Douglas T. Hutchinson

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PURPOSE It is not known whether motor and sensory pathways associated with a missing or denervated limb remain functionally intact over periods of many months or years after amputation or chronic peripheral nerve transection injury. We examined the extent to which activity on chronically severed motor nerve fibers could be controlled by human amputees and(More)
A rhesus monkey was trained to perform individuated and combined finger flexions of the thumb, index, and middle finger. Nine implantable myoelectric sensors (IMES) were then surgically implanted into the finger muscles of the monkey's forearm, without any adverse effects over two years postimplantation. Using an inductive link, EMG was wirelessly recorded(More)
BACKGROUND Despite the good results that are usually reported after fixation at the sites of olecranon fractures and osteotomies, problems such as loss of fixation, nonunion, and the need for revision surgery are still encountered. Various types of fixation have been recommended, but few have been evaluated with use of clinically relevant cyclic load(More)
Bone loss due to thermonecrosis may weaken the purchase of surgically placed screws and pins, causing them to loosen post-operatively. The goal of this study was to determine how differences in applied drilling forces affect the temperature of cortical tissue near the drilling site. Results from thermocouples placed into fresh cortical bone indicate that(More)
The purpose of this study was to define the proximal ulna anatomy with respect to olecranon osteotomy and fracture fixation. Thirty-nine cadaver elbows were dissected. The mean ulnar length (triceps insertion to ulnar styloid) was 26.0 cm (range, 27.1-29.0 cm). The mean distance from the triceps insertion to the ulna's varus angulation point was 7.6 cm(More)
90 unstable fractures of the distal radius were studied in a randomized, prospective manner. Follow-up consisted of patient questionnaire, medical record review, therapist evaluation and radiography at 4 months, 1 year and 2 years post-operatively. Overall results were good or excellent in 94%. No significant differences were found between treatment groups(More)
Peripheral nerve interfaces that can record from and stimulate large numbers of different nerve fibers selectively and independently may help restore intuitive and effective motor and sensory function after hand amputation. To this end, and extending previous work in two subjects, two 100-electrode Utah Slanted Electrode Arrays (USEAs) were implanted for(More)
The purpose of this study was to review the Compass Universal Hinge dynamic elbow external fixator in pediatric conditions. Eight patients with diagnoses of ulnar club hand (n = 2), proximal radial synostosis with hypoplastic coronoid (n = 1), pterygium cubitale (n = 2), and elbow arthrofibrosis (n = 3) were identified. Indications for fixator placement(More)
Trans-radial amputee subjects were implanted with intrafascicular electrodes in the stumps of the median and ulnar nerves. Electrical stimulation through these electrodes was used to provide sensations of touch and finger position referred to the amputated hand. Two subjects were asked to identify different objects as to size and stiffness by manipulating(More)
The purpose of this study was to examine the behavior of ganglia of the hand and wrist in young children treated without surgery. Fourteen consecutive children, less than 10 years of age, who presented with cysts of the hand and wrist were followed up by a single surgeon. The average age of the patient at the time of diagnosis was 38 months (range, 2 months(More)