Wrist Area Research Articles

Robot-assisted automated sorting techniques for plastic recycling

This report discusses the current state of the art of robot-assisted sorting and separation systems in waste processing for the recovery of recyclable materials. The sorting methods addressed here are limited to the waste disposed of by households and include the sorting of pre-sorted municipal waste, e. g. plastic sorting. The focus is on the challenges of proven material recovery facilities and why manual sorting is still a necessity for efficient waste sorting. Solutions are sought to eliminate the employment of humans partially or completely for waste sorting. Suitable gripping components are to be found since one of the biggest challenges in waste sorting is gripping objects with different shapes, sizes, weights, positions, and materials. Not only existing techniques in the waste industry are addressed, but a broad spectrum is searched for possible universal grippers. This paper aims to provide a comprehensive overview of the state-of-the-art robotic systems in the waste industry and presents different types of grippers that can lead to a possible solution to the described challenge. Through an evaluation system, the presented grippers were compared, revealing that the combination of individual gripping mechanisms is promising for waste handling. Furthermore, it was found that sufficient degrees of freedom in the wrist area of a robotic arm can facilitate better gripping quality.

THE INFLUENCE OF COMPETITIVE LEVEL ON THE SPORTS SPECIFIC PERFORMANCES OF WHEELCHAIR BASKETBALL PLAYERS

The main purpose of the present study is to evaluate the physical characteristics and field test performances of wheelchair basketball (WB) players according to the competitive level (CL). The second goal was to compare the results of physical characteristics and field test performances of WB athletes with different functional classification (FC) scores. Seventy-five (70 males- 5 females) proffesional WB athletes took part in this study. The athletes were divided into two CL: Elite (Super and First League)- Sub-elite (Second and Third League) categories. Players are also grouped into two FC categories: Category A (classes from 1.0 to 2.5)- Category B (classes from 3.0 to 4.5). Players underwent anthropometric measurements, bilateral grip strenght and took field tests in separated sessions. Field tests were evaluated with 20-meter sprint, slalom without the ball, slalom with the ball, zone shot, lay up, passing accuracy, and shuttle run test. Between group differences and correlations were computed to assess the study hypotheses. Statistical differences were observed when the bilateral grip strength and field test performances of WB athletes were examined according to the CL and FC categories. The sitting height and FC score were found to be the indicators that best expressed the field test performances. It has been determined that the field performance in WB differs according to the CL. Besides; since the hand wrist area is intensively used in many movements in WB, a common measurement such as grip strength should be evaluated as a performance criterion in WB athletes.

Complex trigger wrist associated with carpal tunnel syndrome: a case report

BackgroundThere are few reports of trigger wrist in the literature, as it is a rare pathology. Furthermore, various authors report that it is also hard to diagnose. It manifests with neurological symptoms at the affected wrist, which are usually induced by wrist movement, and can lead to partial or full loss of wrist function and sensitivity. The reason for reporting this specific case is that it was hard to differentiate between trigger finger and trigger wrist by clinical symptoms; no pathology was palpable or clearly seen on magnetic resonance imaging scan of the wrist. We propose a new diagnostic statement relative to this pathology.Case presentationA case of a 45-year-old white slavic man with trigger wrist associated with carpal tunnel syndrome, caused by a fibroma of the flexor tendon sheath, is reported. Despite careful clinical examination, it was not possible to differentiate between trigger finger and trigger wrist. Magnetic resonance imaging was performed to arrive at the right diagnosis but did not reveal any pathology in the wrist area. Carpal tunnel release was performed with a fibroma identified and excised. Wrist function was maintained well; no signs of carpal tunnel syndrome were seen at last follow-up.ConclusionsTrigger wrist can be misdiagnosed as trigger finger even if adequate clinical evaluation is performed, and this can lead to inadequate treatment. We state that, when clinical symptoms of both trigger wrist and trigger finger are present, except painful palpation of the A-1 pulley region, the case should be referred to as trigger wrist.

