鼻烟窝皮瓣修复拇指大面积皮肤缺损的临床应用

探讨鼻烟窝皮瓣在修复拇指大面积皮肤缺损中的方法和治疗效果。从2008年1月～2013年10月间应用桡动脉在解剖鼻烟窝穿支为血管蒂的鼻烟窝皮瓣,逆行修复拇指大面积皮肤缺损26例,年龄17岁～55岁。术后平均随访时间25个月,皮瓣全部成活。皮瓣色泽及质地与健侧拇指背侧皮肤相近,拇指活动度基本正常。因此,鼻烟窝皮瓣是一种简便经济、效果理想、患者易于接受的术式,适合应用于拇指大面积皮肤缺损的治疗。     

示中环指指尖缺损的鱼际皮瓣修复

探讨应用鱼际皮瓣修复示中环指指尖缺损的方法和效果.自2010年8月～2013年3月,应用鱼际皮瓣修复示中环指指尖缺损28例,术后评价皮瓣外观及供区愈合情况.结果术后28例皮瓣全部存活,随访时间为2个月～8个月.患指指尖皮瓣质地柔软,外形饱满,颜色与周围一致,指端无压痛,供区直接缝合,未发现刀口疲痕挛缩影响拇指及虎口功能.鱼际皮瓣修复示中环指指尖缺损手术操作简单,修复后患指指尖外观满意、供区损伤小.患者顺从性好,易于为临床医生所接受.     

23例局部随意皮瓣修复头皮缺损的临床分析

分析局部随意皮瓣修复头皮缺损的临床效果。选取2011年1月~2016年1月笔者所在医院烧伤整形科完成23例头皮随意皮瓣修复手术,术后随访3个月~12个月,结果显示,本组23例患者术后皮瓣成活100%,无皮瓣坏死、切口感染等术后并发症。其中1例患者出现小面积皮瓣边缘发黑结痂,经过多次换药后二期愈合。1例患者术后出现头皮下小面积积液囊肿,经积极抽取积液进行封闭注射治疗后痊愈。术后随访中,皮瓣部分毛发生长正常,切口无瘢痕增生,且皮损无复发。局部随意皮瓣修复头皮缺损是直径在6cm以内的头皮缺损的常用方法,且具有外形美观,皮损切除和创面修复一次完成,皮损无复发的理想方法。     

以中节指动脉弓为蒂逆行指动脉岛状皮瓣修复指端缺损

观察以中节指动脉弓为蒂逆行指动脉岛状皮瓣修复指端缺损的临床效果。对24例指端缺损的患者实行以中节指动脉弓为蒂逆行指动脉岛状皮瓣修复术。结果24例患者皮瓣全部成活,术后随访3个月~6个月,手指功能恢复良好。该手术操作简便,术后功能外观好,是修复指端特别是指腹皮肤软组织缺损的首选手术方法。     

指动脉皮瓣桥式交叉转移修复难愈性创面临床研究

探讨指动脉皮瓣桥式交叉转移修复难愈性创面临床研究。2013年1月~2015年11月,笔者所在医院对皮肤软组织坏死10例患者进行相邻指指动脉皮瓣桥式交叉转移方法修复,术后25d~30d断蒂。术后进行随访,了解手指功能恢复情况。结果 10例患者皮瓣全部成活,质地柔软,外形良好,功能恢复满意。指动脉皮瓣桥式交叉转移修复难愈性创面是一种良好的修复方法。     

以中节指动脉弓为蒂逆行指动脉岛状皮瓣修复指端缺损

观察以中节指动脉弓为蒂逆行指动脉岛状皮瓣修复指端缺损的临床效果.对24例指端缺损的患者实行以中节指动脉弓为蒂逆行指动脉岛状皮瓣修复术.结果24例患者皮瓣全部成活.术后随访3个月～6个月.手指功能恢复良好.该手术操作简便,术后功能外观好,是修复指端特别是指腹皮肤软组织缺损的首选手术方法.     

带腓肠神经腓骨复合组织瓣移植修复前臂尺侧缺损

观察以带腓肠神经的腓骨复合组织瓣移植修复前臂尺侧缺损的临床效果。对15例前臂尺侧复合组织缺损的患者实行带腓肠神经的腓骨复合组织瓣移植修复术。结果15例组织瓣全部成活,前臂功能恢复良好。应用带腓肠神经的腓骨复合组织瓣移植修复前臂尺侧缺损,是一种治疗复合组织缺损的有效手术方法。     

