平野 哲

BACKGROUND: Gait disorder remains a major challenge for individuals with stroke, affecting their quality of life and increasing the risk of secondary complications. Robot-assisted gait training (RAGT) has emerged as a promising approach for improving gait independence in individuals with stroke. This study aimed to evaluate the effect of RAGT in individuals with subacute hemiparetic stroke using a one-leg assisted gait robot called Welwalk WW-1000. METHODS: An assessor-blinded, multicenter randomized controlled trial was conducted in the convalescent rehabilitation wards of eight hospitals in Japan. Participants with first-ever hemiparetic stroke who could not walk at pre-intervention assessment were randomized to either the Welwalk group, which underwent RAGT with conventional physical therapy, or the control group, which underwent conventional physical therapy alone. Both groups received 80 min of physical therapy per day, 7 days per week, while the Welwalk group received 40 min of RAGT per day, 6 days per week, as part of their physical therapy. The primary outcome was gait independence, as assessed using the Functional Independence Measure Walk Score. RESULTS: A total of 91 participants were enrolled, 85 of whom completed the intervention. As a result, 91 participants, as a full analysis set, and 85, as a per-protocol set, were analyzed. The primary outcome, the cumulative incidence of gait-independent events, was not significantly different between the groups. Subgroup analysis revealed that the interaction between the intervention group and stroke type did not yield significant differences in either the full analysis or per-protocol set. However, although not statistically significant, a discernible trend toward improvement with Welwalk was observed in cases of cerebral infarction for the full analysis and per-protocol sets (HR 4.167 [95%CI 0.914-18.995], p = 0.065, HR 4.443 [95%CI 0.973-20.279], p = 0.054, respectively). CONCLUSIONS: The combination of RAGT using Welwalk and conventional physical therapy was not significantly more effective than conventional physical therapy alone in promoting gait independence in individuals with subacute hemiparetic stroke, although a trend toward earlier gait independence was observed in individuals with cerebral infarction. TRIAL REGISTRATION: This study was registered with the Japan Registry of Clinical Trials ( https://jrct.niph.go.jp ; jRCT 042180078) on March 3, 2019.

Introduction We aimed to explore the effect of gait training using Welwalk on gait patterns by comparing differences in gait patterns between robotic-assisted gait training using Welwalk and gait training using an orthosis in individuals with hemiparetic stroke. Methods This study included 23 individuals with hemiparetic stroke who underwent gait training with Welwalk combined with overground gait training using an orthosis. Three-dimensional motion analysis on a treadmill was performed under two conditions for each participant: during gait training with Welwalk and with the ankle-foot orthosis. The spatiotemporal parameters and gait patterns were compared between the two conditions. Results The affected step length was significantly longer, the step width was significantly wider, and the affected single support phase ratio was significantly higher in the Welwalk condition than in the orthosis condition. The index values of abnormal gait patterns were significantly lower while using Welwalk than in the orthosis condition. The following four indices were lower in the Welwalk condition: contralateral vaulting, insufficient knee flexion, excessive hip external rotation during the paretic swing phase, and paretic forefoot contact. Discussion Gait training using Welwalk increased the affected step length, step width, and single support phase while suppressing abnormal gait patterns as compared to gait training using the ankle-foot orthosis. This study suggests that gait training using Welwalk may promote a more efficient gait pattern reacquisition that suppresses abnormal gait patterns. Trial registration Prospectively registered in the Japan Registry of Clinical Trials (https://jrct.niph.go.jp; jRCTs042180152).

