Assessment of upper limb in tetraplegia: considerations in evaluation and outcomes research.INTRODUCTION
Over the past decade, efforts by participants of the International Conference on Surgical Rehabilitation of the Upper Limb in Tetraplegia tetraplegia /tet·ra·ple·gia/ (-ple´jah) quadriplegia.
paralysis of all four extremities; quadriplegia. have focused on identifying sensitive, reliable, and meaningful outcome measures of upper-limb (UL) function in tetraplegia [1-6]. Most studies on UL improvement have applied either hand assessments designed for populations other than spinal cord injury Spinal Cord Injury Definition
Spinal cord injury is damage to the spinal cord that causes loss of sensation and motor control.
Approximately 10,000 new spinal cord injuries (SCIs) occur each year in the United States. (SCI (Scalable Coherent Interface) An IEEE standard for a high-speed bus that uses wire or fiber-optic cable. It can transfer data up to 1GBytes/sec.
(hardware) SCI - 1. Scalable Coherent Interface.
2. UART. ) or activities of daily living (ADL) scales that may or may not be sensitive to changes in the hand and arm function of persons with SCI . However, the advancement in functional electrical stimulation (FES) systems and reconstructive surgical procedures and the realities of clinical trials have catalyzed an international focus on measurement issues surrounding UL evaluation in tetraplegia. Stroh-Wuolle et al. [8-9], van Tuijl et al. , and Bryden et al.  described criteria for an appropriate tool for evaluating UL function in persons with tetraplegia. Collectively, these authors agree that the criteria include (1) activities that are appropriate for persons with tetraplegia and represent their ability to perform actual ADL requiring hand function, (2) insensitivity to learning, (3) standardized administration, (4) an unambiguous scale that does not combine too many aspects of function (e.g., concurrent scoring of level of independence and time for completion), (5) multiple trials for helping ensure reliability, and (6) sensitivity to small but clinically significant changes provided by recovery, treatment, or intervention for restoring UL function.
This article reviews assessments commonly used for measuring hand and arm function in persons with SCI. ADL measures, while commonly used as indirect measures of arm and hand function, are beyond the scope of this article but have been well-described elsewhere [10-21]. The role of electrophysiological evaluation is described and emerging UL evaluative technologies are introduced. Finally, the strengths and limitations of select assessments for use in clinical trials are described.
ASSESSMENT OF MUSCLE STRENGTH AND SENSATION
International Standards for Neurological Classification of Spinal Cord Injury
The American Spinal Injury Association first published a standard system for neurological assessment and classification of SCI in 1982 . Following a decade of use, major revisions to the system were published  and adopted by the International Medical Society of Paraplegia paraplegia (pâr'əplē`jēə), paralysis of the lower part of the body, commonly affecting both legs and often internal organs below the waist. When both legs and arms are affected, the condition is called quadriplegia. (IMSOP) (now the International Spinal Cord Society). Adoption by IMSOP reflected the international SCI community's acceptance of the system as the standard for neurological assessment of persons with SCI. Most recently, Marino et al. clarified terminology related to the standards , and in their current form , the standards continue to represent the most widespread method for assessment of neurological consequence and classification of SCI.
The International Standards for Neurological Classification of Spinal Cord Injury (ISCSCI) motor and sensory examinations (exams) have been used for describing adult and pediatric pediatric /pe·di·at·ric/ (pe?de-at´rik) pertaining to the health of children.
Of or relating to pediatrics. populations with SCI [26-28]. However, unlike other aspects of SCI assessment, the motor and sensory exams have also been the primary indicators of recovery of neurological function [29-33]. For example, Waters et al. studied recovery patterns of motor and sensory functions in adults with paraplegia  and tetraplegia . Serial examination of motor and sensory functions with the ISCSCI were performed on 148 persons with paraplegia. Results showed that initial neurological motor level above thoracic level 9 (T9) was associated with poor neurological recovery at follow-up, while initial neurological motor level below T9 was associated with more favorable recovery, particularly in the muscles that straighten the hips and knees. Waters et al. also showed that recovery of sensation at follow-up was not associated with initial sensory scores . Waters et al.'s work with persons with tetraplegia showed a consistent, predictable pattern of motor recovery . For muscles with initial motor scores of grade 1 or 2, strength increased at 1-year follow-up to at least grade 3. In contrast, for the majority of the muscles with initial motor scores of grade 0 (complete paralysis), strength at follow-up never exceeded grade 3. Other researchers have studied the relationship between motor and sensory scores and bladder recovery , the recovery patterns of muscle strength and sensation in vascular injuries , and the relationship between motor scores and functional recovery [37-41].