HANDS ACTIVITY LEVEL AND UPPER EXTREMITY WORK-RELATED MUSCULOSKELETAL DISORDERS IN FEMALE CARPET WEAVERS: A MATCHED CASE-CONTROL STUDY

Introduction: Carpet weaving is one of the most common occupations in Iran. Studies have shown that the majority of workers in these industries are women and these people are exposed to high occupational risks such as musculoskeletal disorders (MSDs). This study aimed to evaluate the hands activity level and upper extremity work-related musculoskeletal disorders (UEWMSDs) symptoms in female carpet weavers (FCWs). Methods: This case-control observational study was performed on 150 FCWs of a carpet weaving workshop as a case group and 150 office staff as a control group. In order to assess the risk factors for UEWMSDs, the Hand Activity Level-Threshold Limit Value (HAL-TLV) method was used. The Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) was used to assess the prevalence of UEWMSDs symptoms in the past year. Data were analyzed using SPSS-V 24. Results: The mean final scores of the HAL_TLV for the case and control groups were 1.04 and 0.15, respectively. The results of the statistical analysis showed a statistical significant difference between the mean of HAL, NPF, and HAL_TLV variables in case and control groups ([Formula: see text] [Formula: see text] 0.001). Also, the results showed a statistical significant difference between the mean scores of the incidence of discomfort in the Shoulder, Forearm, and Wrist areas in the case and control groups ([Formula: see text] [Formula: see text] 0.001). Conclusion: The results of this study show the effect of increasing the level of hand activity on UEWMSDs symptoms. To reduce the level of hand activity and UEWMSDs symptoms in FCWs, there should be increased focus on work time, work speed, and the use of ergonomic, lightweight hand tools.

Prevalence of musculoskeletal disorders among the house wives following kitchen work

Background: Kitchen work related pain is one of the commonest problems now a day in housewives. During the kitchen work females have to work in awkward postures, prolonged working positions, repeated movements, improper working environment and manual handling of objects with different size, shape and weights. This study was aimed to find out the prevalence of musculoskeletal disorders (MSDs) in housewives following kitchen work.Methods: The study examined 85 healthy housewives aged between 20 to 45 years from Ahmedabad. Participants were selected as per selection criteria by simple random sampling. Written informed consent was taken from all the participants and participants were requested to fill up the questionnaires. The questionnaires- Cornell musculoskeletal discomfort questionnaire (CMDQ) and Cornell hand discomfort questionnaire (CHDQ) were used in this study. Participants were not involved in any other type of work.Results: The result of the study showed that there was high prevalence of musculoskeletal pain in lower back (64.61%), neck (61.18%), upper back (56.47%), hand (55.29 %), and wrist (52.38%) areas.Conclusions: The study concluded that high prevalence of musculoskeletal discomfort was found among the housewives following kitchen work with predominant affection of lower back, neck, upper back, hand and wrist areas.

Non-Contact Hand Movement Analysis for Optimal Configuration of Smart Sensors to Capture Parkinson's Disease Hand Tremor.

Parkinson’s disease affects millions worldwide with a large rise in expected burden over the coming decades. More easily accessible tools and techniques to diagnose and monitor Parkinson’s disease can improve the quality of life of patients. With the advent of new wearable technologies such as smart rings and watches, this is within reach. However, it is unclear what method for these new technologies may provide the best opportunity to capture the patient-specific severity. This study investigates which locations on the hand can be used to capture and monitor maximal movement/tremor severity. Using a Leap Motion device and custom-made software the volume, velocity, acceleration, and frequency of Parkinson’s (n = 55, all right-handed, majority right-sided onset) patients’ hand locations (25 joints inclusive of all fingers/thumb and the wrist) were captured simultaneously. Distal locations of the right hand, i.e., the ends of fingers and the wrist showed significant trends (p < 0.05) towards having the largest movement velocities and accelerations. The right hand, compared with the left hand, showed significantly greater volumes, velocities, and accelerations (p < 0.01). Supplementary analysis showed that the volumes, acceleration, and velocities had significant correlations (p < 0.001) with clinical MDS-UPDRS scores, indicating the potential suitability of using these metrics for monitoring disease progression. Maximal movements at the distal hand and wrist area indicate that these locations are best suited to capture hand tremor movements and monitor Parkinson’s disease.

