Clinical Biomechanics最新文献

{"title":"Patients with Achilles tendinopathy use compensation strategies to reduce tendon load during rehabilitation exercises","authors":"Frea Deroost ,&nbsp;Davide Petrella ,&nbsp;Ine Mylle ,&nbsp;Benedicte Vanwanseele","doi":"10.1016/j.clinbiomech.2024.106403","DOIUrl":"10.1016/j.clinbiomech.2024.106403","url":null,"abstract":"<div><h3>Background</h3><div>This study aimed to determine differences in the Achilles tendon loading during rehabilitation exercises for Achilles tendinopathy and the ranking of these exercises, based on load, in patients with tendinopathy and controls.</div></div><div><h3>Methods</h3><div>Sixteen patients with Achilles Tendinopathy (5F &amp; 11 M, 44.1 ± 12.9 yr) and sixteen controls (4F &amp; 12 M, 39.4 ± 15.6 yr) performed rehabilitation exercises while 3D motion and ground reaction forces were measured. Musculoskeletal modeling was used to compute joint kinematics and estimate Achilles tendon load by summing the forces of individual triceps surae muscles. Subsequently, peak Achilles tendon loading, loading impulse, loading rate, loading indexes (a combination of the previous parameters), and joint angles at the time of peak loading were determined and compared between patients and controls.</div></div><div><h3>Findings</h3><div>Patients with tendinopathy exhibited significantly reduced peak Achilles tendon loading compared to controls during the exercises with the highest peak loading: unilateral heel drop with flexed knee (3.66 ± 0.90BW [AT] vs. 4.65 ± 1.10BW [Control], <em>p</em> = 0.003, d = 0.979) and walking (3.37 ± 0.49BW [AT] vs. 3.68 ± 0.33BW [Control], <em>p</em> = 0.044, d = 0.742). Additionally, during the heel drop exercise, patients with tendinopathy showed reduced ankle dorsiflexion and knee flexion. The ranking of exercises by peak loading or loading index was similar for both groups but varied depending on which loading parameter was used to define Achilles tendon loading.</div></div><div><h3>Interpretation</h3><div>During the highest load-imposing exercises, patients with tendinopathy employ compensatory strategies to reduce the load on their Achilles tendon. Clear instructions and feedback on the patient's performance are crucial as altered exercise execution influences Achilles tendon loading.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106403"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Upper limb kinematics in patients with neonatal brachial plexus palsy with different levels of palsy","authors":"Nathalie Maurel ,&nbsp;Amadou Diop ,&nbsp;Pauline Lallemant-Dudek ,&nbsp;Franck Fitoussi","doi":"10.1016/j.clinbiomech.2024.106394","DOIUrl":"10.1016/j.clinbiomech.2024.106394","url":null,"abstract":"<div><h3>Background</h3><div>Neonatal brachial plexus palsy remains a frequent condition and most of those patients often present active and passive joint limitation depending of the extend of the palsy. The aim of this study was to compare during the Mallet score tasks the upper limb kinematics of those patients with a reference database of non-involved arms but also to characterize kinematics changes according to the extent of the palsy.</div></div><div><h3>Methods</h3><div>Kinematic analysis was performed using an electromagnetic device. The point of achievement position and the range of motion were analyzed. The involved arm of thirty-three patients was studied. Several groups of patients were defined depending on the level of the palsy: a C5-C8 ± T1 group (fifteen patients), a C5-C6 group (five patients) and a C5-C7 group (thirteen patients). Data from non-involved arm of thirty patients were used as control.</div></div><div><h3>Findings</h3><div>Many significant differences were found between the control and palsy groups and between the latter. When comparing the C5-C8 ± T1 and proximal groups, for all except the mouth task, at point of achievement the scapula was more in protraction and glenohumeral elevation was lower. Elbow flexion range of motion was different for all except the external rotation task, with a decreased flexion for mouth, neck and spine tasks and a higher flexion for elevation task. For mouth task, the C5-C8 ± T1 group had a lower supination range of motion than the proximal group.</div></div><div><h3>Interpretation</h3><div>This study helps to better understand the effect of the palsy on the humerothoracic, scapulothoracic, glenohumeral and elbow kinematics.