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 Table of Contents  
ORIGINAL ARTICLE
Year : 2018  |  Volume : 1  |  Issue : 2  |  Page : 65-71

Gait among patients with myotonic dystrophy type 1: A three-dimensional motion analysis study


1 PMR Unit, University Hospital of Lille, Research Unit 4488 Health, Physical Activityand Muscle, University of Lille, F-59000 Lille Cedex, France
2 Rehabilitation and Physical Medicine Unit, Avenue Mounier, 53 – UCL 5375, 1200 Brussels, Belgium
3 Neuromuscular Disease Center, Saint-Luc Hospital, 1200 Brussels, Belgium
4 Neurorehabilitation Unit, Lille University Hospital, F-59000 Lille; Inserm U 1171, Degenerative and Vascular Cognitive Disorders, University of Lille, F-59045 Lille, France

Date of Web Publication11-Jan-2019

Correspondence Address:
Vincent Tiffreau
PMR Unit, University Hospital of Lille, Rue du Pr Verhaegue, F-59037 Lille Cedex
France
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijprm.ijprm_8_18

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  Abstract 


Objective: The objective was to characterize the gait abnormalities in myotonic dystrophy type 1 patients. Material and Methods: Outcomes variables were kinematic and kinetic parameters, timing of muscles, mechanical work and energy cost, and the motor function measure. Results: Despite a high cadence and a low ankle range of motion ratio, ankle extension power, and first extension moment of the knee during the stance, the mechanical work and energy cost were normal. The duration of electromyography activation of the gastrocnemius lateralis (GL) muscle was abnormally long. Conclusion: The hypothesis of a myotonic activity of the GL during the swing phase should be investigated.

Keywords: Electromyography, gait analysis, kinematics, kinetics, myotonic dystrophy type 1, treadmill


How to cite this article:
Tiffreau V, Detrembleur C, Van Den Bergh P, Renders A, Kinet V, Thevenon A, Allart E, Lejeune T. Gait among patients with myotonic dystrophy type 1: A three-dimensional motion analysis study. J Int Soc Phys Rehabil Med 2018;1:65-71

How to cite this URL:
Tiffreau V, Detrembleur C, Van Den Bergh P, Renders A, Kinet V, Thevenon A, Allart E, Lejeune T. Gait among patients with myotonic dystrophy type 1: A three-dimensional motion analysis study. J Int Soc Phys Rehabil Med [serial online] 2018 [cited 2019 Apr 25];1:65-71. Available from: http://www.jisprm.org/text.asp?2018/1/2/65/249857




  Introduction Top


Myotonic dystrophy type 1 (DM1, also known as Steinert's disease) is the most prevalent hereditary neuromuscular disease (NMD) in Western countries.[1],[2] The condition's muscle-related symptoms include distal and axial muscle weakness and myotonia (residual resistance after muscle contraction that is attributed to a decrease in membrane chloride permeability).

The genetic defect underlying DM1 is an unstable, expanded CTG triplet repeat in the untranslated region of the dystrophia myotonica protein kinase (DMPK) gene on chromosome 19.[3] Recent molecular genetic studies have described the impact of the CUG repeats in the DMPK transcripts on the biogenesis of several mRNAs, which cause the polymorphic symptoms in DM1. It has been shown that RNA inclusions in the nuclei of patients with DM1 interfere with splicing of the chloride channel 1 gene (CLCN1) mRNA. This leads to the abnormal inclusion of CLCN1's alternative exons 6B and/or 7A and retention of intron 2.[4] The end result is abnormally high membrane resistance for CLC-1, which has been correlated with the electrical hyperexcitability of muscle fibers and therefore myotonia.[5]

Although the myotonia is typically noted in the hand muscles of DM1 sufferers, it is not usually described in leg muscles. Nevertheless, Logigian et al. showed that waxing–waning myotonia occurred in distal leg muscles of patients with DM1.[6]

Patients with DM1 suffer from gait impairments and have an increased risk of falls.[7] The gait impairment in DM1 has been attributed to distal muscle weakness and impaired balance.[8] Mechanisms such as peripheral neuropathy and central nervous system dysfunction have also been suspected.[9],[10]

In 1996, Wright et al. provided the first report on gait in DM1 (in five participants).[11] The researchers showed that gait abnormalities in DM1 were related to distal weakness and the excessive use of hip muscles.

