joint. From fetal life onward, the iliac cartilage surface is fibrocartilaginous, while the sacral surface is hyaline cartilage. Degenerative arthrosis of the joint commences at an early age, affecting the iliac cartilage to a greater extent than its sacral counterpart. These early degenerative changes in the sacroiliac joint may very well be a more common cause of low-back pain than previously thought.
Plastic and Reconstructive Surgery, 1994
One-hundred and eighty patients undergoing limb-salvage surgery for soft-tissue sarcoma from 1986... more One-hundred and eighty patients undergoing limb-salvage surgery for soft-tissue sarcoma from 1986 to 1991 were assessed retrospectively for risk factors associated with major wound-healing complications. Twenty-three of 137 patients (16 percent) treated with primary direct wound closure sustained complications. In univariate analysis, the cross-sectional area of tumor resection, the use of preoperative irradiation, the width of the skin excision, a history of smoking, and a history of diabetes and/or vascular disease were associated with wound failure. Multivariate analysis revealed that preoperative irradiation (p = 0.04) and resection diameter (p = 0.017) accounted for the risk of complications. Eighteen additional patients were treated empirically with distant vascularized tissue transfer following preoperative irradiation because of concerns regarding potential wound complications. The lower complication rate in this group suggested that vascularized tissue transfer may be beneficial in lowering wound complication rates.
Plastic and Reconstructive Surgery, 1988
The construction details for an inexpensive, easy-to-build operating table for hand surgery have ... more The construction details for an inexpensive, easy-to-build operating table for hand surgery have been described. The table was specifically designed according to the needs of those working with it. It has been in daily use for over 2 years and has proved to be a popular product with all staff members.
Pediatric Neurosurgery, 1978
Microsurgery, 1993
The effect of different pre-existing health conditions on the resub of reconstructive microvascul... more The effect of different pre-existing health conditions on the resub of reconstructive microvascular surgery are reviewed. These conditions include: age, vital organ failure, diabetes, arterial and venous diseases, medications, smoking, wound healing disorders, epidermolysis bullosa, hematological diseases, multiple injury patients, pregnancy, and neuropsychiatric disease.
Microsurgery, 1991
Reconstructive procedures used in salvaging distal limb injuries in the dog are reviewed. Techniq... more Reconstructive procedures used in salvaging distal limb injuries in the dog are reviewed. Techniques employed to resurface the distal weight-bearing surface include local reconstruction using pedicle flap transposition of foot pads. The development of a previously described free microneurovascular digital foot pad flap is reviewed: the experimental results and potential for clinical use of the free flap are discussed.
Microsurgery, 1991
Various reconstructive techniques have been applied to the management of difficult wounds in the ... more Various reconstructive techniques have been applied to the management of difficult wounds in the dog. Wounds in the distal extremities and on the face are hard to manage by conventional methods. A free cutaneous flap, based on the superficial cervical vessels, was developed and used in a series of experimental and clinical cases. Six of eight experimental orthotopic transfers survived. The two failures were thought to be related to technical error. The seven flaps, used in clinical cases, all survived and successfully resolved the dogs' clinical problems.
Journal of Electromyography and Kinesiology, Feb 28, 2009
The physiological behavior of the abductor pollicis brevis (APB) muscle during early stage of fat... more The physiological behavior of the abductor pollicis brevis (APB) muscle during early stage of fatigue is important as a reference for future clinical assessment of a pathologically altered muscle, as e.g. in carpal tunnel syndrome. The purpose of this study was to assess changes of force and surface electromyograms (sEMG) during early stage of fatigue of the APB. Thumb abduction force and sEMG derived from a multi-electrode array were recorded during isometric contraction. Electrode placement over the innervation zone (IZ) and the muscle tendon interface were avoided. The sEMGs of two adjacent electrode pairs were selected for the analysis, which yielded (a) motor unit conduction velocities (MUCV) derived from a correlation analysis between the EMGs and (b) mean frequencies obtained by using either fast Fourier (FMF) or Wavelet Transform (WMF). Early fatigue resulted in a relative decay rate of force (-2.1%( *)s(-1)), MUCV (-1.5%( *)s(-1)), FMF (-4.1%( *)s(-1)), WMF (-3.7%( *)s(-1)) and in a change of the power spectrum shape. Lower mean frequencies were observed at greater distances from the IZ independently of fatigue. The APB muscle seems to be fast fatigable and the relative decay rate of mean frequency was significantly larger than the one of force and MUCV.
An Illustrated Guide to the Management of Injuries in Physical Activity, 2012
Orthopedics, 1986
Growth plates have been transferred both clinically and in experimental models since the end of t... more Growth plates have been transferred both clinically and in experimental models since the end of the 19th century. Results have been unpredictable and frequently unsatisfactory due to postoperative ischemia. Modern microvascular techniques have minimized this problem and preservation of growth plate structure and function has been reported after replantation and free tissue transfers in children and immature animals. Experimental revascularized growth plate transplants were first reported in 1979. Viable orthotopic transfers are associated with rapid bony union, maintenance of radiological structure, and continued growth in length at near normal rates. Detailed studies have demonstrated a continuation of cell division, metabolic activities, and normal histology. Technetium bone scans have been a useful postoperative indicator of viability, and ischemic times of more than three hours can be tolerated. The behavior of heterotopic transplants has not yet been fully studied. Early attemp...