INTRODUCTION: Robot-assisted gait training has been reported to improve gait in individuals with hemiparetic stroke. Ideally, the gait training program should be customized based on individuals' gait characteristics and longitudinal changes. However, a gait robot that uses gait characteristics to provide individually tailored gait training has not been proposed. The new gait training robot, "Welwalk WW-2000," permits modification of various parameters, such as time and load of mechanical assistance for a patient's paralyzed leg. The robot is equipped with sensors and a markerless motion capture system to detect abnormal hemiparetic gait patterns during robot-assisted gait training. Thus, it can provide individually tailored gait training. This study aimed to investigate the criterion validity of the gait analysis system in the Welwalk WW-2000 in healthy adults. MATERIALS AND METHODS: Twelve healthy participants simulated nine abnormal gait patterns that were often manifested in individuals with hemiparetic stroke while wearing the robot. Each participant was instructed to perform a total of 36 gait trials, with four levels of severity for each abnormal gait pattern. Fifteen strides for each gait trial were recorded using the markerless motion capture system in the Welwalk WW-2000 and a marker-based three-dimensional (3D) motion analysis system. The abnormal gait pattern index was then calculated for each stride from both systems. The correlation of the index values between the two methods was evaluated using Spearman's rank correlation coefficients for each gait pattern in each participant. RESULTS: Using the participants' index values for each abnormal gait pattern obtained using the two motion analysis methods, the median Spearman's rank correlation coefficients ranged from 0.68 to 0.93, which corresponded to moderate to very high correlation. CONCLUSION: The gait analysis system in the Welwalk WW-2000 for real-time detection of abnormal gait patterns during robot-assisted gait training was suggested to be a valid method for assessing gait characteristics in individuals with hemiparetic stroke. CLINICAL TRIAL REGISTRATION: [https://jrct.niph.go.jp], identifier [jRCT 042190109].

OBJECTIVE: To compare the functional outcomes of patients with lower limb amputations receiving haemodialysis and those not receiving haemodialysis. DESIGN: A retrospective cohort study. PATIENTS: Patients with lower limb amputation who were admitted to a convalescent rehabilitation ward between January 2018 and December 2021. METHODS: The primary outcome was the effectiveness of the Functional Independence Measure (FIM) during hospitalisation in the ward. Secondary outcomes included the total and subtotal (motor/cognitive) FIM scores at discharge, gain in the total and subtotal (motor/cognitive) FIM scores, K-level at discharge, length of hospital stay in the ward, rehabilitation time, and discharge destination. Outcomes were compared between the non-haemodialysis and haemodialysis groups. RESULTS: A total of 28 patients (mean [standard deviation] age, 67.0 [11.9] years; men, 20) were enrolled in this study. Among them, 11 patients underwent haemodialysis. The FIM effectiveness was significantly higher in the non-haemodialysis group than in the haemodialysis group (median [interquartile range], 0.78 [0.72 - 0.81] vs 0.65 [0.28 - 0.75], p = 0.038). The amount of rehabilitation and all secondary outcomes were not significantly different between the groups (p > 0.05). CONCLUSION: Patients with lower limb amputation who were receiving haemodialysis had poorer FIM effectiveness than those not receiving haemodialysis.

Wearable robotic exoskeletons (WREs) have been developed from orthoses as assistive devices for gait reconstruction in patients with spinal cord injury. They can solve some problems encountered with orthoses, such as difficulty in independent walking and standing up and high energy consumption during walking. The Wearable Power-Assist Locomotor (WPAL), a WRE, was developed based on a knee-ankle-foot orthosis with a single medial hip joint. The WPAL has been updated seven times during the period from the beginning of its development, in 2005, to 2020. The latest version, launched as a commercialized model in 2016, is available for medical facilities. In this retrospective study, which included updated results from previous reports, all data were extracted from development research records from July 2007 to December 2020. The records were as follows: patient characteristics [the number of participants, injury level, and the American Spinal Injury Association Impairment Scale (AIS) score], the total number of WPAL trials when aggregating the cases with all the versions or only the latest version of the WPAL, and maximum walking performance (functional ambulation category [FAC], distance, and time of continuous walking). Thirty-one patients participated in the development research. The levels of spinal cord injury were cervical (C5-C8), upper thoracic (T3-T6), lower thoracic (T7-T12), and lumbar (L1) in 10, 5, 15, and 1 of the patients, respectively. The numbers of patients with AIS scores of A, B, C, and D were 20, 7, 4, and 0, respectively. The total number of WPAL trials was 1,785, of which 1,009 were used the latest version of the WPAL. Twenty of the patients achieved an FAC score of 4 after an average of 9 (median 8, range 2-22) WPAL trials. The continuous walking distance and time improved with the WPAL were compared to the orthosis. We confirmed that the WPAL improves walking independence in people with a wide range of spinal cord injuries, such as cervical spinal cord injuries. Further refinement of the WPAL will enable its long-term use at home.