Evaluation of Muscle Fatigue and Determination of Risk Factors of Musculoskeletal Disorders Among Saffron Harvesters in Gonabad in 2017

Aims Musculoskeletal disorders (MSDs) are common in farmers due to the high workload in agriculture. Because several factors, such as physical, personal, and psychological factors in saffron harvesters can influence persons’ physical conditions and expose them to the risk of MSDs, the present study aimed to investigate muscle fatigue and determine the prevalence of MSDs and related factors among Gonabad saffron harvesters. Methods &amp; Materials This cross-sectional study was performed on 84 saffron harvesters in Gonabad city, Iran. Data collection tools included a standard Nordic questionnaire to assess the prevalence of MSDs and the muscle fatigue assessment (MFA) method to assess body muscle fatigue. Finally, the data were analyzed using SPSS software, version 20. Findings The prevalence of MSDs in saffron harvesters in the shoulder, wrist, ankle, upper back, lower back, elbow, neck, thigh, and knee was 91.7, 90.5, 92.9, 8.48, 50, 88.1, 15.5, 50, and 47.6%, respectively. The results of the MFA evaluation also showed that the risk of muscle fatigue in the neck, right wrist, and right arm is very high in 98.8%, 49.4%, and 36.5% of employees, respectively. There was a significant relationship between MSDs in the past 12 months and age, sex, medical history, and working hours, and between muscle fatigue and age, smoking, and exercise (P&lt;0.05). Conclusion The highest prevalence of symptoms of MSDs was in the shoulder, wrist, and ankle areas. Due to the significant prevalence of MSDs among saffron harvesters, it is necessary to consider ergonomic interventions, soft movements at regular intervals, and raising awareness in the form of educational programs.

An Experimental Study on the Vibration Transmission Characteristics of Wrist Exposure to Hand Transmitted Vibration

This research intends to further improve the understanding of vibration damage mechanisms in the wrist area and to establish a more effective biodynamic model of the hand-arm system. Scholars have conducted some research work around the influencing factors of vibration response and commonly used vibration transmissibility to characterize the local vibration transmission characteristics of the hand-arm system. In this paper, a hand-transmitted vibration test platform was built according to ISO 10819, and a random combination of four ergonomic factors, namely wrist posture, arm posture, grip force, and thrust force, was used to test the vibration response of six subjects’ wrists; the total vibration transmissibility of the wrist was calculated according to the transmissibility formula. The effect of the four factors on the total vibration transmissibility of the wrist part was comprehensively analyzed, in which the wrist posture was proposed for the first time. The results show that (1) vibration transmissibility of the wrist is not only related to the arm posture, thrust force, and grip force but also related to the wrist posture; (2) the total vibration transmissibility and resonance frequency on the wrist has small correlation with large grip force and thrust force, and the vibration transmissibility of grip force 30 N and 60 N are basically equal in the low-frequency band (from 5–10 Hz to 5–20 Hz); (3) the wrist postures have a significant effect on the total vibration transmissibility at the wrist.