指动脉背侧支皮瓣在手指末节皮肤缺损治疗中的临床应用

分析指背动脉背侧支与其血管网联合供血滋养皮瓣在指末端皮肤缺损的修复中的应用效果。取中节手指固有动脉的背侧支为蒂血管,逆行切取指背皮瓣31例共35指,移植修补位于远端指间关节或其远端的皮肤缺损。若同时伴有骨、关节、肌腱等的损伤,则予以同期修复。本研究中最大切取皮瓣1.5cm×3.5cm,平均随访6±0.5个月(3至9个月),皮瓣成活率100%,皮瓣两点辨别觉9±0.2mm,95%的患者具有良好的指间关节活动能力。因此,指动脉背侧支皮瓣手术操作简单,术后成功率高且患者恢复效果好。     

带腓肠神经腓骨复合组织瓣移植修复前臂尺侧缺损

观察以带腓肠神经的腓骨复合组织瓣移植修复前臂尺侧缺损的临床效果.时15例前臂尺侧复合组织缺损的患者实行带腓肠神经的腓骨复合组织瓣移植修复术.结果15例组织瓣全部成活,前臂功能恢复良好.应用带腓肠神经的腓骨复合组织瓣移植修复前臂尺侧缺损,是一种治疗复合组织缺损的有效手术方法.     

应用烧伤整形外科技术治疗大面积皮肤撕脱伤

探讨大面积皮肤撕脱伤的治疗方法。分析总结大面积皮肤撕脱伤及合并损伤17例,根据伤情综合应用清创撕脱皮肤缝合、带蒂真皮下血管网皮瓣回植、撕脱皮肤反取皮回植、组织瓣转移修复、游离皮片移植、头皮取皮术、异体／异种皮移植、创面持续负压吸引VSD等治疗方法,观察创面修复、肢体外观及功能恢复情况。结果17例患者经综合治疗后创面均愈合。功能部位均予全层皮片或皮瓣修复;19处创面有深部组织外露,予皮瓣或肌瓣修复;随访6个月～3年,所有肢体功能良好。根据皮肤软组织损伤情况而综合运用多种烧伤整形外科技术修复大面积撕脱伤可缩短疗程,并最大可能保留受伤区域的功能与外观,改善患者生活质量。     

Effects of plantar cutaneo-muscular and tendon vibration on posture and balance during quiet and perturbed stance

Modulation of lower limb somatosensory information by tendon or plantar vibration produces directionally specific, vibration-induced falling reactions that depend on the tendon or the region of the sole that is vibrated. This study characterized the effects of different patterns of plantar cutaneo-muscular vibration and bilateral Achilles tendon vibration (ATV) on the postural strategies observed during quiet and perturbed stance. Twelve healthy young participants stood barefooted, with their vision blocked, on two sets of plantar vibrators placed on two AMTI force plates embedded in a moveable support surface. Two other vibrators were positioned over the Achilles tendons. Participants were randomly exposed to different patterns of plantar cutaneo-muscular and ATV. Tilts of the support surface in the toes-up (TU) and toes-down (TD) directions were given 5-8 s after the beginning of vibration. Body kinematics in 3D and ground reaction forces were recorded. Bilateral ATV applied with or without rearfoot vibration (RFV) during quiet stance resulted in a whole-body backward leaning accompanied by an increase in trunk extension and hip and knee flexion. RFV alone produced a forward whole-body tilt with increased flexion in trunk, hip, and ankle. When stance was perturbed by TU tilts, the center of mass (CoM) and center of pressure (CoP) displacements were larger in the presence of RFV or ATV and associated with increased peak trunk flexion. TD tilts with or without ATV resulted in no significant difference in CoM and CoP displacements, while larger trunk extension and smaller distal angular displacements were observed during ATV. RFV altered the magnitude of the balance reactions, as observed by an increase in CoP displacements and variable response in trunk displacement. Significant interactions between ATV and RFV were obtained for the peak angular excursions for both directions of perturbations, where ATV either enhanced (for TU tilts) or attenuated (for TD tilts) the influence of RFV. Manipulating somatosensory information from the plantar cutaneo-muscular and muscle spindle Ia afferents thus results in altered and widespread postural responses, as shown by profound changes in body kinematics and CoM and CoP displacements. This suggests that the CNS uses plantar cutaneo-muscular and ankle spindle afferent inputs to build an appropriate reference of verticality that influences the control of equilibrium during quiet and perturbed stance.     

The influence of adaptation and inhibition on the effects of onset asynchrony on auditory grouping

Onset asynchrony is an important cue for auditory scene analysis. For example, a harmonic of a vowel that begins before the other components contributes less to the perceived phonetic quality. This effect was thought primarily to involve high-level grouping processes, because the contribution can be partly restored by accompanying the leading portion of the harmonic (precursor) with a synchronous captor tone an octave higher, and hence too remote to influence adaptation of the auditory-nerve response to that harmonic. However, recent work suggests that this restoration effect arises instead from inhibitory interactions relatively early in central auditory processing. The experiments reported here have reevaluated the role of adaptation in grouping by onset asynchrony and explored further the inhibitory account of the restoration effect. Varying the frequency of the precursor in the range ± 10% relative to the vowel harmonic (Experiment 1), or introducing a silent interval from 0 to 320 ms between the precursor and the vowel (Experiment 2), both produce effects on vowel quality consistent with those predicted from peripheral adaptation or recovery from it. However, there were some listeners for whom even the smallest gap largely eliminated the effect of the precursor. Consistent with the inhibitory account of the restoration effect, a contralateral pure tone whose frequency is close to that of the precursor is highly effective at restoring the contribution of the asynchronous harmonic (Experiment 3). When the frequencies match, lateralization cues arising from binaural fusion of the precursor and contralateral tone may also contribute to this restoration.     