The ISCSCI motor and sensory exams have also been used as inclusion criteria for entry into drug and device trials. While Bracken et al.'s work added additional UL muscles and variation in the scoring technique , neurological motor level was the primary outcome in their study on high-dose methylprednisolone methylprednisolone /meth·yl·pred·nis·o·lone/ (-pred-nis´ah-lon) a synthetic glucocorticoid derived from progesterone, used in replacement therapy for adrenocortical insufficiency and as an antiinflammatory and immunosuppressant; also . Also, in unpublished current clinical trials for acute and chronic SCI, motor and sensory scores and level of SCI completeness as defined by the ISCSCI are used as entry criteria and primary outcomes. Activity-based rehabilitation, a program of intensive cycling, assisted treadmill training, and swimming, also uses the ISCSCI exams as primary outcomes . Studies of FES devices have extensively used ISCSCI motor and sensory criteria as both entry criteria and outcome variables [44-48]. Limitations of the ISCSCI classification for UL assessment have been described [7,11,49]; the most notable are that it provides insufficient information on UL muscle function for effective treatment and measurement outcomes, is insensitive to the very small but clinically significant changes in hand and arm strength, and has questionable utility with children and youth.
International Classification for Surgery of the Hand in Tetraplegia
While the ISCSCI remains the most commonly used motor and sensory assessment in tetraplegia, the International Classification for Surgery of the Hand in Tetraplegia (ICSHT), an alternative classification scheme, has been introduced specifically for surgical planning in the UL in tetraplegia [2,7]. Like the ISCSCI, the ICSHT involves both examination of motor and sensory function and classification of neurological status. For the ICSHT motor exam, muscles below the shoulder are evaluated on the same ordinal scale used for the ISCSCI motor exam, except that all UL muscles are evaluated (as opposed to five key muscles with the ISCSCI) and the determining muscle strength for classification is grade 4 (as opposed to grade 3 with the ISCSCI). The ICSHT sensory exam involves testing two-point discrimination on the thumb and index finger; sensation is considered intact if two-point discrimination is [less than or equal to]10 mm. When two-point discrimination is >10 mm, persons are considered to only have ocular input for hand function. For example, as shown in the Figure, an individual classified as having a motor C5 injury by the ISCSCI could be classified into one of two motor groups by the ICSHT: group 0 or group 1. Group 0 specifies that the individual has elbow flexion flexion /flex·ion/ (flek´shun) the act of bending or the condition of being bent.
1. The act of bending a joint or limb in the body by the action of flexors.
2. as a result of biceps function but no redundant elbow flexors available for transfer to another function. Group 1 specifies that, in addition to elbow flexion from the biceps, the individual's brachioradialis muscle strength is a grade 4 and thus available for tendon transfer.
While the ICSHT was designed to aid planning of surgical reconstruction, it may be more sensitive than the ISCSCI, at least for assessment of strength, since it evaluates more key UL muscles.
Despite the strengths and international use of the ISCSCI and the ICSHT, both evaluation and classification schemes depend upon manual strength testing, which is an inadequate measure in isolation of other strength measures because of variability in scaling (ordinal (mathematics) ordinal - An isomorphism class of well-ordered sets. scales 0-5 vs ordinal scales 0-5 that include "+"), grading of strength, and limb position during testing. For muscles with a strength grade of at least 3 out of 5, hand-held dynamometry dy·na·mom·e·ter
Any of several instruments used to measure mechanical power.
[French dynamomètre : Greek dunamis, power; see dynamic + -mètre, -meter. is a useful adjunct to the manual muscle test [50-52]. May and colleagues described a break test in which the tester overcomes the strength of the person being tested and a make test in which the tester holds the dynamometer dynamometer /dy·na·mom·e·ter/ (di?nah-mom´e-ter) an instrument for measuring the force of muscular contraction.
