- Open Access
Upper limb kinematics after cervical spinal cord injury: a review
Journal of NeuroEngineering and Rehabilitation volume 12, Article number: 9 (2015)
Although a number of upper limb kinematic studies have been conducted, no review actually addresses the key-features of open-chain upper limb movements after cervical spinal cord injury (SCI). The aim of this literature review is to provide a clear understanding of motor control and kinematic changes during open-chain upper limb reaching, reach-to-grasp, overhead movements, and fast elbow flexion movements after tetraplegia. Using data from MEDLINE between 1966 and December 2014, we examined temporal and spatial kinematic measures and when available electromyographic recordings. We included fifteen control case and three series case studies with a total of 164 SCI participants and 131 healthy control participants. SCI participants efficiently performed a broad range of tasks with their upper limb and movements were planned and executed with strong kinematic invariants like movement endpoint accuracy and minimal cost. Our review revealed that elbow extension without triceps brachii relies on increased scapulothoracic and glenohumeral movements providing a dynamic coupling between shoulder and elbow. Furthermore, contrary to normal grasping patterns where grasping is prepared during the transport phase, reaching and grasping are performed successively after SCI. The prolonged transport phase ensures correct hand placement while the grasping relies on wrist extension eliciting either whole hand or lateral grip. One of the main kinematic characteristics observed after tetraplegia is motor slowing attested by increased movement time. This could be caused by (i) decreased strength, (ii) triceps brachii paralysis which disrupts normal agonist–antagonist co-contractions, (iii) accuracy preservation at movement endpoint, and/or (iv) grasping relying on tenodesis. Another feature is a reduction of maximal superior reaching during overhead movements which could be caused by i) strength deficit in agonist muscles like pectoralis major, ii) strength deficit in proximal synergic muscles responsible for scapulothoracic and glenohumeral joint stability, iii) strength deficit in distal synergic muscles preventing the maintenance of elbow extension by shoulder elbow dynamic coupling, iv) shoulder joint ankyloses, and/or v) shoulder pain. Further studies on open chain movements are needed to identify the contribution of each of these factors in order to tailor upper limb rehabilitation programs for SCI individuals.
Cervical spinal cord injury (SCI) leads to extensive sensorimotor deficits affecting both somatic (e.g. upper and lower extremity, trunk) and vegetative functions below the injury level . A C5 SCI preserves innervation of shoulder and elbow flexors while C6 injuries spare wrist extensors and C7 injuries spare elbow extensors in addition (see Table 1). Thus, from a functional perspective, C5 and C6 injuries impair active elbow extension against gravity while C5 to C7 injuries prevent active grasping . Fortunately, when wrist extension is preserved (i.e. injury at C6 or below), tenodesis can replace active grasp by passive whole hand and lateral grips. During wrist extension tenodesis causes passive tendon shortening of flexor digitorum superficialis and profundus, leading to passive finger-to-palm flexion, and of flexor pollicis longus, leading to thumb-to-index lateral face adduction .
Autonomy after tetraplegia is based upon upper limb movements and is achieved by both re-learning open-chain movements like grasping, and learning novel closed-chain movements like manual wheelchair propulsion or sitting pivot transfer. This is achieved by rehabilitation [1, 2] and can be complemented by surgical tendon transfer which involves transferring a tendon from a spared muscle (i.e. one with a score above 4/5 at manual muscle testing) to that of a paralyzed muscle [5, 6]. If triceps brachii is paralyzed, the aim of the surgery is to restore active elbow extension, otherwise its aim is to restore active grasping [7–10].
Clinical assessments are typically used to document upper limb function as well as rehabilitation- or surgery- related improvements , but these tests are often subjective and less sensitive than kinematic recordings [12, 13]. Thus, to better characterize upper limb movements, kinematic tests have been developed based on reach-to-grasp [14, 15], drawing lines , overhead movements like shoulder flexion and abduction , wheelchair propulsion , or sitting pivot transfer [19, 20]. Kinematics have also been used to demonstrate intervention-related improvements in upper limb movements after C6 tetraplegia with  and without  tendon transfer.
Open-chain movements can be programmed and performed in different ways . By examining these movements (that have to be re-learned after injury), SCI provides the opportunity to test theories of motor control [17, 24–28], as individuals with SCI should be able to plan movements despite having fewer degrees of freedom to execute them. Although a number of upper limb kinematic studies have been conducted, to date there are no reviews dedicated to addressing the key-features of open-chain movements after cervical SCI. The aim of this paper is to provide such a review, with particular emphasis on the modified kinematics of upper limb movements after tetraplegia.