Haptic Information Improvement on Postural Sway is Information-Dependent But Not Influenced by Cognitive Task

Young adults reduce their sway in both light touch (LT) and anchor systems (AS), however, the cognitive involvement in these tasks is unknown. This study investigated postural control in young adults standing upright using either LT or AS, concomitantly with a cognitive task (counting). Nine adults (26 ± 7.4 years) stood in the upright tandem stance with eyes closed, with/without LT, AS (force <2 N), and a cognitive task. The mean sway amplitude of the trunk, right wrist, and shoulder ellipse area, as well as the mean force during LT and AS were obtained. The cognitive task did not influence the magnitude of trunk sway or the mean force in the LT and AS conditions. The trunk sway magnitude was reduced in the AS and even further in LT. Wrist and shoulder variability was larger in the AS than in the LT. Based on these results, we conclude that enhanced sensory cues provided by LT and AS reduce trunk sway with little or no attentional demands.

Spinal cord representation of motor cortex plasticity reflects corticospinal tract LTP

Although it is well known that activity-dependent motor cortex (MCX) plasticity produces long-term potentiation (LTP) of local cortical circuits, leading to enhanced muscle function, the effects on the corticospinal projection to spinal neurons has not yet been thoroughly studied. Here, we investigate a spinal locus for corticospinal tract (CST) plasticity in anesthetized rats using multichannel recording of motor-evoked, intraspinal local field potentials (LFPs) at the sixth cervical spinal cord segment. We produced LTP by intermittent theta burst electrical stimulation (iTBS) of the wrist area of MCX. Approximately 3 min of MCX iTBS potentiated the monosynaptic excitatory LFP recorded within the CST termination field in the dorsal horn and intermediate zone for at least 15 min after stimulation. Ventrolaterally, in the spinal cord gray matter, which is outside the CST termination field in rats, iTBS potentiated an oligosynaptic negative LFP that was localized to the wrist muscle motor pool. Spinal LTP remained robust, despite pharmacological blockade of iTBS-induced LTP within MCX using MK801, showing that activity-dependent spinal plasticity can be induced without concurrent MCX LTP. Pyramidal tract iTBS, which preferentially activates the CST, also produced significant spinal LTP, indicating the capacity for plasticity at the CST-spinal interneuron synapse. Our findings show CST monosynaptic LTP in spinal interneurons and demonstrate that spinal premotor circuits are capable of further modifying descending MCX control signals in an activity-dependent manner.

Clinical utility of quantitative analysis of bone scintigraphy in detecting clinically active joint and high disease activity in patients with rheumatoid arthritis

BackgroundThe purpose of this study was to investigate the efficiency of quantitative parameters of bone scintigraphy in detecting clinically active joint and high disease activity in patients with rheumatoid arthritis.MethodsWe retrospectively enrolled 65 patients with rheumatoid arthritis who underwent bone scintigraphy for diagnostic work-up. Quantitative analysis of bone scintigraphy images was conducted using an in-house software, and joint uptake ratio of 28 joints was measured for the calculation of the disease activity score of 28 joints using erythrocyte sedimentation rate (DAS28-ESR). The relationship between joint uptake ratio and clinical findings and the efficiency of joint uptake ratio in detecting clinically active joint and high disease activity were assessed.ResultsClinically active joint (tender and/or swollen joints) showed significantly higher joint uptake ratio than did other non-affected joints (p < 0.05). The sensitivity, specificity, positive predictive value, and negative predictive value (NPV) of joint uptake ratio for identifying clinically active joint were 78.7%, 52.0%, 32.9%, and 89.1%, respectively, and those of the summed joint uptake ratio for detecting high disease activity were 92.9%, 66.8%, 43.3%, and 97.1%, respectively; the joint uptake ratio showed high detection ability, especially for active joints of the elbow, wrist, and metacarpo-phalangeal joint areas. The summed joint uptake ratio of 28 joints showed a significantly strong positive correlation with DAS28-ESR (p < 0.001; correlation coefficient, 0.725).ConclusionQuantitative parameters of bone scintigraphy showed high sensitivity and NPV for detecting clinically active joint and high disease activity in patients with rheumatoid arthritis.