The Journal of trauma, 1987
Sixty-three consecutive patients presented during an 18-month period with isolated closed fractur... more Sixty-three consecutive patients presented during an 18-month period with isolated closed fractures of the fifth metacarpal neck. Follow-up ranged from 3 to 20 months. Forty were recalled for study and divided into a conservative group (25 patients) and an operative group (15 patients). Both groups were statistically comparable. All patients obtained good results. Subjectively, no patient had long-term pain or dissatisfaction with the functional or cosmetic result. Objectively, all patients regained full joint motion and normal grip strength. Mild rotatory malalignment was present in both groups, but the conservative group had less extensor lag. The main difference between the two groups centered on residual dorsal angulation. This cosmetic deformity was considerably less in the operative group, although the cost of this improvement was significantly longer rehabilitation. Failure to correct dorsal angulation was not associated with functional disability.
Current Opinion in Orthopaedics, 1993
Veterinary Surgery, 1986
An axial pattern cutaneous free flap in the dog based on superficial cervical vessels was identif... more An axial pattern cutaneous free flap in the dog based on superficial cervical vessels was identified. Consistent anatomic landmarks were proposed. The vessels consistently emerged from the angle formed by the omotransversarius and trapezius muscles, and coursed in a craniodorsal direction. Eight orthotopic transfers were performed to evaluate the flap's potential as a free tissue transfer. Six of eight (75%) flaps survived. Arterial insufficiency was the likely cause of one failure. The cause of the other failure was considered to be venous occlusion. We conclude that the superficial cervical flap can be used successfully as a microvascular free tissue transfer in the dog. KIN FLAPS USING a direct cutaneous artery and vein S (axial pattern flaps) have proven useful in human * Hypaque M 75%.
Veterinary Surgery, 1988
An autogenous free vascular bone transfer using a segment of ulna along with its periosteum and v... more An autogenous free vascular bone transfer using a segment of ulna along with its periosteum and vascular pedicle was developed. The vascular pedicle, based on the common interosseous artery and vein, emerged where muscular branches from the cranial interosseous artery enter the extensor carpi ulnaris and lateral digital extensor muscles. Four autogenous heterotopic (ulna to tibia) vascular transfers by microvascular anastomosis and two avascular transfers were performed to compare the osteogenic potential and viability of free revascularized grafts with avascular bone grafts. Successful microvascular anastomosis was demonstrated in three of the four vascular transfers by early bone scanning using technetium-labeled polyphosphate. Radiographically, there was more periosteal new bone and callus formation in the successfully revascularized bone transfers than in the failed vascular transfer and the avascular controls. Histologically, viable bone with an intact medullary and periosteal vascular supply was recognized in the grafts successfully revascularized by microvascular anastomosis.
Spine, 1981
The macroscopic and microscopic anatomy of the sacroiliac joint from embryonic life until the eig... more The macroscopic and microscopic anatomy of the sacroiliac joint from embryonic life until the eighth decade is presented to establish a baseline of normal anatomy for this joint. The literature concerning the anatomy of the joint was reviewed and found to be fragmentary and conflicting, particularly concerning the diarthroidial characteristics of the joint. From fetal life onward, the iliac cartilage surface is fibrocartilaginous, while the sacral surface is hyaline cartilage. Degenerative arthrosis of the joint commences at an early age, affecting the iliac cartilage to a greater extent than its sacral counterpart. These early degenerative changes in the sacroiliac joint may very well be a more common cause of low-back pain than previously thought.
Plastic and Reconstructive Surgery, 1994
One-hundred and eighty patients undergoing limb-salvage surgery for soft-tissue sarcoma from 1986... more One-hundred and eighty patients undergoing limb-salvage surgery for soft-tissue sarcoma from 1986 to 1991 were assessed retrospectively for risk factors associated with major wound-healing complications. Twenty-three of 137 patients (16 percent) treated with primary direct wound closure sustained complications. In univariate analysis, the cross-sectional area of tumor resection, the use of preoperative irradiation, the width of the skin excision, a history of smoking, and a history of diabetes and/or vascular disease were associated with wound failure. Multivariate analysis revealed that preoperative irradiation (p = 0.04) and resection diameter (p = 0.017) accounted for the risk of complications. Eighteen additional patients were treated empirically with distant vascularized tissue transfer following preoperative irradiation because of concerns regarding potential wound complications. The lower complication rate in this group suggested that vascularized tissue transfer may be beneficial in lowering wound complication rates.
Plastic and Reconstructive Surgery, 1988
The construction details for an inexpensive, easy-to-build operating table for hand surgery have ... more The construction details for an inexpensive, easy-to-build operating table for hand surgery have been described. The table was specifically designed according to the needs of those working with it. It has been in daily use for over 2 years and has proved to be a popular product with all staff members.
Pediatric Neurosurgery, 1978
Microsurgery, 1993
The effect of different pre-existing health conditions on the resub of reconstructive microvascul... more The effect of different pre-existing health conditions on the resub of reconstructive microvascular surgery are reviewed. These conditions include: age, vital organ failure, diabetes, arterial and venous diseases, medications, smoking, wound healing disorders, epidermolysis bullosa, hematological diseases, multiple injury patients, pregnancy, and neuropsychiatric disease.
Microsurgery, 1991
Reconstructive procedures used in salvaging distal limb injuries in the dog are reviewed. Techniq... more Reconstructive procedures used in salvaging distal limb injuries in the dog are reviewed. Techniques employed to resurface the distal weight-bearing surface include local reconstruction using pedicle flap transposition of foot pads. The development of a previously described free microneurovascular digital foot pad flap is reviewed: the experimental results and potential for clinical use of the free flap are discussed.
Microsurgery, 1991
Various reconstructive techniques have been applied to the management of difficult wounds in the ... more Various reconstructive techniques have been applied to the management of difficult wounds in the dog. Wounds in the distal extremities and on the face are hard to manage by conventional methods. A free cutaneous flap, based on the superficial cervical vessels, was developed and used in a series of experimental and clinical cases. Six of eight experimental orthotopic transfers survived. The two failures were thought to be related to technical error. The seven flaps, used in clinical cases, all survived and successfully resolved the dogs' clinical problems.