An instrument for measuring the degree of muscular power. stable while the person being tested exerts maximum strength . Make and break techniques for hand-held dynamometry show high reliability when used for measuring elbow flexion and extension . The Jamar and Preston and the Penny and Giles instruments have been used with the tetraplegia population [50,52,55]. While isokinetic isokinetic /iso·ki·net·ic/ (-ki-net´ik) maintaining constant torque or tension as muscles shorten or lengthen; see isokinetic exercise, under exercise. dynamometry is an important measurement, it is challenging with this population because positioning the person so as to eliminate use of compensatory patterns is difficult, particularly when muscles about the shoulder and upper arm are being measured. Thus, when applying dynamometric techniques, one must pay careful attention to proper stabilization and have knowledge of typical SCI compensatory patterns, such as shoulder external rotation during attempts at elbow extension and wrist extension during attempts at finger flexion. Hand-held dynamometry is limited in acute clinical trials due to its inability to measure changes in the weakest muscles, where the most potential for change exists, but may be useful for stronger muscles against gravity.
ASSESSMENT OF HAND FUNCTION
Several generic tests of hand function, most notably the Jebsen Test of Hand Function , have been used for measuring the hand function of persons with tetraplegia [7,10]. Van Tuijl describes and applies many generic hand-function tests . Stroh-Wuolle et al. [8-9], Mulcahey et al. [57-59], and Bryden et al.  describe the limitations of generic hand-function tests when applied to persons with tetraplegia and, as a direct result of these limitations, advise against their use in SCI clinical practice and research studies.
Several evaluation tools have been developed specifically for use with persons with cervical (C)-level SCI, and although they may claim to be measures of hand function, many are actually multidimensional assessments of ADL. For example, in contrast to the Jebsen Test of Hand Function that measures grasp and release and object manipulation, the Sollerman Hand Function Test evaluates 20 ADL that require the most common types of gripping strategies . Execution of ADL requires factors beyond hand function, and thus these other factors confound the measurement of hand function. Likewise, Marino's Capabilities of the Upper Extremity (CUE) instrument  and Fattal's Motor Capacity Scale  may indirectly measure hand function but focus largely on the execution of tasks that require body movements and stability beyond hand grasp and release. The CUE  is a 17-item questionnaire in which patients rate on a 7-point ordinal scale their ability to perform functional tasks with their arms. The CUE separates proximal arm function from hand function and effectively measures outcomes after surgery for improving UL function ; Marino is currently developing and refining the CUE for use as an observational measure rather than patient report. The Motor Capacity Scale evaluates motor capacities that correspond to functional activities typical of persons with SCI regardless of contextual and environmental influences. The Tetraplegia Hand Activity Questionnaire (THAQ) is another disease-specific measure that evaluates UL function in SCI . The THAQ was developed with the Delphi Method, which resulted in the inclusion of arm-hand activities that are meaningful to SCI. Clinical applications of the THAQ have not been reported.
The Sollerman Hand Function Test, CUE, Motor Capacity Scale, and THAQ are well-designed and evaluate meaningful tasks for people with tetraplegia; at least one or a battery of several of these tools should be used in clinical practice to build evidence for interventions. These tools may also be useful in clinical trials and intervention studies with persons with chronic tetraplegia. Their application, however, in acute clinical trials may be limited.
The only measurement tool that was developed specifically for measurement of hand function (open and close, grasp and release) in persons with tetraplegia and that has addressed the limitations of generic hand tests is the Grasp and Release Test (GRT GRT Great
GRT Glimcher Realty Trust
GRT Grand River Transit (Waterloo, Canada)
GRT General Relativity Theory
GRT Group Rapid Transit
GRT Gruppo per le Relazioni Transculturali ) . The GRT measures three variables: pinch strength, grasp strength, and hand function. For the assessment of hand function, the GRT requires the person to unilaterally acquire and then carry and release five objects of varying weight and size; the "carrying" of objects does not require midline mid·line
A medial line, especially the medial line or plane of the body.
n the line equidistant from bilateral features of the head. crossing and therefore eliminates proximal contributions to function. A sixth object, the fork, is used for simulating pinching of a fork handle and stabbing of food. The number of objects successfully manipulated and the number of repetitions achieved in a 30-second trial are scored. Wuolle et al. first reported on the psychometrics of the GRT , which were further established by Mulcahey et al. . In Mulcahey et al.'s study, intraclass correlation coefficients were high for repeated GRT test measures; the GRT scores were stable over time for chronic stable hand-function measurement and were sensitive to changes in hand function via FES and tendon transfers. Clinically, the GRT has been an effective outcome measure for intervention studies of FES and tendon transfers [58,64-69]. Like all tests of hand function, the GRT requires the person to sit upright in the wheelchair; this prerequisite limits GRT use in clinical trials involving persons with acute SCI who are not medically stable for sitting. Another limitation of the GRT may be that its original intent was the evaluation of changes caused by FES lateral and palmar grasp; therefore, it may be insensitive to other grasp patterns and/or injury levels that typically do not use current FES systems (e.g., high and low cervical SCI).