PURPOSE: The purpose of this study was to elucidate the effects of the tongue-hold swallow (THS) on the pharyngeal wall by quantifying posterior pharyngeal wall (PPW) anterior bulge during the THS. In addition, the effect of tongue protrusion length on the extent of pharyngeal wall anterior bulge was analysed. METHODS: Thirteen healthy subjects (6 males and 7 females, 23-43 years) underwent 320-row area detector CT during saliva swallow (SS) and THS at two tongue protrusion lengths (THS1 protrude the tongue as much as 1/3 of premeasured maximum tongue protrusion length (MTP-L) and THS2 protrude the tongue as much as 2/3 of MTP-L). To acquire images of the pharynx at rest, single-phase volume scanning was performed three times during usual breathing with no tongue protrusion (rest), protrusion of the tongue at 1/3 of MTP-L (rTHS1) and protrusion of the tongue at 2/3 of MTP-L (rTHS2). Length from cervical spine to PPW (PPW-AP) and the volume of pharyngeal cavity was measured and was compared between rest, rTHS1 and rTHS2 and between SS, THS1 and THS2. Correlation between MTP-L and PPW-AP was calculated in three conditions, SS, THS1 and THS2. RESULTS: PPW-AP at rest, rTHS1 and rTHS2 was 2.9 ± 0.6 mm, 3.0 ± 0.5 mm and 3.0 ± 0.5 mm, respectively, showing no significant differences across swallows. PPW-AP at the maximum pharyngeal constriction was 8.1 ± 2.0 mm, 9.1 ± 2.4 mm and 8.7 ± 2.0 mm in SS, THS1 and THS2, respectively. Compared to SS, PPW-AP in THS1 was significantly larger (p = 0.04) and PPW-AP in THS2 was not significantly different (p = 0.09). Pharyngeal volume at rest, rTHS1 and rTHS2 was 16.4 ± 5.2 mm3 , 18.4 ± 4.5 mm3 and 21.3 ± 6.2 mm3 , respectively. It was significantly larger during rTHS2 compared with rest or rTHS1 (rTHS2-rest p = 0.007, rTHS2-rTHS1 p = 0.007). Pharyngeal volume was completely obliterated (zero volume) at maximum pharyngeal contraction in all except one subject. There was no correlation between MTP-L and PPW-AP in any of the three conditions (SS, THS1 and THS2). DISCUSSION: This study demonstrated that the expanded pharyngeal cavity due to the tongue protrusion was completely obliterated by the increase in anterior motion of pharyngeal wall during THS. It also became clear that the degree of tongue protrusion did not linearly correlate with the movement of PPW during THS. There was no relationship between PPW motion and the MTP-L, suggesting that the effect of tongue protrusion is better determined in each subject by analysing the motion of PPW using imaging tools.

【目的】歩行能力評価法Gait Ability Assessment for hemiplegics(GAA)の作成と妥当性,検者間信頼性を検証すること.【方法】新たな歩行能力評価であるGAAを考案した.次に,脳卒中患者を対象とし,2名の理学療法士によるGAAの検者間信頼を検討した.次に,既存の評価法であるFunctional Ambulation Categories(FAC),Functional Independence Measure(FIM)歩行,最大歩行速度,FIM運動項目合計点,Stroke Impairment Assessment Set(SIAS)の麻痺側運動機能の合計点(以下,SIAS-L/E),とGAAとの妥当性を検証した.【結果】GAAの検者間信頼性は,κ係数が0.76,weighted κ係数は0.96であった.GAAとの相関係数は,FACが0.95,FIM歩行が0.95,最大歩行速度が0.82,FIM運動項目合計点が0.89,SIAS-L/Eが0.61であり,いずれも有意な相関を認めた(p<0.01).【結論】GAAは高い検者間信頼性と歩行能力評価法としての妥当性を有しており,研究や臨床で応用できることが示唆された.(著者抄録)