Occupational ergonomic assessment of hand pain symptoms among Bagh hand block print artisans of the handicraft textile industry in Madhya Pradesh, India

Objectives. Hand block printing is a highly repetitive and precision job involving tasks such as hitting the wooden hand block with the hands as a hammer, causing chronic mechanical trauma to the ulnar side of the palm. This study aimed to determine the prevalence of work-related hand symptoms, to identify ergonomic risks and musculoskeletal disorders (MSDs) and evidence of mechanical trauma among artisans working in Bagh print of Madhya Pradesh. Methods. Occupational risk involved in the artisan’s wrist area was identified using the modified Dutch musculoskeletal questionnaire (MDMQ) and modified Boston hand evaluation questionnaire. The Boston hand evaluation questionnaire helps in the measurement of the severity of the symptoms. A direct observation study was performed to identify the chronic effects of mechanical trauma (CEMT) on artisan’s hands. Results. Symptoms like pain, weakness, numbness and tingling were highly prevalent among the artisans, those with experience <3 years were more likely to report pain during working hours (p < 0.001) and those with experience >13 years were more likely to report numbness (p < 0.001) and tingling (p < 0.001). Conclusion. This study supports the evidence that the new artisans are at higher risks of reporting pain and CEMT, including fever and body pain, ultimately causing job loss.

PENATALAKSANAAN ACTIVE STRETCHING DAN HAND EXERCISE UNTUK MENCEGAH CARPAL TUNNEL SYNDROME DALAM PENGGUNAAN SMARTPHONE DI KELURAHAN KAUMAN KECAMATAN BATANG KABUPATEN BATANG

&lt;p&gt;Some people do not realize that using a &lt;em&gt;smartphone is &lt;/em&gt;addictive so that it affects the health of the body and can make someone lose track of time. Excessive use will cause several effects, including eye fatigue, neck muscle stiffness, as well as stiff and tingling hands. From the observation process of identifying physiotherapy problems, it was found that the complaints experienced by the family community were that sometimes there was pain and tingling in the wrist area due to the use of &lt;em&gt;smartphones&lt;/em&gt;, computers, and household activities after long-term activities. This observation process is carried out using the assessment method. The purpose of this activity is to provide knowledge and insight to the general public as well as improve the health status of the community, introduce physiotherapy, provide exercise programs in the form of &lt;em&gt;Active Stretching &lt;/em&gt;and &lt;em&gt;Hand Exercise &lt;/em&gt;in the prevention of &lt;em&gt;Carpal Tunnel Syndrome. &lt;/em&gt;Prior to outreach and training, the community was given a pretest and the community was given a post test after completing the activity. The results and conclusions obtained from the pre-test and post-test are that there is an increase in people's knowledge after counseling and training.&lt;/p&gt;&lt;strong&gt;Keywords&lt;/strong&gt; : Carpal Tunnel Syndrome, Active Stretching, Hand Exercise

Exoscope-based videocapillaroscopy system for in vivo skin microcirculation imaging of various body areas.

The capillary system immediately responds to many pathologies and environmental conditions. Accurate monitoring of its functioning often enables early detection of various diseases related to disorders in skin microcirculation. To expand the scope of capillaroscopy application, it is reasonable to visualize and assess blood microcirculation exactly in the areas of inflamed skin. Body vibrations, breathing, non-flat skin surface and other factors hamper the application of conventional capillaroscopes outside the nailfold area. In this paper, we propose an exoscope-based optical system for high-quality non-invasive computational imaging of capillary network in various areas of the body. Accurate image matching and tracking temporal intensity variations allow detecting the presence of blood pulsations, precise mapping of capillaries and photoplethysmogram acquisition. We have demonstrated the efficiency of the proposed approach experimentally by in vivo mapping and analysis of microvessels in wrist, forearm, upper-arm, breast and hip areas. We believe that the developed system will increase the diagnostic value of video capillaroscopy in clinical practice.