We consulted the U.S. National Library of Medicine® (MEDLINE) between 1966 and December 2014. We included full texts from peer-reviewed journals describing kinematics of upper limb movements in alive individuals with complete motor tetraplegia (i.e. AIS scores A and B). We included series case studies of open-chain upper limb movements without extra-load and excluded studies on human cadavers, single cases, and closed-chain upper limb movements.
We examined temporal kinematic parameters including movement time (MT), peak velocity (PV), time to peak velocity (TPV), peaks of acceleration and deceleration, number of PV, acceleration and deceleration peaks. We examined spatial parameters such as trajectory, hand height, joint motion, endpoint accuracy, displacement errors, and joint coordination. We also considered kinematic characteristics after surgery for restoration of elbow extension, and when available, characteristics of physiological recordings e.g. electromyographic activity.
We found 24 articles in the database and identified one additional study after reading the references of the 24 articles . We thus examined 25 articles and rejected 7 of these 25 since they did not fulfill at least one of the inclusion criteria: incomplete lesions (AIS D) ; single case-study [21, 22]; no kinematic recordings [30–32]; human cadavers . The 18 included studies addressed modifications in upper limb motor control during (i) reaching [3, 24–27, 34–36], (ii) reach-to-grasp [3, 14, 15, 29, 35, 37] and (iii) overhead movements such as shoulder flexion or abduction [17, 38–41]. One study focused on kinematics during fast elbow flexion .
The selected studies included a total of 164 SCI participants with complete motor deficit after injury and 131 healthy controls. Injury level was between C4 and C8. Only one study included high thoracic SCI between T1 and T4  (see Figure 1 and Table 2).
In all studies, the SCI participants sat in their wheelchair while control participants, when included, sat on a standard chair. One study provided no information about trunk stabilization , but in all other studies a strap stabilized the chest to the back of the seat except in two studies [34, 37] where the trunk had no restriction for anterior motion. Systems used to record 3D motion were electromagnetic, electro-goniometric, optoelectronic, or videographic (see Table 2).
After C5 to C7 SCI MT increased [3, 25–27, 35], PV decreased [3, 24, 26, 27, 34, 35], but TPV was similar to that of control participants [3, 26, 27]. Compared with control participants, PV was approximately 30% lower and MT more than 40% slower (see Table 3). After C6 and C7 SCI the velocity profiles of the hand and fingers remained bell-shaped [3, 24, 25, 35]. After C6 SCI variability in PV increased , the magnitude of the maximum acceleration and deceleration peaks was reduced and there were multiple acceleration peaks  (see Tables 3 and 4).
After C5 to C7 SCI elbow, hand, and finger trajectories remained straight and smooth [25, 35]. Movement amplitude with the upper limb fully extended was reduced during maximal reaching in the superior and medial workspace . After C6 and C7 SCI the pattern of joint rotation was similar to that of healthy participants [24, 25], with an increase in hand height when the target was placed on the table at elbow height [3, 24, 35], a decrease in acromion displacement [34, 35], and preserved endpoint accuracy [3, 24, 25, 27]. Shoulder and elbow joint motion followed a linear relationship attesting to the preservation of temporal coordination [24, 35]. After C6 SCI scapula movements increased  with more lateral scapula rotation during reaching in the lateral workspace than in healthy participants . Scaling between shoulder and elbow rotation velocity was also preserved . After C7 SCI finger trajectory variability increased  (see Table 4).
After C6 SCI agonist muscles were not activated in a reciprocal pattern as in healthy individuals. Instead, shoulder muscles were almost exclusively active [25, 43], and pectoralis major (a shoulder agonist) was active throughout the entire movement, whereas in controls it was active for only part of the movement  (see Table 4).
Effect of elbow extension restoration
After tendon transfer in C5 to C7 SCI a slight increase in shoulder flexion and maximal height reached in the superior and medial directions was reported, but these changes did not reach significance .
After C6 and C7 SCI MT increased [3, 14, 35, 37] and PV decreased [3, 14, 29, 35]. When compared with control participants, MT was nearly twice as long and PV was around 11% lower (see Table 3). Due to the longer MT, TPV was delayed [3, 14], but occurred earlier than in control participants when normalized to MT . Several studies reported that in SCI participants there was an additional velocity peak between the go and return peaks in the reaching phase [29, 35, 37]. Interestingly, in one of these studies PV was negatively correlated with ASIA motor index . After C6 SCI variability in PV increased  and the velocity profile was asymmetric, with a prolonged deceleration phase [3, 35]. During reaching before grasping, velocity of shoulder flexion, elbow extension, and wrist tangential velocity were stable (the latter was equal to 20% of its maximum)  (see Tables 3 and 5).