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106394"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Can summary measures of magnitude and structure of trunk movement variability differentiate between people with and without chronic low back pain?","authors":"Florian Abu Bakar ,&nbsp;Alexis F. Homs ,&nbsp;J. Bart Staal ,&nbsp;Ryan B. Graham ,&nbsp;Christophe Demattei ,&nbsp;Pascal Kouyoumdjian ,&nbsp;Arnaud F. Dupeyron ,&nbsp;Jaap H. van Dieën","doi":"10.1016/j.clinbiomech.2024.106416","DOIUrl":"10.1016/j.clinbiomech.2024.106416","url":null,"abstract":"<div><h3>Background</h3><div>There is inconsistent evidence suggesting that people with chronic low back pain may differ in variability of repeated trunk movements compared to people without chronic low back pain. These inconsistencies may be due to low reliability and task dependence of movement variability measures, which can be addressed using multiple movement tasks and summary measures.</div></div><div><h3>Methods</h3><div>Participants with and without chronic low back pain were recruited. Measurement sessions involved 30 repetitions of movements in the sagittal, transverse, and combined planes. Kinematics of the pelvis, thorax, and lumbar spine were estimated using inertial sensors placed on the sacrum and thorax. Magnitude of movement variability was quantified as the mean standard deviation of Euler angles for the thorax, pelvis, and lumbar spine across normalized cycles for each movement axes, resulting in 27 variables. Additionally, structure of variability was assessed using Lyapunov exponents for local dynamic stability, yielding 9 additional variables. Principal Component Analysis reduced the dimensionality of each variability measure (magnitude and structure). Stepwise logistic regression with principal component scores tested for differences between groups.</div></div><div><h3>Findings</h3><div>In the magnitude of variability analysis, four principal components were retained. The first two principal components significantly differentiated between people with low back pain and controls, accounting for 32.5 % and 14 % of the total variance, respectively. In the structure of variability analysis, no principal components were found to significantly contribute to differentiating between the two groups.</div></div><div><h3>Interpretation</h3><div>Summary measures of the magnitude, but not the structure, of trunk movement variability differentiated between people with and without chronic low back pain.</div><div>Clinical trial: NCT02059317, CPP: 2013.11.09bis Sud Méditerranée III, N° RCB: 2013-A01379-36.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106416"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142878544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differences in kinematics and kinetics during gait between total knee arthroplasty implant designs","authors":"Kohei Nishizawa ,&nbsp;Kengo Harato ,&nbsp;Satoshi Hakukawa ,&nbsp;Shu Kobayashi ,&nbsp;Yasuo Niki ,&nbsp;Takeo Nagura","doi":"10.1016/j.clinbiomech.2024.106404","DOIUrl":"10.1016/j.clinbiomech.2024.106404","url":null,"abstract":"<div><h3>Background</h3><div>Implant design is important for achieving proper knee biomechanics during gait following knee arthroplasty. Bicruciate-stabilized total knee arthroplasty attempts to replicate anterior stability and rotational facilitation. However, its detailed gait biomechanics compared with other implant designs have not been analyzed. The purpose of this study is to compare knee kinematics and kinetics between bicruciate-stabilized total knee arthroplasty, posterior-stabilized total knee arthroplasty, unicompartmental knee arthroplasty, and normal knees.</div></div><div><h3>Methods</h3><div>Ten healthy subjects, 16 who underwent posterior stabilized total knee arthroplasty, 12 who underwent bicruciate-stabilized total knee arthroplasty, and 13 who underwent unicompartmental knee arthroplasty were recruited. The mean follow-up period after arthroplasty was 11.0 months. Three-dimensional kinematics and kinetics were assessed using a motion capture system with subjects walking on a 5-m walkway. Comparisons between groups were conducted using the Kruskal–Wallis test, and <em>post hoc</em> analysis was performed for those parameters that differed significantly.</div></div><div><h3>Findings</h3><div>The bicruciate-stabilized total knee arthroplasty group showed decreased internal rotation compared to the unicompartmental knee arthroplasty group. Compared to the control group, the posterior-stabilized total knee arthroplasty group exhibited reduced knee extension and internal rotation moment.</div></div><div><h3>Interpretation</h3><div>Bicruciate-stabilized total knee arthroplasties exhibited different biomechanical characteristics compared to unicompartmental knee arthroplasties during terminal stance. Postoperative total knee arthroplasty rehabilitation should focus on relieving stiffness owing to insufficient knee flexion-extension motion observed in both bicruciate-stabilized and posterior-stabilized total knee arthroplasties compared with unicompartmental knee arthroplasty, which may be due to a lack of knee rotational motion during gait.