Galli et al. analyzed the gait parameters of ten DM1 patients. In addition to the expected distal muscle weakness, the researchers also observed abnormal muscle activation in the distal leg muscles during gait.[10] Bachasson et al. observed that the center of pressure (CoP) velocity was greater in DM1 patients than in healthy controls and correlated with neck flexion and ankle plantar flexion weakness.[12] Radovanović et al. showed that temporal and stride characteristics were altered in DM1 and DM2 compared to healthy controls.[13] Since previous studies have probably not elucidated all the gait abnormalities in DM1, we decided to assess gait in a group of DM1 patients. Our study included a functional assessment and a three-dimensional (3D) motion analysis (including kinematic, kinetic, and mechanical parameters, electromyography [EMG], and energy cost). Hence, the objectives of the present study were to (i) characterize gait abnormalities in a population of patients with DM1 and (ii) analyze the relationship between gait variables and functional impairment. The results should allow an improvement of the rehabilitation interventions.

Preliminary results of this study were presented at the Biomechanical Society Congress in Toulouse (France) in October 2012 and published in a short report.[14]


  Materials and Methods Top


Participants

The study participants were all affected by DM1 and had a confirmed molecular diagnosis (>50 CTG repeats) aged from 14 to 53 years. They were recruited from the NMD outpatient center at Saint-Luc University Hospital (Brussels, Belgium). The participants had to be able to walk at least 100 m without assistance and were not included in the study if they presented any of the following criteria: inability to walk on the treadmill, damage to the central nervous system or musculoskeletal system that could affect the person's ability to walk, and finally, pregnancy.

A total of 15 patients participated to this study (10 males and 5 females; mean ± standard deviation [SD] age: 38.1 ± 11.4 years; mean time since disease onset: 16.3 ± 7.9 years). All the participants had been provided with written information on the study's objective and protocol and had given their written, informed consent before involvement in any study-specific procedures.

This study was approved by the Independent Ethics Committee at Saint-Luc University Hospital.

Data collection

The participants underwent a clinical examination and functional assessments:

  1. A manual muscle test according to the 11-point medical research council scale[15]
  2. The motor function measure (MFM), a 32-item functional scale that was developed to assess the severity of NMD. The MFM was validated in a large population of participants affected by various NMDs[16]
  3. A timed 10-m walking test: The participants were asked to walk 10 m at a comfortable speed. The average completion time for three trials was recorded.


Three-dimensional instrumented gait analysis

Anthropometric parameters were measured and recorded. The participants were instructed to walk barefoot on a motorized treadmill mounted on four 3D strain-gauge force transducers.[17] For each patient, the highest comfortable walking speed on the treadmill was recorded.

Gait was assessed by 3D analysis.

Segmental kinematics were measured with the Elite System (BTS, Italy) at 200 Hz. Eight CCD-infrared cameras measured the 3D coordinates of 19 reflective markers positioned on specific anatomical landmarks. Euler angles and Newtonian mechanics were used to compute the angular displacements of the pelvis, hip, knee, and ankle.[18] For each participant, 10 successive walking cycles were recorded and averaged. Data were normalized against time expressed as a percentage of the gait cycle, with 0% corresponding to the initial foot contact on the analyzed side. Spatiotemporal parameters were assessed as 3D kinematics according to the method described by Mickelborough et al.[19]

Kinetics

Kinetic data (Mz: muscle moment and Mk: power) were computed by synchronization of the kinematics and 3D ground reaction forces (GRFs). The algorithm described by Davis and Cavanagh[20] enables determination of the CoP and vertical GRF under each foot. Using an inverse dynamic approach, exploitation of the GRF, kinematic, and anthropometric data enabled us to compute the net joint moments of the hip, knee, and ankle in the sagittal plane.[18] The power at each joint was calculated as the product of the angular speed and the net joint moment.

Mechanical parameters

The total positive mechanic work (Wtot) performed by the muscles during walking was divided into two components: (i) the external work (Wext) performed to move the center of body mass (COMb) relative to the surroundings and (ii) the internal work (Wint) performed to move body segments relative to the COMb. The internal and external works were computed following the method described by Willems et al.[21],[22]

Electromyography

The muscle electrical activity of the vastus lateralis (VL), semitendinosus (ST), tibilalis anterior(TA), and gastrocnemius lateralis (GL) muscles was recorded by a wireless EMG system (BTS, Italy) through surface electrodes (Medi-Trace, Graphic Controls Corporation, NY, USA). The onset and cessation of muscle activity were both visually and mathematically determined by computing the EMG threshold voltage, as described by van Boxtel et al.[23] The mean onset and cessation time for each activation sequence was calculated over 10 gait cycles, and the duration of the muscle activity was computed accordingly.