Fractioned Reaction Ttme in Power-Trained and Endurance-Trained Athletes under Conditions of Fatiguing Isometric Exercise

Fractionated knee extensor and plantar flexor reaction time (RT) components were assessed in a group of eight weightlifters and eight long distance runners. Following a 4-day period of baseline stabilization for each muscle group, a 50% maximal voluntary contraction (MVC) holding-time exercise was administered. Results showed that the runners had longer premotor times (PMT) than the weightlifters in the knee extensors, but had much faster PMTs than the lifters in the plantar flexor condition. Compared to previously reported investigations using non-athletes, the data for the present sample of athletes indicated faster total reaction times (TRT) in both the knee extensors and the plantar flexors. A resistance of 15% MVC applied during the RT task resulted in a lengthening of the motor time (MT) component in both groups prior to exercise. However, while knee extensor resisted motor time was lengthened by the exercise task, no such lengthening occurred in plantar flexor resisted RT. It is concluded that power-trained and endurance-trained athletes exhibit differences in response to a fractionated RT task, under both baseline and fatiguing exercise conditions.     

Fractioned reaction time in power-trained and endurance-trained athletes under conditions of fatiguing isometric exercise

Fractionated knee extensor and plantar flexor reaction time (RT) components were assessed in a group of eight weightlifters and eight long distance runners. Following a 4-day period of baseline stabilization for each muscle group, a 50% maximal voluntary contraction (MVC) holding-time exercise was administered. Results showed that the runners had longer premotor times (PMT) than the weightlifters in the knee extensors, but had much faster PMTs than the lifters in the plantar flexor condition. Compared to previously reported investigations using non-athletes, the data for the present sample of athletes indicated faster total reaction times(TRT) in both the knee extensors and the plantar flexors. A resistance of 15% MVC applied during the RT task resulted in a lengthening of the motor time (MT) component in both groups prior to exercise. However, while knee extensor resisted motor time was lengthened by the exercise task, no such lengthening occurred in plantar flexor resisted RT. It is concluded that power-trained and endurance-trained athletes exhibit difference in response to a fractionated RT task, under both baseline and fatiguing exercise conditions.     

Larger plantar flexion torque variability implies less stable balance in the young: An association affected by knee position

The present study examined the association between plantar flexion torque variability during isolated isometric contractions and during quiet bipedal standing. For plantar flexion torque measurements in quiet stance (QS), subjects stood still over a force plate. The mean plantar flexion torque level exerted by each subject in QS (divided by 2 to give the torque due to a single leg) served as the target torque level for right leg force-matching tasks in extended knee (KE) and flexed knee (KF) conditions. Muscle activation levels (EMG amplitudes) of the triceps surae and mean, standard deviation and coefficient of variation of plantar flexion torque were computed from signals acquired during periods with and without visual feedback. No significant correlations were found between EMG amplitudes and torque variability, regardless of the condition and muscle being analyzed. A significant correlation was found between torque variability in QS and KE, whereas no significant correlation was found between torque variability in QS and KF, regardless of vision availability. Therefore, torque variability measured in a controlled extended knee plantar flexion contraction is a predictor of torque variability in the anterior-posterior direction when the subjects are in quiet standing. In other words, larger plantar flexion torque variability in KE (but not in KF) implies less stable balance. The mechanisms underlying the findings above are probably associated with the similar proprioceptive feedback from the triceps surae in QS and KE and poorer proprioceptive feedback from the triceps surae in KF due to the slackening of the gastrocnemii. An additional putative mechanism includes the different torque contributions of each component of the triceps surae in the two knee angles. From a clinical and research standpoint, it would be advantageous to be able to estimate changes in balance ability by means of simple measurements of torque variability in a force matching task.     

Diminished plantar cutaneous sensation and postural control

The purpose of this study was to assess the effect of diminished plantar cutaneous sensation induced by cooling on postural control during double- and single-limb quiet standing. 32 healthy adults were tested on an intervention day and control day. The intervention consisted of 10 min. of ice immersion of the plantar aspect of the feet prior to balance testing. Dependent variables were center of pressure velocity and area during double- and single-limb stance with eyes open and closed. Significant interactions were found between sensation and vision for double-limb center of pressure area, with a significant reduction in area of center of pressure excursions after reducing sensation with eyes closed but not with eyes open. The area of center of pressure excursions may have been reduced in an effort to curtail exploratory postural behavior given the altered afferent input from plantar receptors. There were no significant differences for plantar hypoesthesia in single-limb stance.     