After C6-C7 SCI the pattern of joint rotation was similar to that of control participants [14, 37], but hand height increased at the end of the reaching phase [3, 29, 35]. Index finger trajectory variability increased and was negatively correlated with the Functional Independence Measure score . The range of motion at the wrist joint during reaching was greater than in control participants [3, 14, 29], with the wrist flexed during reaching [3, 14, 15, 29] and extended during grasping and object manipulation [3, 14, 15, 29]. Motion at the shoulder and elbow joints was linearly correlated, attesting to preserved temporal joint coordination [14, 29, 35], but motion at the shoulder and wrist joints was temporally desynchronized . After C6 SCI scapula movements increased during reach to grasp [15, 35] while the acromion trajectory was shorter and less linear . During tenodesis, wrist extension angle was greater for lateral than whole hand grip  (see Table 5).
After C6 SCI MT increased and shoulder velocity decreased . After C6 to C8 SCI wrist flexion velocity decreased  while elbow velocity remained unchanged [17, 40]. PV was almost half that of control participants, and MT nearly one and a half times slower (see Tables 3 and 6).
After C5 to C7 SCI participants presented less linear in hand trajectory and larger shoulder and elbow joint rotations than healthy controls . After C5 to C8 SCI active shoulder flexion angle decreased while abduction angle increased compared with healthy controls [17, 40, 41]. After C5 and C6 SCI, the scapula was located more medially and exhibited ‘winging’ i.e. protrusion of the lower and medial parts from the thorax in the resting position. During shoulder flexion, there was less lateral rotation of the scapula for SCI individuals compared with controls . After C6 SCI passive range of motion decreased during shoulder flexion (133°, SD = 9°) and abduction (133°, SD = 10°)  compared with healthy individuals (flexion = 156°, SD = 9° and abduction = 161°, SD = 11°) . Movements of the glenohumeral joint were linearly related to both elbow and scapulothoracic joint movements attesting to preservation of temporal coupling [17, 41]. After C7 and C8 SCI, forward and upward displacement of the shoulder increased  (see Table 6).
After C6 SCI shoulder and elbow maximal isometric strength decreased . Shoulder internal and external rotator strength decreased by 67% and 39% of control capacity, respectively , and contraction intensity increased  (see Table 6).
Effect of elbow extension restoration
Elbow extension restoration after C6 SCI altered kinematics towards patterns observed in control participants as it reduced prolonged MTs , and increased shoulder flexion angle, which in turn decreased shoulder abduction angle and scapula lateral rotation  (see Table 6).
Effects of extensor impairment on elbow flexion
Only one study analyzed the accuracy of fast, single-joint elbow flexion of either 10°, 20° or 30° with and without a constant extensor torque provided by a manipulandum . After C5 SCI the maximal isometric strength of elbow flexors was about 50% of controls (mean 46.3 Nm versus 78 Nm). Without elbow extensor torque, movements were smooth but slower than in controls, and there were more errors. In contrast, movement velocity increased and errors decreased when elbow extensor torque was provided.
Individuals with SCI can relearn open-chain movements despite reduced degrees of freedom and even though the kinematics of these movements differ from those of normal controls they preserve several kinematic invariants like movement endpoint accuracy and minimal cost.
Partial motor preservation after SCI
Markers placed on either the fingers, wrist, elbow or acromion revealed preserved trajectories after C5 to C8 SCI during both reaching and reach-to-grasp [24, 25, 28, 35], attesting to the fact that SCI participants can produce efficient smooth trajectories similar to controls during reaching [25, 35] and reaching-to-grasp . TPV and the shape of the velocity profiles [3, 26, 27] along with reaching accuracy (attesting to endpoint accuracy [3, 24, 25, 27]) were comparable with controls during reaching but not during reach-to-grasp and overhead movements. Indeed, motor control after SCI is characterized by strong kinematic invariants like movement endpoint accuracy and movement cost reduction as attested by the smooth trajectories and bell-shaped velocity profiles . The relative preservation of these kinematic features is due to compensatory mechanisms, in particular during grasping and overhead movements as developed below.