Electrophysiological measures commonly performed for individuals with tetraplegia include stimulated muscle testing, strength-duration (SD) testing, evoked-potential testing, nerve conduction velocity (NCV NCV New Century Version (Bible translation)
NCV Nerve Conduction Velocity
NCV No Commercial Value (shipping)
NCV No Customs Value (shipping)
NCV New Concept Vehicle ) testing, and needle and dynamic electromyography electromyography
Process of graphically recording the electrical activity of muscle, which normally generates an electric current only when contracting or when its nerve is stimulated. (EMG EMG
A diagnostic test that records the electrical activity of muscles. ) testing. The utility of each measure, site of injury, clinical presentation, and reason for referral are considerations in the choice of electrophysiological test [70-72].
Stimulated muscle testing is the surface application of electrical stimulation to a muscle or nerve for assessment of the lower motor neuron lower motor neuron
A motor neuron whose cell body is located in the brainstem or the spinal cord and whose axon innervates skeletal muscle fibers. Also called final motor neuron. (LMN LMN
lower motor neuron. ) muscle response . The examiner determines the extent of axonal axonal
pertaining to or arising from an axon.
an axon dies and cannot be replaced if its cell body is destroyed. involvement rostral rostral /ros·tral/ (ros´tral)
1. pertaining to or resembling a rostrum; having a rostrum or beak.
2. situated toward a rostrum or toward the beak (oral and nasal region), which may mean superior (in relationships and caudal caudal /cau·dal/ (kaw´d'l)
1. pertaining to a cauda.
2. situated more toward the cauda, or tail, than some specified reference point; toward the inferior (in humans) or posterior (in animals) end of the body. to the zone of injury by assessing the quality of the LMN muscle response . Responses to stimulated muscle testing have been recorded with the interpretations defined from conventional manual muscle-testing scales . For investigators interested in detecting subtler changes in strength over time, dynamometric testing is recommended .
SD testing involves the application of direct current to a muscle or nerve through a surface probe for assessment of normal, partial, or absent innervation innervation /in·ner·va·tion/ (in?er-va´shun)
1. the distribution or supply of nerves to a part.
2. the supply of nervous energy or of nerve stimulation sent to a part. [71-72]. Plotting a curve of stimulus intensity to pulse duration (called the SD Curve) or obtaining an intensity and duration value with set instrument parameters (called Rheobase-Chronaxie) can assess the extent of innervation [71-72]. The SD Curve graphically represents the quality of innervation, while the Rheobase-Chronaxie provides a specific intensity and duration value for repeat comparison [71-72]. The magnitude of axonal involvement measured with either SD testing or stimulated muscle testing does not directly predict functional ability or performance [71-72].
NCV testing is a form of evoked-potential testing; electrical stimulus is delivered to the nerve while a sensory, motor, or sympathetic response is simultaneously recorded . This procedure is routinely performed for determining the location and magnitude of LMN involvement . EMG testing is most commonly performed with a monopolar or concentric needle to assess muscle during insertion, rest, and voluntary recruitment . When NCV testing is performed in conjunction with needle EMG testing, the clinician gains added information on the nature (axonal and/or demyelinating condition, myogenic myogenic /my·o·gen·ic/ (-jen´ik)
1. pertaining to myogenesis.
2. originating in myocytes or muscle tissue.
my·o·gen·ic or my·o·ge·net·ic
1. vs neurogenic neurogenic /neu·ro·gen·ic/ (-jen´ik)
1. forming nervous tissue.
2. originating in the nervous system or from a lesion in the nervous system. ) and magnitude of injury (extent of recruitment) .
Dynamic EMG analysis entails the application of surface or fine-wire recording electrodes for examination of electrical activity of muscle during passive or active movement [71-72]. Dynamic EMG can be used for examining the frequency components of muscle and analyze muscle contraction characteristics during select conditions or functionally meaningful tasks [71-72]. EMG signaling is often synchronized with movement data through the use of reflective markers or electrogoniometric measurement [71-72].
Previous investigators reported on electrophysiological changes that occur to peripheral and central structures following primary spinal insult [73-81]. While electrophysiological testing has been performed in SCI for predicting injury [74-75,82-85], examining the nature of neurological injury [71-72,86-92], monitoring the integrity of spinal conduction [77,93-94], and assessing for concomitant or secondary neurological conditions [95-99], its role as a method of evaluating the impact of various interventions [65-66,81-82,100-106] is the concern of this article.