Probing an AI regression model for hand bone age determination using gradient-based saliency mapping

Understanding how a neural network makes decisions holds significant value for users. For this reason, gradient-based saliency mapping was tested on an artificial intelligence (AI) regression model for determining hand bone age from X-ray radiographs. The partial derivative (PD) of the inferred age with respect to input image intensity at each pixel served as a saliency marker to find sensitive areas contributing to the outcome. The mean of the absolute PD values was calculated for five anatomical regions of interest, and one hundred test images were evaluated with this procedure. The PD maps suggested that the AI model employed a holistic approach in determining hand bone age, with the wrist area being the most important at early ages. However, this importance decreased with increasing age. The middle section of the metacarpal bones was the least important area for bone age determination. The muscular region between the first and second metacarpal bones also exhibited high PD values but contained no bone age information, suggesting a region of vulnerability in age determination. An end-to-end gradient-based saliency map can be obtained from a black box regression AI model and provide insight into how the model makes decisions.

Functional Magnetic Resonance Imaging Correlates of Ventral Striatal Deep Brain Stimulation for Poststroke Pain

ObjectiveDeep brain stimulation (DBS) for pain has largely been implemented in an uncontrolled manner to target the somatosensory component of pain, with research leading to mixed results. We have previously shown that patients with poststroke pain syndrome who were treated with DBS targeting the ventral striatum/anterior limb of the internal capsule (VS/ALIC) demonstrated a significant improvement in measures related to the affective sphere of pain. In this study, we sought to determine how DBS targeting the VS/ALIC modifies brain activation in response to pain. Materials and MethodsFive patients with poststroke pain syndrome who were blinded to DBS status (ON/OFF) and six age- and sex-matched healthy controls underwent functional magnetic resonance imaging (fMRI) measuring blood oxygen level-dependent activation in a block design. In this design, each participant received heat stimuli to the affected or unaffected wrist area. Statistical comparisons were performed using fMRI z-maps. ResultsIn response to pain, patients in the DBS OFF state showed significant activation (p < 0.001) in the same regions as healthy controls (thalamus, insula, and operculum) and in additional regions (orbitofrontal and superior convexity cortical areas). DBS significantly reduced activation of these additional regions and introduced foci of significant inhibitory activation (p < 0.001) in the hippocampi when painful stimulation was applied to the affected side. ConclusionsThese findings suggest that DBS of the VS/ALIC modulates affective neural networks.

Гендерные, этнические и другие особенности кожной чувствительности

We considered the current problem of determining pain sensitivity of different sections of the human body to find the most painless and safe zones for different medical procedures. The study involved 3 groups of students, 8 people in each group. In the first group were Russian boys, in the second – Russian girls, in the third – African girls aged 18–22 years. We carried out studies in 8 areas of the body, which are most often used in medicine for injecting: cheek, shoulder, forearm, wrist, underarm, shin behind (under the knee), iliac and gluteal areas. These areas are most commonly used for various medical procedures. We determined objective differences of sensitivity thresholds of different body sections. As the threshold increases (decrease in sensitivity), these are: underarm, forearm, iliac region, lower leg behind, gluteal region, shoulder. There were no pronounced sexual features of pain sensitivity among boys and girls 18–20 years old. We revealed ethnic features of skin sensitivity. The overall sensitivity of African students is higher than that of Russians. Taking into account the features of tactile and pain sensitivity will reduce the negative sensations of patients during pain-provoking procedures.