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106404"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility of a novel back support device to improve spine stability and muscular activity during trunk flexion: A prospective cross-sectional study with healthy controls and low back pain subjects - preliminary","authors":"Emeric Bernier ,&nbsp;Adi Mithani ,&nbsp;Ahmed Aoude ,&nbsp;Mark Driscoll","doi":"10.1016/j.clinbiomech.2024.106414","DOIUrl":"10.1016/j.clinbiomech.2024.106414","url":null,"abstract":"<div><h3>Background</h3><div>Low back pain is a prevalent global condition often challenging to address due to the absence of a definitive diagnosis in over 80 % of cases. Manual lifting, common in many work environments, contributes to low back pain due to lumbar spine stresses, and existing assistive technologies like abdominal belts and exoskeletons have limitations in managing low back pain effectively. This paper presents a novel back support device designed to generate abdominal compression during flexion activities, potentially enhancing lumbar stability through increased intra-abdominal pressure.</div></div><div><h3>Methods</h3><div>The study involved 14 participants with chronic non-specific low back pain and 18 gender-matched healthy controls doing controlled movement tests with and without the support device.</div></div><div><h3>Findings</h3><div>Results suggest that the back support device increased intra-abdominal pressure in both groups during various functional tasks, more notably in active flexion and lifting tasks (up to +43 %). The device also contributed to decreasing lumbar range of motion during guided flexion (−18 to −37 %, except at the lumbosacral junction in the low back pain group), emphasizing its potential impact in limiting excessive spinal movement. Muscle activity assessments revealed decreased activation during active flexion and lifting movements while wearing the device, suggesting the possibility to assist trunk stabilization without the corresponding antagonistic muscle activation and associated compressive load on the spine.</div></div><div><h3>Interpretation</h3><div>These effects could help workers to maintain their activities in the workplace and help workers suffering from low back pain to gradually reintegrate work or physical activities, contributing to better overall management of back health.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106414"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142824757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of different custom-made foot orthotics on foot joint stiffness in individuals with structural hallux limitus: A quasi-experimental study","authors":"Magdalena Martinez-Rico ,&nbsp;Gabriel Gijon-Nogueron ,&nbsp;Ana Belen Ortega-Avila ,&nbsp;Luis Enrique Roche-Seruendo ,&nbsp;Ana Climent-Pedrosa ,&nbsp;Kevin Deschamps ,&nbsp;Enrique Sanchis-Sales","doi":"10.1016/j.clinbiomech.2024.106423","DOIUrl":"10.1016/j.clinbiomech.2024.106423","url":null,"abstract":"<div><h3>Background</h3><div>Normal dorsiflexion of the first metatarsophalangeal joint during dynamic activities is critical for effective propulsion. Therapeutic foot orthotics may address the pathomechanical loading and joint kinematics issues faced by this population. This study aims to evaluate the effect of two different types of Custom-made foot orthosis compared to shod condition on the stiffness of the rearfoot, midfoot, and 1st metatarsophalangeal joint during walking in patients with Structural Hallux Limitus.</div></div><div><h3>Methods</h3><div>This quasi-experimental study used a repeated-measures design with a single cohort. 24 participants with structural hallux limitus were sampled. Two custom-made Foot Orthotics – a cut-out and an anterior forefoot stabiliser element – were compared under three conditions using minimalist SAGURO neoprene shoes: shod, shod with cut-out custom-made foot orthosis, and shod with anterior forefoot stabiliser element foot orthosis. Kinematic data were captured using a modified Bruening model. We examined the variable stiffness (quantified in Nm/Kg/rad).</div></div><div><h3>Findings</h3><div>Significant differences were found in dynamic stiffness only between Anterior forefoot stabiliser element custom-made foot orthosis, and the patient shod during the propulsion phase at the 1st Metatarsophalangeal joint (R² = 0,07 <em>p</em> = 0.027) and a difference of 0,86 Nm/kg/rad. No significant differences were observed for dynamic stiffness in any other phase of the stance period across all conditions.</div></div><div><h3>Interpretation</h3><div>The Anterior forefoot stabiliser element, in particular, significantly increases the stiffness of the 1st Metatarsophalangeal joint compared to walking shod.