Energetics

The metabolic cost of walking was determined from the patient's breath-by-breath oxygen consumption (Vo2)[24] and carbon dioxide production measured throughout the treadmill test with an ergospirometer (Quark b2, Cosmed, Italy).

Treadmill test protocol

Energy consumption was measured throughout the treadmill test. Data acquisition started with the rest period. Thereafter, the participants walked at a self-chosen, comfortable speed. Kinematic, kinetic, mechanical, and EMG data were analyzed together during the same 40-s acquisition. Energy consumption measurement required a steady state of at least 2 min. Two acquisitions were recorded.

Selected gait variables

Several variables were extracted from the computed mean kinetic and kinematic curves:

  1. The sagittal hip range of movement (ROM) was calculated as the difference between the maximum hip extension and maximum hip flexion positions
  2. The highest knee extension angle during stance phase
  3. The ankle sagittal ROM ratio (AROMr) was calculated as the ankle dorsiflexion ROM during the swing phase divided by the ROM over the entire gait cycle
  4. The maximum extension and flexion moments and power of the hip
  5. The first (MzKnee) and second extension moments of the knee during the stance phase
  6. The maximum extension moment (MzA) and power (PwA) of the ankle before toe-off.


The duration of the EMG activity of the GL was recorded, as described above.

Type of values

The values are presented in diagrams that also show reference values from a population of eight healthy volunteers (mean age: 29 ± 16 years; weight: 65 ± 10 kg; height: 1.74 ± 0.05 m; no history of orthopedic or neurologic pathologies affecting the legs) evaluated at walking speeds from 1 to 6 km/h.[25] The previous study of Lobet et al. described the gait on the treadmill of a normal population of eight participants: as walking speed was shown to influence gait variables,[25] the values of the studied parameters were presented for the normal population with the normal mean values (±1 SD) as a regression line. The values of the patients were plotted as a function of gait speed, with the normal as described above. For the EMG, the activation time of the GL was plotted with the normative data that were published by Stoquart et al. for a population of 12 healthy volunteers.[26]

Statistical analysis

A covariance analysis including participants as a variant was performed. Statistical analyses were performed using SigmaStat software (version 2.0; Systat Software Inc., Chicago, IL, USA) and SPSS software (version 15.0; SPSS Inc., Chicago, IL, USA), with the significance level set to P = 0.05.


  Results Top


Description of the participants

Descriptive data on the study population are summarized in [Table 1]. The onset of DM1 had occurred in childhood in three cases and in adulthood in others. According to their medical history, none of our participants had lower extremity surgery. The mean spontaneous comfortable gait speed in the 10-m walking test was 3.9 ± 0.9 km/h. Depending on the patient, the gait speed during the treadmill test ranged from 1.3 to 4 km/h. The mean motor function measure (MFM) was 91.9% ± 5.8%.
Table 1: Description of the population

Click here to view


Gait parameters

Cadence was higher in all DM1 patients than in healthy controls (101.3 ± 13.9 and 81.15 ± 21.5, respectively, P < 0.0001), whereas step length was lower in all patients other than patient 5 (0.48 ± 0.14 and 0.58 ± 0.14, respectively, P = 0.023).

Kinematics

The hip ROM was lower in patients relative to healthy controls (35.1 ± 7.8 and 39.8 ± 7, respectively, P = 0.0024).

Five patients showed hyperextension of the knee during the stance phase.

The AROMr during the swing phase was dramatically lower in the patient population than in healthy controls (24 ± 23 and 63.8 ± 15.1, respectively, P < 0.0001) [Figure 1]a, [Figure 1]b, [Figure 1]c.
Figure 1: (a) Change in ankle displacement (in degree) as a function of the gait stride (in percentage). We calculated the ankle sagittal range of motion ratio: A2–A3 represents the entire ankle sagittal range of motion and A4–A3 represents the dorsiflexion range of movement during the swing phase. The ankle sagittal range of motion ratio is defined as (A4–A3)/(A2–A3).(b) The ankle sagittal range of motion ratio for each patient (black circles) as a function of treadmill speed. The black line and the gray area represent the mean (±1 standard deviation) values for healthy controls. (c) The ankle displacement of patient #5. The green and red lines represent the right and left ankle displacements, respectively. The black line and the gray area represent the mean (±1 standard deviation) values for healthy controls. Note the almost complete absence of dorsiflexion (df) during the swing phase