OBJECTIVE: Although studies on the efficacy of the rehabilitation robot are increasing, there are few reports using the robot for gait training in the actual clinical setting. This study aimed to investigate the effectiveness of gait training using Welwalk in hemiparetic stroke patients in a real clinical setting. MATERIALS AND METHODS: This prospective study included 36 hemiparetic stroke patients who underwent gait training using Welwalk. We examined the walking ability improvement efficiency using Functional Independence Measure (FIM)-walk as the primary outcome, which was compared with that of 36 patients (matched control group) who underwent conventional rehabilitation. Other outcomes were the actual gait training period using Welwalk, raw FIM-walk score, lower extremity motor functions score in Stroke Impairment Assessment Set at discharge, and duration from stroke onset until discharge. RESULTS: The improvement efficiency of the FIM-walk was significantly higher in the Welwalk group than in the matched control group (control 0.48 ± 0.31, Welwalk 0.80 ± 0.38, p-value < 0.001). The mean gait training period using Welwalk was 5 weeks. No significant differences were found in other outcomes between the Welwalk group and the matched control group. CONCLUSION: This study demonstrated the effectiveness of gait training using Welwalk on the improvement efficiency of the FIM-walk in hemiparetic stroke patients in an actual clinical setting.

© 2020 IEEE. Welwalk WW-1000 is a gait exercise robotic assist system that allows subjects to walk on treadmill by attaching a knee-ankle-foot robot to a paralyzed limb. Abnormal gait patterns during exercise using Welwalk WW-1000 are evaluated by gait observation or marker-based motion analysis systems. However, gait observation is a subjective and ordinal measure, and marker-based motion analysis systems are challenging to implement due to the complexity of preparing equipment and attaching markers to subjects. In this study, we propose the Welwalk WW-2000 system, which incorporated a marker-less motion analysis system that detects abnormal gait patterns during exercise using the robotic system. Using this system, it is expected that a gait exercise program can be planned from easily obtainable, objective information. This system detects the features of abnormal gait patterns using the body position coordinates of the subject obtained from three-dimensional, inertial, knee angle, and load sensors. The purpose of this study was to validate the marker-less motion analysis system against marker-based motion analysis systems. One healthy male simulated the seven abnormal gait patterns which occur frequently in stroke patients, with four grades of severity. Spearman's rank correlation coefficients were calculated for the relationship between the abnormal gait pattern parameters calculated by each motion analysis system. The correlations between the two systems ranged from 0.81 to 0.95. Therefore, it was confirmed that the marker-less motion analysis system of the Welwalk WW-2000 was valid.

＜文献概要＞はじめに 脳卒中は要介護の主要な原因であり,要介護者全体では認知症に次ぐ第2位(18.4%)を占める.要介護度が重いほど脳卒中の割合は増え,要介護5では第1位(30.8%)である.少子高齢化により介護人材が不足する社会においては,患者の日常生活活動を向上させ,自立度を高める必要があり,リハビリテーション(以下,リハビリ)が果たすべき役割は大きい.脳卒中患者のリハビリにおいて,歩行再獲得は重要な目標の1つである.脳卒中発症後の歩行能力が,その後の患者の人生に大きな影響を与えるからである.回復期リハビリ病棟退院時の移動能力が歩行自立の患者は約7割が在宅復帰するのに対し,車いす自立・車いす監視・全介助の患者の在宅復帰率は約3割であったとする報告がある.また,歩行を獲得して退院することで,活動量が維持され,廃用予防につながることも考えられる.高齢者医療費が保険財政を圧迫する状況においては,リハビリの高効率化も求められている.平成30年度診療報酬改定では,回復期リハビリ病棟入院料の評価体系に実績指数が組み込まれ,短期間に日常生活活動を大きく改善させることが診療報酬において評価されることとなった.歩行リハビリにおいても,より短期間で,より高い歩行自立度を獲得する工夫が必要であり,歩行練習支援ロボットの貢献が期待されている.

Background: The effect of botulinum toxin A (BoNTA) injection on flexed-elbow deformity is usually evaluated using the Modified Ashworth Scale (MAS), but only with the muscle tone at rest. Some patients show the flexed-elbow deformity during gait despite low muscle tone at rest. Objective: This study aimed to evaluate the effect of BoNTA injection on flexed-elbow deformity during gait using a three-dimensional motion analysis system. Methods: Twenty stroke patients with spastic flexed-elbow deformity during gait received BoNTA injections into the upper limb muscles. The MAS score of the elbow flexors, passive elbow range of motion, comfortable overground gait velocity, and elbow flexion angle during treadmill gait were evaluated just before and 2, 6, and 12 weeks after the injection. Twenty-five healthy subjects were also recruited to provide a normal reference of the elbow flexion angle. Results: The MAS scores at 2, 6 and 12 weeks after the injection were significantly lower than that before the injection. Some patients showed no spasticity at rest but an obviously flexed elbow during gait. The elbow flexion angles during gait at 2 and 6 weeks after the injection were significantly lower than that before the injection. Conclusions: BoNTA injections to the upper limb muscles reduced muscle tone at rest and flexed-elbow deformity during gait. However, the elbow flexion angle during gait returned to its pre-injection level sooner than the muscle tone at rest. We strongly recommend evaluating muscle tone during motion and at rest, preferably using three-dimensional motion analysis since it can objectively detect small changes.