Relationship between the architecture and function of ankle plantar flexors with Achilles tendon morphology in ballet dancers

Achilles tendinopathy is the most frequent foot overuse injury in ballet dancers and knowledge of clinically modifiable factors related to tendon structure in a population at risk, such as ballet dancers, would be important for the development of preventive programs. Therefore, the present study aimed to assess relationships of gastrocnemius muscle architecture and ankle plantar flexors function with Achilles tendon morphology in ballet dancers. Fifty-four measures from 27 ballet dancers were collected. Tendon morphology (thickness, echogenicity, hypoechoic areas and neovascularisation) and muscle architecture (thickness, pennation angle and fascicle length) were evaluated using ultrasonography; ankle plantar flexors torque was evaluated using hand-held dynamometry, flexibility was evaluated in maximal weight-bearing ankle dorsiflexion position using inclinometer, and endurance was evaluated using the heel rise test. Ankle plantar flexors torque and medial gastrocnemius muscle architecture (thickness, pennation angle and fascicle length) are associated with Achilles tendon thickness in ballet dancers (r² = 0.24, p = 0.008). Ankle plantar flexors torque and medial gastrocnemius muscle fascicle length are also associated with the echogenicity of the Achilles tendon (r² = 0.13, p = 0.03). These findings call attention to the potential importance of ankle plantar flexors muscle force in healthy ballet dancers for the prevention of alterations in Achilles tendon structure.     

Gastrocnemius and soleus are selectively activated when adding knee extensor activity to plantar flexion

The gastrocnemius is a biarticular muscle that acts not only as a plantar flexor, but also as a knee flexor, meaning that it is an antagonist during knee extension. In contrast, the soleus is a monoarticular plantar flexor. Based on this anatomical difference, these muscles’ activities should be selectively activated during simultaneous plantar flexion and knee extension, which occur during many activities of daily living. This study examined the selective activation of gastrocnemius and soleus activities when voluntary isometric activation of knee extensors was added to voluntary isometric plantar flexion. Ten male volunteers performed isometric plantar flexion at 10%, 20%, and 30% of maximum effort. During each plantar flexion task, isometric knee extension was added at 0%, 50%, and 100% of maximum effort. When knee extension was added, the average rectified value of the electromyographic activity of the medial gastrocnemius was significantly depressed (P = .002), whereas that of the soleus was significantly increased (P < .001) regardless of the plantar flexion level. These results suggest that plantar flexion with concurrent knee extensor activity leads to selective activation of the soleus and depression of the synergistic activity of the gastrocnemius.     

Binocular rivalry and reciprocal inhibition

Any explanation of binocular rivalry based on a reciprocal inhibition mechanism would require that unilateral increases in the stimulus strength of the rivalry target in one eye produce increases in the mean nonsuppression duration of that eye and concommitant decreases in the mean nonsuppression duration of the contralateral eye. To test that hypothesis, the stimulus strength (in this case, contrast) of one rivalry target was varied (0.1, 1, 10, and 100 ft-L) while the strength of the target in the other eye remained constant. The data, obtained from six experienced Ss, indicate that variations in stimulus strength do not alter the mean nonsuppression duration of the recipient eye. This outcome offers a fundamental difficulty for the reciprocal inhibition concept. A model that assumes partially independent suppression and dominance mechanisms is suggested as a more adequate alternative.     

Foot Motion Character During Forward and Backward Walking With Shoes and Barefoot

Abstract

Backward walking (BW) has been extensively used in athletic training and orthopedic rehabilitation as it may have value for enhancing balance. This study identified the differences in foot intersegment kinematics (forward walking (FW) vs. time-reversed BW) and plantar pressure parameters of 16 healthy habitually shod individuals walking FW and BW using flexible shoes (SH) and under barefoot conditions (BF). BW was found to have shorter stride length (SL) and higher stride frequency (SF) under BF conditions compared with SH, which indicates a better BW gait stability under BF conditions. Decreased HX/FF dorsiflexion at HO in BW induces less plantar aponeurosis tension which may inhibit the windlass mechanism compared to FW walking. Increased forefoot relative to hindfoot (FF/HF) pronation and sequentially hindfoot relative to tibia (HF/TB) eversion combined with medially distributed plantar pressure and a higher plantar contact area in the medial side in BW–BF maybe beneficial in maintaining balance. These results indicate that BW training may be more reliable under BF conditions compared to the SH conditions based on greater sensory information feedback from the plantar area resulting in better biomechanical behavior.