Click here to view


Kinetics

The positive extension moment of the hip during the initial stance phase (MzH1) was higher in patients than in healthy controls (0.38 ± 0.21 and 0.29 ± 0.17, respectively, P < 0.0001), whereas the negative flexion moment (MzH2) during swing phase was lower in patients than in healthy controls (−0.48 ± 0.7 and −0.4 ± 0.22, respectively, P = 0.03). The hip extension power (PwH1) was lower in patients than in controls (0.24 ± 0.1 and 0.27 ± 0.24, respectively, P < 0.0001), and the hip flexion power (PwH2) was lower in patients than in controls (0.3 ± 0.14 and 0.32 ± 0.27, respectively, P = 0.0021).

The negative extension power of the knee (Pknee) was higher in patients than in healthy controls (−0.82 ± 0.17 and −1.22 ± 0.71, respectively, P = 0.0043).

The plantar flexion moment of the ankle during the propulsion phase (MzA) was lower in patients than in healthy controls (0.7 ± 0.35 and 0.81 ± 0.24, respectively, P = 0.0022).

Mechanical work

The external work (Wext) in DM1 patients did not differ from healthy controls, whereas the internal work (Wint) was higher in patients (0.32 ± 0.06 and 0.19 ± 0.06, respectively, P < 0.0001). Moreover, the metabolic cost of DM1 patients did not differ from healthy controls.

Results of gait parameters, kinematic and kinetic data, and mechanical work in patients and controls are reported in [Table 2].
Table 2: Results of gait parameters, kinematic and kinetic data, and mechanical work in patients and controls

Click here to view


Electromyography

Activation of the GL was abnormally long in DM1 patients and persisted during the swing phase. [Figure 2] shows the GL activation for each participant, compared with a normal activation phase and as a function of speed. The normative data were published by Stoquart et al. for a population of 12 healthy volunteers.[26]
Figure 2: The activation phase of the gastrocnemius lateralis in patients (dark thin lines), compared with normal activation (gray area). The dashed line corresponds to the transition from stance (to the left of the dashed line) to the swing phase (to the right of the dashed line). Normal data are extracted from the study of Stoquart et al.[26]

Click here to view


The Spearman coefficient showed that the duration of muscle activation was negatively correlated with the AROMr (right leg: r = −0.58, P = 0.028; left leg: r = −0.63, P = 0.015).


  Discussion Top


The present study's primary objective was to describe gait abnormalities in a population of people with DM1. Although the DM1 prevalence is not different according to the gender, we have to notice that men were twice more included (10 men vs. 5 women) in our study.[27] Moreover, since the inclusion criteria included the ability to walk 100 m, the clinical severity of our population, with a mean MFM score of 91.9%, was not representative of the DM1 population.

Although gait in DM1 has already been characterized in the literature, this is the first study that calculated the mechanical work and energy cost of gait in patients with DM1. Despite a higher internal work in our results, we did not observe an increase in metabolic cost. This might have been due to effective proximal and axial muscle compensations.

Furthermore, no studies have reported gait analysis in DM1 on a treadmill except the short preliminary results published in 2012.[14] There are several advantages in using a treadmill for gait analysis. First, the speed is controlled, which enables comparison with a control population under the same gait conditions. Second, the duration of gait is much longer, so it is possible to record a large number of successive gait cycles. Third, since our laboratory includes a treadmill equipped with strain-gauge sensors, it enables the energy cost calculation. Gait on a treadmill can be considered as “abnormal,” since the patient has to control his/her gait in order to follow the treadmill. Balance can also be perturbed. This explains why the gait speed on the treadmill was lower than the spontaneous comfortable speed in the 10-m walking test. Nevertheless, this method has shown good reliability when measured at 1-day and 1-month intervals in adult patients after stroke.[28]

When compared with a control (healthy) population, all but one of the patients had an abnormally low step length and used an abnormally high cadence to maintain their speed on the treadmill. We suggest that the ankle plantar flexor weakness and the abnormal agonist/antagonist co-activations in the leg muscles restrict the ability to lengthen the step in DM1.