Shoulder and elbow coordination after SCI
Notwithstanding the overall reduction of degrees of freedom for the upper limb, SCI individuals show patterns of shoulder and elbow coordination similar to healthy individuals during reaching and reach-to-grasp [14, 24, 25, 39]. That is, the linear temporal relationship [24, 35] and the velocity coupling  between these joints are preserved, but at the cost of other reorganizational changes. The main change occurs at the scapulothoracic joint, where scapula rotation increases during reaching  and reach-to-grasp [15, 35], and both upward and external scapula rotations increase [15, 40] in order to orient and stretch out the upper limb . A complementary change occurs at the glenohumeral joint, where increased abduction mitigates the reduced flexion during overhead movements . These scapulothoracic and glenohumeral joint compensatory movements ensure that mechanical dynamic interactions between the shoulder and elbow produce elbow extension despite triceps brachii paralysis .
Reduction of the upper limb workspace after SCI
SCI leads to extensive sensorimotor deficits, for example, strength loss due to partial innervation (see Table 1) which leads to a decrease in full shoulder active range of motion (i.e. reduced shoulder flexion and abduction angles [17, 38, 41]) and a reduction of scapula lateral rotation . Several complementary hypotheses have been put forward to account for the reduction of the superior and superiomedial reaching workspace in C5 and C6 SCI individuals. One idea is that a strength deficit in the glenohumeral joint agonist could perturb these movements. Indeed, partial denervation of the pectoralis major (normal innervation C5-T1) results in decreased strength of the primary humeral adductor . Increased EMG contraction intensity after SCI  might be a marker of the difficulty associated with these movements. A second idea is that a proximal deficit in serratus anterior (normal innervation C5-C7) means that this muscle cannot resist against the tension of the rhomboids antagonist muscles (normal innervation C4-C5) which results in both a reduction in scapula lateral rotation and in scapulothoracic instability. This could decrease the shoulder’s full active range of motion . A third idea is that a distal deficit of the triceps brachii (normal innervation C7-T1)  might force C5-C6 SCI individuals to reduce overhead workspace in order to keep the elbow extended and to maintain the mechanical dynamic interaction between the shoulder and elbow. Fourth, shoulder ankylosis could reduce superiomedial and superior reach by reducting passive full range of motion by about 25° during both shoulder flexion and abduction compared with healthy individuals [38, 44]. A final factor is shoulder pain, which is reported by more than half of the individuals with tetraplegia , and probably contributes to the functional limitation of the workspace.
Main temporal kinematic difference after SCI: prolonged movement time
The main consequence of SCI is increased MT [3, 14, 17, 25, 28, 35] which is associated with decreased PV [3, 14, 24, 28, 29, 35]. Acceleration and deceleration peaks are lower during reaching  and shoulder velocity decreases during overhead movements . Motor slowing might be due to shoulder and elbow muscle strength decreases [28, 38], as SCI participants with weaker preserved upper limb muscles exhibit lower velocity and acceleration peaks and increased MTs. Importantly, motor slowing could also be due to triceps brachii paralysis which prevents agonist–antagonist co-contraction, which is observed in healthy individuals and serves to stop movement [25, 43]. Indeed, elbow flexion velocity decreases when triceps brachii is paralyzed but can be increased when a manipulandum provides a constant extensor torque . Moreover, elbow stiffness due to impairment of agonist–antagonist co-contraction probably contributes to the alteration of reaching movements . According to Fitt’s law and the speed-accuracy trade-off principle, motor slowing could reflect central adaptation to maintain accuracy at levels similar to those of healthy individuals . This is consistent with the observation of reduced accuracy during fast elbow flexion movements . Furthermore, grasping is the main cause of increased MT , as MT is nearly twice that of controls during grasping but only one and a half times longer during reaching and overhead movements (see Table 3). It is noteworthy that the reduction of MT is not related to the need to avoid trunk imbalance since trunk support did not increase velocity during fast upper limb movements .
Requirements of grasping
Jeannerod described the transport and grasping phases of reach-to-grasp  and studies of the former phase classically used reaching movements. SCI and healthy individuals exhibit similar reaching movements, which favors the partial motor compensation previously discussed. Kinematic differences appear during grasping, however, with prolonged deceleration of the transport phase as attested by (i) delayed TPV [3, 14, 37], (ii) asymmetric velocity profile of both the hand and fingers [3, 35], and (iii) stable shoulder flexion, elbow extension and wrist tangential velocity before grasping . These differences reflect the modification of the duration of the transport and grasping phases as the transport phase is initially quick but slows down towards the end . Indeed, after SCI the transport phase of reach-to-grasp is characterized by reduced acceleration and prolonged deceleration durations, favoring final hand adjustment and successful grip. Finally, maximal grip aperture, a sign of grip preparation during transport , is lost because of finger extensor paralysis. Since grip aperture is passive and relies on wrist flexion and elbow pronation (favoring finger opening with gravity), grip preparation is effective only if the size of the object to be grasped is less than the maximal achievable grip width.