Objective: To compare the energy efficiency of Wearable Power-Assist Locomotor (WPAL) with conventional knee-ankle-foot orthoses (MSH-KAFO) such as Hip and Ankle Linked Orthosis (HALO) or Primewalk. Study design: Cross over case-series. Setting: Chubu Rosai Hospital, Aichi, Japan, which is affiliated with the Japan Organization of Occupational Health and Safety. Methods: Six patients were trained with MSH-KAFO (either HALO or Primewalk) and WPAL. They underwent 6-minute walk tests with each orthosis. Energy efficiency was estimated using physiological cost index (PCI) as well as heart rate (HR) and modified Borg score. Trial energy efficiency with MSH-KAFO was compared with WPAL to assess if differences in PCI became greater between MSH-KAFO and WPAL as time goes on during the 6-minute walk. Spearman correlation coefficient of time (range: 0.5–6.0 minutes) with the difference was calculated. The same statistical procedures were repeated for HR and modified Borg score. Results: Greater energy efficiency, representing a lower gait demand, was observed in trials with WPAL compared with MSH-KAFO (Spearman correlation coefficients for PCI, HR and modified Borg were 0.93, 0.90 and 0.97, respectively, all P &lt 0.0001). Conclusions: WPAL is a practical and energy efficient type of robotics that may be used by patients with paraplegia.

AimTo examine the efficacy of postural strategy training using a balance exercise assist robot (BEAR) as compared with conventional balance training for frail older adults. MethodsThe present study was designed as a cross-over trial without a washout term. A total of 27 community-dwelling frail or prefrail elderly residents (7 men, 20 women; age range 65-85 years) were selected from a volunteer sample. Two exercises were prepared for interventions: robotic exercise moving the center of gravity by the balance exercise assist robot system; and conventional balance training combining muscle-strengthening exercise, postural strategy training and applied motion exercise. Each exercise was carried out twice a week for 6 weeks. Participants were allocated randomly to either the robotic exercise first group or the conventional balance exercise first group. Main outcome measures: preferred and maximal gait speeds, tandem gait speeds, timed up-and-go test, functional reach test, functional base of support, center of pressure, and muscle strength of the lower extremities were assessed before and after completion of each exercise program. ResultsRobotic exercise achieved significant improvements for tandem gait speed (P = 0.012), functional reach test (P = 0.002), timed up-and-go test (P = 0.023) and muscle strength of the lower extremities (P = 0.001-0.030) compared with conventional exercise. ConclusionsIn frail or prefrail older adults, robotic exercise was more effective for improving dynamic balance and lower extremity muscle strength than conventional exercise. These findings suggest that postural strategy training with the balance exercise assist robot is effective to improve the gait instability and muscle weakness often seen in frail older adults. Geriatr Gerontol Int 2017; 17: 1982-1990.

[Purpose] To clarify the changes in postural strategy by evaluating leg joint motion and muscle activity before and after continuous exercise against perturbation using the Balance Exercise Assist Robot (BEAR). [Subjects and Methods] Nine healthy subjects (male 7, female 2 mean age 23 ± 1 years) performed a postural perturbation coping exercise only. In the task, the robot leaned and moved automatically. Participants were instructed to maintain their default upright position and they performed the exercise five times in a row (1 minute/trial). Changes in total movement distance, range of motion of each joint (hip, knee, ankle), and mean activity of each muscle for the first and fifth trials were compared. [Results] The total movement distance of BEAR and range of motion in the hip decreased significantly from the first trial to the last trial. No change in muscle activity was observed in the rectus femoris, biceps femoris, tibialis anterior or gastrocnemius. [Conclusion] The results for exercise against perturbation using BEAR in this study suggest that BEAR may be a promising method to improve the ankle strategy for maintaining a standing posture.