We studied the AROMr, which is related to foot drop. The ROM ratio (ROMr) was described by Ferrarin et al. in a population of children with Charcot–Marie–Tooth disease.[29] Since the overall ROM for ankle dorsiflexion can be low when the Achilles tendon shortens, the ROMr is a better guide to active dorsiflexion ability during the swing phase [Figure 1]. Our present kinematic and kinetic analyses showed an impairment of the AROMr and ankle propulsion moment in DM1, as previously described by Wright et al. and Galli et al.[10],[12] Although this could be due to weakness of the dorsal flexors, our observation of abnormally long (and sometimes permanent) EMG activity in the GL suggests that dorsal flexion is reduced by the abnormal activation of the antagonists during the swing phase. Nevertheless, we notice that passive ankle dorsiflexion of the ankle was not recorded, whereas this could although affect AROMr.

We did not observe the abnormal hip motion in the stance phase described by Wright et al.[12]

Although the knee flexion moment was not higher in our population than in the patients studied by Wright et al., we observed a decrease in the knee extension power during the stance phase. This knee extension power is due to eccentric contraction of the quadriceps during the initial stance phase and is impaired in the DM1 population by low knee flexion (and, in some cases, hyperextension) during stance.

A major kinetic abnormality observed in our study was the impairment of the ankle extension moment before toe-off. This observation is directly related to plantar flexor weakness. As shown in [Figure 2]a, ankle extension power was abnormally low in 13 of the 15 patients – even in less affected patients who scored the highest possible MFM. Although distal weakness is a very typical feature in DM1, mild clinical impairment of the GL is not easy to assess because it is one of the most powerful muscles in the body. Thus, kinetic analysis enables the assessment of ankle extension moment loss in less affected patients. This clinically almost undetectable calf weakness can also explain the gait difficulties observed in patients who appear to have normal muscle function. The use of dynamic orthotics may be indicated in the latter patients; Aiello et al. described the benefits of using an ankle-foot orthosis with anterior support, which improved power absorption and created a push-off effect in patients with DM1.[30]

Another major feature was abnormal muscle activation, as assessed by EMG and as recently observed by Galli et al.[10] In the present study, we decided to quantify muscle activation by identifying the onset and cessation of each muscle activation sequence and computing the average duration of activation for each patient and for each leg. As shown in [Figure 2], activation was abnormally long or even permanent (i.e., during the swing phase) in some cases. Moreover, we observed that the duration of muscle activity was negatively correlated with the AROMr. This is an unexpected result. Since DM1 affects both ankle dorsal flexion and plantar flexion muscle, abnormal prolonged activity of GL has not already been described. Nevertheless, DM1 is associated with delayed relaxation following contraction. Whereas myotonic muscle activity is present in most of the limb, it is classically observed in the hand and affects hand function. Nevertheless, is has although been described in lower limb muscles according to Mankodi and Grunseich.[31] Since GL was abnormally active during the swing phase in our study, we suggest that impairment of the AROMr is a consequence of abnormal calf muscle activation combined with muscle impairment of dorsal flexion muscles.

Our study did not reveal any mechanical work and metabolic cost abnormalities in DM1 patients. Despite high internal work, the metabolic cost was normal. As shown by Stoquart et al., the energy cost increase in hemiplegic patients is due to the mechanical work performed by the healthy limb in moving the COMb.[32] This is not the case in DM1, which affects the body symmetrically. We suggest that biomechanical adaptations involving the less impaired muscles are effective. A larger study with more patients comparing more affected with less affected patients could probably be more informative. This hypothesis must be assessed in mechanical analyses of other muscular dystrophies.

There are several limitations in this study. Although DM1 is one of the most frequent hereditary NMDs, it is still a rare disease; this explains why the population is small and heterogeneous. A study including adults at the onset of the disease could be more informative.

The patients' data were compared to a data set of eight healthy participants who walked at different velocities. The normal population had been described previously and is not matched to the patient population. Nevertheless, the normal population did not differ from the patients on in term of age and gender.

We conclude that kinematics and kinetics are affected in the population of patients affected by DM1, even in a patient with light functional impairment. Furthermore, we noted that the duration of GL activation was abnormal in all patients. Although it is not possible to affirm that this hyperactivation is a manifestation of myotonia, it seems to play a major role in gait abnormality in DM1.


  Conclusion Top


The major gait abnormalities in patients with DM1 are weakness and abnormal activation of the calf muscles. The gait variables are correlated with the functional impairment (e.g., the MFM). Future research on DM1 patients should investigate abnormal muscle activation, assess the potential myotonic phenomenon and study the use of dynamic orthoses.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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    Figures

  [Figure 1], [Figure 2]
 
 
    Tables

  [Table 1], [Table 2]



 

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