Grasping phase: tenodesis grasp
Wrist extension is a key-component of tenodesis grasp [3, 14, 15, 29]. Indeed, wrist extension and tendon shortening  lead to two passive grips: whole hand and lateral grip. In SCI participants wrist extension is greater during lateral than whole hand grip, suggesting a greater need for tendon shortening during lateral grip . Increased hand height during reach-to-grasp brings the hand above the object thus preventing collision, and could explain EMG contraction intensity increases . Joint coupling during tenodesis grasping is different from that observed in healthy individuals. Specifically, SCI individuals plan transport and grasping phases consecutively and the second velocity peak during grasping demonstrate a second movement following reaching [29, 35]. The negative correlation between the number of velocity peaks and the ASIA motor index indicates that the higher the SCI level the more fragmented the movement . Finally, reaching and grasping are successively planned after C6-C7 SCI as attested by the wrist flexion during transport but the wrist extension during grasping [3, 14, 15, 29], and the loss of temporal coupling between the shoulder and wrist during reach-to-grasp . This contrasts with normal reach-to-grasp where the grip is prepared during the transport phase .
Effect of elbow extension restoration
Restoration of elbow extension, either by tendon transfer surgery from posterior deltoid to triceps brachii[17, 26] or the use of a manipulandum that provides an extensor torque , decreases MT [17, 26, 28] and reduces errors . This is due to the restoration of elbow stiffness which in turn decreases the need for glenohumeral compensatory movements during overhead movements. Specifically, the shoulder abduction angle decreases favoring flexion  while the shoulder joint velocity concomitantly increases . Surgery also improves strength and general performance, and participants report high satisfaction after their operations . Although functional improvements are reported, surgery fails to completely restore motor function  as shown by the absence of improvements during both superior and medial maximal reaching .
SCI participants efficiently execute a broad range of upper limb tasks. Kinematic evidence shows that, even after SCI, movements are planned and executed according to strong kinematic invariants like movement endpoint accuracy and minimal cost. Elbow extension with a weak or paralyzed triceps brachii relies on increased movements of the scapulothoracic and glenohumeral joints. This provides a dynamic coupling between the shoulder and elbow which palliates the triceps brachii paralysis but limits the superior maximal reach. Moreover, reach-to-grasp planning is modified with reaching and grasping performed successively contrary to normal grasping patterns where grasping is prepared during the transport phase. The prolonged transport phase ensures correct hand placement while the grasping relies on wrist extension eliciting either whole hand or lateral grip. One main kinematic characteristic after tetraplegia is motor slowing attested by increased MT which can be a direct consequence of the strength deficit or due to a behavioral adaptation in order to preserve the accuracy of the movement and ensure grasping by tenodesis. Another issue concerns the reduction of maximal superior reaching during overhead movements. This can be caused by a strength deficit of either shoulder agonist or synergic muscles along with shoulder ankylosis and pain. Moreover, increased shoulder movements could favor shoulder pain, especially since this joint is already under severe strain. This could promote shoulder overuse pathologies which lead to pain and ankylosis, which then further contribute to the impairment. Indeed, further studies on open chain movements are needed to identify the contribution of each of these previous reasons in order to tailor upper limb rehabilitation programs for SCI individuals.
Spinal cord injury
- C5/6/7/8 and T1/2:
Cervical and thoracic vertebra indicating the level of spinal cord injury
American Spinal Injury Association
ASIA Impairment Scale
United States of America
Time to peak velocity
Newton per meter.
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This research was supported by grant from Hospital Clinical Research Program (PHRC) 2010-541/142.
The authors declare that they have no competing interests.
SM addressed the electronic database MEDLINE. Then, SM ARB YR and GR analysis and interpret the data. SM drafting the manuscript and ARB YR GR and CC revised it critically. All authors read and approved the final manuscript.
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Mateo, S., Roby-Brami, A., Reilly, K.T. et al. Upper limb kinematics after cervical spinal cord injury: a review. J NeuroEngineering Rehabil 12, 9 (2015) doi:10.1186/1743-0003-12-9
- Upper limb