Fixateur externe am Handgelenk – temporäre Fixation

a)Fixed-angle bridging of the wrist between radius diaphysis and metacarpus by percutaneous or minimally invasively inserted threaded pins and a frame (fixator) placed above the skin level (external); b)retention of fracture fragments by ligamentotaxis; c)temporary stabilization after bone loss at wrist and distal forearm. a)Initial treatment of fractures near the wrist or soft tissue injuries in multiple trauma patients; b)fractures of the distal radius and the distal ulna; c)dislocation of the carpus; d)infections of the wrist; e)instability after resection in the wrist area; f)fractures with impending or manifest compartment syndrome; g) fractures with extensive loss of soft tissues and lacking coverage of implants. a)Pathological changes at the site of pin application, as long as no alternative site is possible: infections, fractures, osteoporosis, tumors; b)fractures that are closed and not reduceable; c)exclusively intra-articular distal radius fractures; d)lack of compliance by the patient. Insertion of two threaded pins into the radial shaft proximal to the radiocarpal joint and two pins into the second metacarpal bone. Assembly of the fixator frame in advance of the definitive reduction. Subsequently, final reduction and fixation in the desired position by tightening of the screws on the fixator frame. Pin care and changes of wound dressing every 2-3days RESULTS: Reliable, low complication procedure for temporary fixation of the wrist for many indications.

Cerebral hemodynamics predicts the cortical area and coding scheme in the human brain for force generation by wrist muscles

The goal of this study is to identify the cortical area maximally active over the primary sensorimotor cortex (SM1) and characterize the cortical encoding for force production by wrist muscles in the human brain. The technique of functional near-infrared spectroscopy (fNIRS) was used to continuously monitor the changes in hemoglobin concentrations from the left hemisphere during isometric contractions of wrist flexion muscles over a broad range of load forces (0 ∼ 8 kgf) on the right hand. As previously shown in primate studies, this action produced hemodynamic activity predominantly in the wrist area localized dorsally to the finger region over SM1 and the hemodynamic response was systematically related to the level of load intensity. The coding scheme for force production in terms of hemodynamic signals was characterized defining eight trajectory parameters (four for amplitude coding and four for temporal coding) and analyzed for the area maximally activated over SM1. The trajectory parameter representing the oxygenated hemoglobin concentration change at the end of motor task (amplitude coding) and the timing of maximum change in oxygenated hemoglobin concentration (temporal coding) was most strongly correlated with the load variation in a superliner manner. All these results indicate the applicability of fNIRS to monitor and decode cortical activity that is correlated with low-level motor control such as isometric muscle contractions. This study may provide not only insights into cortical neural control of muscle force but also predictors of muscle force in clinical diagnostics and neural interfaces for the human brain.

The effect of Weeks of Selected Corrective Exercises on the Improvement of Musculoskeletal Disorders in Workers A food Production factory workers

Introduction: Musculoskeletal disorders are one of the common causes of occupational injuries and disability in developing countries, one of which is one of the 10 injuries that lead to absenteeism. The purpose of this study was to investigate the effect of 8 weeks of selected corrective exercises on the improvement of musculoskeletal disorders and work satisfaction in a food factory worker in Hamadan.&#x0D; Method: In this quasi-experimental ،descriptive-analytical study, the statistical population was 180 people. 32 subjects were assigned to the experimental (n=16) and control (n=16) groups. the Nordic questionnaire was used to identify exposure to disorders, the VAS index was used to determine the severity of pain, and the Minnesota questionnaire was used to obtain work satisfaction. Frequency prevalence and independent and independent t-test were used to determine the effect of selected exercises on pain and work satisfaction.&#x0D; Results: The study findings showed that musculoskeletal disorders in lumbar(58.25%), knee(47.57%), wrist(32.03%) and neck(31.03%) areas were the most prevalent. Are dedicated to themselves. In addition, the results of paired t-test indicated that after 8 weeks of selected corrective exercises, the level of pain in lumbar (P=0.001) and knee (P=0.001) again decreased significantly. In addition, work satisfaction increased significantly after this period (P=0.0001).&#x0D; Conclusion: the prevalence of musculoskeletal disorders in food factory workers was in the lumbar, knee, wrist and neck areas, which should be corrected and ergonomic interventions.Too that the selected corrective exercises have a positive effect on reducing the pain of musculoskeletal disorders and increasing the work satisfaction of workers.