Electrophysiological testing has in many cases assessed for interventions appropriate for patients with SCI [65-66,81]. Stimulated muscle testing has assessed the functional integrity of the LMN for functionally stimulated interventions [65-66,73]. While intact stimulated responses within the C7-T1 muscles are critical for successful, minimally invasive hand implantation, the clinician must consider the extent of proximal volitional control for functional use of the limb [65-66,73]. While individuals with C5- or C6-level SCI may have the option of implanted hand function, the challenge today for individuals with C4-level tetraplegia is the lack of volitional or stimulated shoulder or elbow function . A recent investigation at our facility restored either volitional or stimulated LMN function in nonfunctional and significantly denervated C5 muscles. Viable donor nerves with either volitional or stimulated function were transferred into C5 muscles with significant LMN and functional loss. While this investigation demonstrated neurological recovery in 8 of 12 procedures at 18 months follow-up, future work is needed for restoration of functional recovery.
The concept of activating a "central spinal generator" during activity-based regimens such as cycling and partial-weight-support treadmill training has been proposed . Many investigators used the H reflex as the primary neurophysiological neu·ro·phys·i·ol·o·gy
The branch of physiology that deals with the functions of the nervous system.
neu measure for monitoring changes in spinal modulation with the introduction of various activity-based regimens [103-105]. The functional significance of changes in the H-reflex response to functional ambulation am·bu·late
intr.v. am·bu·lat·ed, am·bu·lat·ing, am·bu·lates
To walk from place to place; move about.
[Latin ambul in humans has not been demonstrated [43,103-105]. A recent investigation reported on the association between H-reflex habituation habituation
Reduction of an animal's behavioral response to a stimulus, as a result of a lack of reinforcement during continual exposure to the stimulus. Habituation is usually considered a form of learning in which behaviours not needed are eliminated. and reduced spasticity spasticity /spas·tic·i·ty/ (spas-tis´i-te) the state of being spastic; see spastic (2).
1. A spastic state or condition.
2. Spastic paralysis. in patients following passive cycling . Further work is needed for the full development of H-reflex testing as a reliable evaluation of interventions targeted at the central spinal generator.
Kinesiological EMG may be another valuable electrodiagnostic tool for UL assessment in persons with tetraplegia. Kinesiological EMG has examined differences in shoulder recruitment during simulated wheelchair propulsion . Persons with tetraplegia demonstrated greater vertical shoulder forces coupled with reduced shoulder-depressor strength compared with persons with paraplegia . Persons with tetraplegia rely on proportionally greater anterior deltoid deltoid /del·toid/ (del´toid)
2. the deltoid muscle.
1. Of or relating to the deltoid muscle.
2. activity when attempting to perform a pressure-relief maneuver [97,107-108]. This finding contrasted with persons with typical shoulder muscular innervation who relied on the pectoralis major, latissimus dorsi la·tis·si·mus dor·si
A muscle with origin from the spinous processes of the lower thoracic and lumbar vertebrae, the median ridge of the sacrum, and the outer lip of the iliac crest, with insertion into the humerus, with nerve supply from the , and triceps triceps, any muscle having three heads, or points of attachment, but especially the triceps brachii at the back of the upper arm. One head originates on the shoulder blade and two on the upper-arm bone, or humerus. .
The pattern of kinesiological EMG muscle activity following C6-level SCI was analyzed during four common ADL and a select weight-lifting activity . Subjects with tetraplegia required greater relative EMG activation for a 2 kg weight, while little difference was found versus controls for each of the four ADL . When subjects attempted to increase their shoulder elevation beyond their normal workspace, a relative increase in EMG activity (anterior deltoid, supraspinatus, infraspinatus, and scapular scap·u·lar or scap·u·lar·y
Of or relating to the shoulder or scapula.
adj pertaining to the region of the scapulae.
pertaining to the scapula. muscles) was found versus controls . These studies suggest that kinesiological EMG may potentially evaluate the small but clinically important differences in muscle activity in SCI. To date, we are unaware of a kinesiological investigation in tetraplegia that has examined differences in muscle activation patterns in relation to performance on the GRT, Sollerman Hand Function Test, CUE, Motor Capacity Scale, or THAQ.