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106423"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142900221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Female collegiate soccer players post anterior cruciate ligament reconstruction utilize aberrant movement strategies to achieve similar performance to uninjured players","authors":"Kayla M. Kowalczyk,&nbsp;Eric J. Shumski,&nbsp;Caroline Lisee,&nbsp;Robert C. Lynall","doi":"10.1016/j.clinbiomech.2024.106424","DOIUrl":"10.1016/j.clinbiomech.2024.106424","url":null,"abstract":"<div><h3>Background</h3><div>Female soccer athletes with a history of anterior cruciate ligament injury are more susceptible to secondary injuries and potentially worse sport performance. The purpose of this study was to determine if female soccer athletes post anterior cruciate ligament reconstruction demonstrate worse jump height and reactive strength index performance and lower involved limb hip, knee, and ankle joint power and absorption, and larger joint power and absorption asymmetries compared to matched uninjured athletes.</div></div><div><h3>Methods</h3><div>Eleven Division I female soccer athletes post anterior cruciate ligament reconstruction (18.8 ± 1.0 years, 1.72 ± 0.04 m, 66.4 ± 3.4 kg) and twenty-two matched controls (19.2 ± 1.0 years, 1.72 ± 0.05 m, 65.8 ± 5.0 kg) completed three trials of a standard bilateral jump landing. Separate 2 × 2 (group, limb) mixed-model ANOVAs, independent <em>t</em>-tests, and Mann-Whitney <em>U</em> tests (α ≤ 0.05) were used for analysis. Post-hoc t-tests with false discovery rate <em>P</em>-values were used on significant interactions.</div></div><div><h3>Findings</h3><div>We found no differences between groups in jump height, reactive strength index, ankle power and absorption asymmetry, hip power and absorption asymmetry, and knee absorption asymmetry (<em>P</em> &gt; 0.05). Athletes post anterior cruciate ligament reconstruction had decreased knee power in their involved limb compared to their uninvolved limb (<em>P</em> &lt; 0.001). Regardless of limb, athletes post anterior cruciate ligament reconstruction absorbed more at the hip compared to controls (<em>P</em> = 0.013).</div></div><div><h3>Interpretation</h3><div>Female soccer athletes post anterior cruciate ligament reconstruction utilize aberrant strategies to achieve the same level of performance as their uninjured peers. Specifically, the athletes utilized a hip dominant strategy to achieve similar performance outcomes.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106424"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142900222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical comparison of the intramedullary nail for the fixation of different proximal femoral fractures","authors":"Yen-Nien Chen PhD ,&nbsp;Chih-Wei Chang PhD ,&nbsp;Kuo-Chih Su PhD ,&nbsp;Chia-Jung Chang PhD","doi":"10.1016/j.clinbiomech.2025.106438","DOIUrl":"10.1016/j.clinbiomech.2025.106438","url":null,"abstract":"<div><h3>Background</h3><div>This study aimed to compare the mechanical responses, including the stability and implant stress, of different proximal femoral fractures stabilized with an intramedullary system by finite element simulation. Furthermore, the effect of number of the lag screws, including one and two screws, was also investigated.</div></div><div><h3>Methods</h3><div>A numerical hip model was created first, and then four different types of proximal femoral fractures—namely femoral neck, intertrochanteric, reverse intertrochanteric, and subtrochanteric fractures—were employed in this study. An intramedullary nail system was used to fix the four fracture types. Furthermore, two different number of lag screws, either one bigger or two smaller, was also compared. The peak loading of the femur in level walking was used for comparison.</div></div><div><h3>Findings</h3><div>The results showed that both the peak displacement and the gap opening distance in the reversed intertrochanteric fracture were obviously higher than in the other fractures. Additionally, the peak equivalent stress of the intramedullary nail in the reversed intertrochanteric fracture was the highest among all the fractures. The stress on the nail in cases of reversed intertrochanteric fracture was 4.6 times (ranging from 132.9 to 616.8 MPa) and 4.4 times (ranging from 126 to 556 MPa) higher than in intertrochanteric fractures with one and two lag screws, respectively.</div></div><div><h3>Interpretation</h3><div>The intramedullary nail is a mechanically effective device for the fixation of proximal femoral fractures. However, to avoid the nail breakage the postoperative rehabilitation process for reversed intertrochanteric fracture should be slower compared to the neck, intertrochanteric and subtrochanteric fractures.