BACKGROUND: In a patient with severe hemiplegia, the risk of the knee giving way is high during the early stage of gait exercise with an ankle-foot orthosis. However, use of a knee-ankle-foot orthosis has many problems such as large amount of assistance and compensatory motions. To resolve these problems, we have engaged in the development of the Gait Exercise Assist Robot (GEAR). OBJECTIVE: To evaluate the improvement efficiency of walk with GEAR in a stroke patient. METHODS: The subject was a 70-year-old man presented with left thalamus hemorrhage and right hemiplegia. The patient underwent exercise with the GEAR 5 days a week, for 40 minutes per day. We evaluated the Functional Independence Measure score for walk (FIM-walk score) every week. The control group consisted of 15 patients aged 20-75 years with hemiplegia after primary stroke, who had equivalent walking ability with the subject at start. As the primary outcome, we defined improvement efficiency of FIM-walk, which was gain of FIM-walk divided the number of required weeks. RESULTS: Improvement efficiency of FIM-walk of the subject was 1.5, while that of control group was 0.48 +/- 3.2 (mean +/- SD). CONCLUSIONS: GEAR is potentially useful for gait exercise in hemiplegic patients.

BACKGROUND: Patients with tetraplegia can achieve independent gait with lateral-type powered exoskeletons; it is unclear whether medial-type powered exoskeletons allow for this. OBJECTIVE: To investigate gait training with a medial-type powered exoskeleton wearable power-assist locomotor (WPAL) in an individual with incomplete cervical (C5) and complete thoracic (T12) spinal cord injury (SCI). METHODS: The 60-session program was investigated retrospectively using medical records. Upon completion, gait performance was examined using three-dimensional motion analyses and surface electromyography (EMG) of the upper limbs. RESULTS: The subject achieved independent gait with WPAL and a walker in 12 sessions. He continuously extended his right elbow; his left elbow periodically flexed/extended. His pelvic inclination was larger than the trunk inclination during single-leg stance. EMG activity was increased in the left deltoid muscles during ipsilateral foot-contact. The right anterior and medial deltoid muscle EMG activity increased just after foot-off for each leg, as did the right biceps activity. Continuous activity was observed in the left triceps throughout the gait cycle; activity was unclear in the right triceps. CONCLUSIONS: These results suggest the importance of upper limb residual motor function, and may be useful in extending the range of clinical applications for robotic gait rehabilitation in patients with SCI.

<p>【はじめに，目的】</p><p></p><p>歩行練習アシスト（Gait Exercise Assist Robot；以下，GEAR）は，脳卒中片麻痺者の歩行練習支援を目的に開発されたロボットであり，立脚中の麻痺側下肢の支持性や遊脚中の膝屈曲などの様々なパラメータ変更による難易度調整が可能である。発症後早期から適切な難易度で多数歩練習を繰り返すことで，効率の良い歩行自立度の改善が期待される。</p><p></p><p>今回，GEARを用いて歩行練習をした患者（以下，GEAR群）の退院時の異常歩行の重症度を，GEARを用いずに従来通りの歩行練習をした患者（以下，従来群）と比較した。</p><p></p><p></p><p>【方法】</p><p></p><p>対象は，GEAR群は藤田保健衛生大学病院で発症後早期からGEARを用いて歩行練習した5症例とし，退院時に歩行計測を実施した。従来群は，初発脳卒中片麻痺患者の歩行データの中から，GEAR群1例に対して，GEAR群の退院時の発症後日数（以下，TAO）と麻痺の重症度（SIAS-mの下肢合計，以下SIAS-LT）が同程度の1症例を選出し，両群の異常歩行の重症度を比較した。GEAR群の内訳は，年齢：66.0±6.3歳，TAO：129.0±47.8日，SIAS-LT：7.6±1.1，トレッドミル歩行速度：1.7±1.1，GEAR練習日数：29.2±16.3日，従来群の内訳は，年齢：53.4±8.8歳，TAO：154.6±104.7日，SIAS-LT：7.6±1.1，トレッドミル歩行速度：1.5±0.6であった。</p><p></p><p>歩行計測は，対象の平地快適歩行速度でのトレッドミル歩行（手すり，短下肢装具使用）を，三次元動作分析システムKinemaTracer^Ⓡ（キッセイコムテック社製）を用いて，サンプリング周波数60Hzで20秒間記録した。得られたデータから，脳卒中片麻痺患者に特徴的な12種類の異常歩行の重症度の指標値を算出，比較した。統計学的処理は対応のあるt検定を用い，有意水準は5%とした。</p><p></p><p></p><p>【結果】</p><p></p><p>両群の年齢と歩行速度に有意差はなかった。従来群において，遊脚期の膝屈曲不全，分回し歩行，骨盤挙上の値が健常範囲を超えて異常を示し，GEAR群ではこれらの指標値が有意に小さかった（遊脚期の膝屈曲不全：GEAR群40.1±14.0，従来群68.5±18.0，分回し歩行：GEAR群7.5±4.1，従来群11.7±2.0，骨盤挙上：GEAR群4.2±1.7，従来群7.7±2.3）。</p><p></p><p></p><p>【結論】</p><p></p><p>遊脚期の膝屈曲不全は機能障害を示し，分回し歩行と骨盤挙上は麻痺側下肢を振り出すための代償動作である。発症後早期から麻痺側の膝を屈曲させて麻痺側下肢の振り出しをアシストすることにより，麻痺側下肢の振り出しにおける機能障害の改善と過剰な代償の抑制につながったと考えた。</p>