CONSIDERATIONS FOR CLINICAL TRIALS AND OUTCOME STUDIES
The UL function of persons with tetraplegia plays a pivotal role in the degree to which they can spontaneously and effortlessly participating in self-selected activities; this basic premise has been a primary assumption in the development of SCI-specific hand-function tests. Relatively speaking, however, little work has focused on the development and use of a universally accepted method of measuring the UL of persons with tetraplegia across the care (acute to chronic) and age (pediatric to geriatric) continuums. Lack of a UL assessment tool is a major barrier to research on and evidence-building for UL interventions in SCI .
Clinical trials involving acute interventions enroll persons who may not be medically stable and are therefore unable to sit; hand-function tests require sitting endurance. Therefore, hand-function tests are inappropriate for clinical trials during the acute phase of SCI. However, measures of strength and perhaps electrodiagnostics can be used in acute clinical trials. Strength-testing all UL muscles and classifying the UL according to both the ISCSCI and ICSHT are recommended. ICSHT is more sensitive to the UL in tetraplegia and has greater clinical significance than the ISCSCI. Electrodiagnostic measures may provide a method of monitoring neurological changes over time and may be an important adjunct to manual strength testing; further development and validation of these techniques are warranted.
Once a person with tetraplegia is able to sit, the GRT is a good tool for evaluating hand function and should be considered a primary measurement tool in clinical trials involving persons outside the acute-care phase and for outcome studies of UL orthoses, FES, and reconstructive procedures. With the exception of the Freehand See Macromedia FreeHand. clinical trial , the usefulness of the GRT in clinical trials is unexplored. While the GRT indirectly measures hand function, the CUE provides a functional perspective that, combined with the GRT, provides information on overall UL function. In the future, an observational CUE will be available that may strengthen this measure's utility. While measures of ADL were not discussed, they, too, indirectly measure UL function. Last, computer-adaptive testing platforms likely will provide precision and meaningful outcomes data in the near future .
Ideally, a measurement scheme based on the International Classification of Functioning, Disability, and Health model  as described by Sinnott et al.  would contribute greatly to the understanding of the impact of UL recovery and interventions on impairment, activity, and participation.
This article briefly discussed several measurement tools for evaluating the UL of persons with tetraplegia. While muscle strength testing and electrodiagnostics can be useful measures in acute clinical trials and outcomes studies, standardized measures of hand function are difficult because they require a sitting balance and endurance that many people with acute tetraplegia simply do not have. Acute trials should incorporate the ICSHT motor and sensory exam and classification system in addition to the ISCSCI and should consider the role of electrodiagnostics. The GRT, coupled with other indirect measures of UL function, is recommended for clinical trials involving persons with chronic SCI. Obviously, much work remains in the development, validation, and deployment of an assessment of the UL in persons with SCI that will be useful for clinical trials and outcomes research.
This material is the result of work supported with resources and the use of facilities at the Shriners Hospitals for Children History
Shriners Hospitals for Children is a network of 22 pediatric non-profit hospitals across North America that provide all care at no charge. In 1920 the Imperial Session of the Shriners was held in Portland, Oregon. , Philadelphia, Pennsylvania.
The authors have declared that no competing interests exist.
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Abbreviations: ADL = activities of daily living, C = cervical, CUE = Capabilities of the Upper Extremity, EMG = electromyography, FES = functional electrical stimulation, GRT = Grasp and Release Test, ICSHT = International Classification for Surgery of the Hand in Tetraplegia, IMSOP = International Medical Society of Paraplegia, ISCSCI = International Standards for Neurological Classification of Spinal Cord Injury, LMN = lower motor neuron, NCV = nerve conduction velocity, SCI = spinal cord injury, SD = strength-duration, T = thoracic, THAQ = Tetraplegia Hand Activity Questionnaire, UL = upper limb.
MJ Mulcahey, PhD, OTR/L OTR/L Occupational Therapist, Registered, Licensed ; * Dave Hutchinson, MS, PT; Scott Kozin, MD
Shriners Hospitals for Children, Philadelphia, PA
* Address all correspondence to MJ Mulcahey, PhD, OTR/L; Shriners Hospitals for Children, Philadelphia Hospital, 3551 North Broad Street, Philadelphia, PA 19140; 215-430-4081; fax: 215-430-4123. Email: firstname.lastname@example.org DOI (Digital Object Identifier) A method of applying a persistent name to documents, publications and other resources on the Internet rather than using a URL, which can change over time. : 10.1682/JRRD.2005.10.0167