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106438"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel skin temperature estimation system for predicting pressure injury occurrence based on continuous body sensor data: A pilot study","authors":"Minami Shinkawa ,&nbsp;Yuko Mugita ,&nbsp;Toshiaki Takahashi ,&nbsp;Daijiro Haba ,&nbsp;Hiromi Sanada ,&nbsp;Gojiro Nakagami","doi":"10.1016/j.clinbiomech.2024.106413","DOIUrl":"10.1016/j.clinbiomech.2024.106413","url":null,"abstract":"<div><h3>Background</h3><div>Pressure injury prevention is important in older patients with immobility. This requires an accurate and efficient prediction of the development of pressure injuries. We aimed to develop a method for estimating skin temperature changes due to ischemia and inflammation using temperature sensors placed under bedsheets to provide an objective, non-invasive, and non-constrained risk assessment tool.</div></div><div><h3>Methods</h3><div>This study consisted of a thermal skin simulation study and a descriptive correlation study in healthy participants. A thermal skin simulation study was conducted using a model reproducing the body surface (underwear, diaper, or wet diaper conditions) and bed environment. In a descriptive-correlational study, the participants lay supine on a mattress with a temperature sensor attached to their sacral skin.</div></div><div><h3>Findings</h3><div>The thermal skin simulation study showed that temperature changes in the skin can be estimated under the sheets by inputting time-shifted temperature data into machine learning (R² = 0.9967 for underwear, 0.9950 for diapers, and 0.9869 for wet diapers). It was also demonstrated that the absolute skin temperature of a healthy individual (<em>N</em> = 17) could be estimated with the best accuracy by inputting time-shifted data into an extra-tree regressor (R² = 0.8145).</div></div><div><h3>Interpretation</h3><div>A combination of interface pressure and temperature sensors can be used to estimate skin temperature changes. These findings contribute to the development of a skin temperature measurement method that can capture temperature changes over time in clinical settings.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106413"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142866157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Squatting in adolescents with unilateral and bilateral hip dysplasia","authors":"Nicholas R. Anable ,&nbsp;Lauren A. Luginsland ,&nbsp;Wilshaw R. Stevens Jr ,&nbsp;Alex M. Loewen ,&nbsp;Chanhee Jo ,&nbsp;Yuhan Ma ,&nbsp;Kelly A. Jeans","doi":"10.1016/j.clinbiomech.2024.106426","DOIUrl":"10.1016/j.clinbiomech.2024.106426","url":null,"abstract":"<div><h3>Background</h3><div>Adolescent hip dysplasia is a condition that often affects hip mechanics, leading to loss of function, pain, and early onset osteoarthritis. Objective literature investigating functional activities remains sparse within this population. A traditional body weight deep squat has translation to everyday tasks, is a clinical screening tool, and is also a common pre/rehabilitation exercise. However, the biomechanical approach and potential movement compensations have not been investigated in this population.</div></div><div><h3>Methods</h3><div>Thirty patients diagnosed with dysplasia from a pediatric hip registry were included. Each patient completed 3D motion capture with minimal instructions during the squat. Wilcoxon signed-rank tests were conducted to compare differences between: affected and unaffected limbs, unilateral and bilateral patients, patients and controls. A Spearman correlation assessed the relationship between symptom severity (modified Harris Hip Score) and squat depth.</div></div><div><h3>Findings</h3><div>Unilateral and bilateral patients demonstrated similar biomechanical movement patterns across both limbs (<em>p</em> &gt; 0.05). When compared to controls, dysplasia patients squatted with less sagittal plane range of motion throughout the lower extremities, reducing achievable squat depth (<em>p</em> &lt; 0.05). Upright trunk positioning was identified as a movement compensation that led to a reduction in the hip flexor moment. Symptom severity was not associated with squat depth (<em>r</em> = −0.282, <em>p</em> = 0.058).</div></div><div><h3>Interpretation</h3><div>An upright trunk compensation (i.e. knee dominant squat) may be utilized by adolescent hip dysplasia patients. When incorporating squats for targeted hip strengthening in this population, it may be advisable for clinicians to encourage greater trunk flexion to effectively engage the hip musculature.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"122 ","pages":"Article 106426"},"PeriodicalIF":1.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142900224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}