【はじめに，目的】歩行練習アシスト（Gait Exercise Assist Robot；以下，GEAR）は，藤田保健衛生大学とトヨタ自動車が脳卒中片麻痺者の歩行練習支援を目的に開発したロボットである。麻痺側立脚期の膝伸展と遊脚期の膝屈曲を適切に補助することで，初期から最小介助で多数歩のトレッドミル歩行練習を可能とする。また，荷重量や膝折れに対する音声フィードバック，患者用モニタに出力される歩行者の全身像と足下像を用いた視覚フィードバックなど多彩な機能を有する。今回，従来装具を用いた歩行練習に全介助を必要とした重度片麻痺者に対するGEARを用いた歩行練習の有用性について検討した。【方法】対象は介入開始の5週間前に右被殻出血により左片麻痺を呈した60歳代の女性1例とした。介入は通常練習2単位（月～金曜日）+3単位（土曜日）に加え，ロボットの着脱を含めたGEAR練習2単位（月～金曜日）を実施した。介入前の麻痺側下肢運動機能は，SIASにてHip-flexion：0，Knee-extension：0，Foot-Pat：0であった。感覚機能はTouch：1，Position：0であった。平地歩行の自立度は，RAPS-KAFO，Side-caneを使用し，FIM1点であった。高次脳機能は注意・遂行機能の低下，半側空間無視を呈した。指標はGEAR練習を開始した発症後5週から13週までの総歩行距離（m），歩行速度（km/h），重複歩距離（cm），歩行率（steps/min）の平均値を週毎に算出し，通常練習とGEAR練習を比較した。また，歩行自立度に関しては，発症後5週から13週のGEAR練習時の自立度とGEAR介入前の発症後4週を含めた通常練習時の自立度を先行研究にて脳卒中片麻痺者における平地歩行能力の経過を麻痺側下肢の運動機能と歩行自立度より分類した結果と比較した。【結果】5～13週の歩行距離，歩行速度，歩行率，歩行自立度は通常練習よりもGEAR練習の方が高値を示した。重複歩距離に関しては，ほぼ同等の値を示した。また，4～13週の平地歩行の自立度は，介入前の麻痺側下肢の運動機能と歩行自立度が同等な先行研究の結果（中央値）よりもGEAR練習の方が高値を示し，上位75%を上回る結果となった。【結論】GEAR練習では，精緻なアシスト調整性や多彩なフィードバック機能により，通常練習よりも常に最適な難易度かつ，最小限介助で長距離，多数歩の歩行練習が可能であるため，学習を促進に必要な練習の質と量を兼ね備えた治療を提供することが可能である。そのため，GEAR練習では本症例のような重度片麻痺者において，歩行能力の改善に対する有用性が高いと考えられた。今後は，GEAR練習における効果の有用性を片麻痺者に一般的に認められる異常歩行の重症度に関して通常練習群と比較することで検討する予定である。