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A better understanding of contact kinematics of the shoulder joint after total shoulder arthroplasty (TSA) may help identify causes of poor clinical outcomes following surgery [1]. In-vivo glenohumeral (GH) joint kinematics can be quantified from biplane fluoroscopic images using a 2D-3D image regis...
Cervical spine injuries are one of the most common diagnosed pathologies in traffic car accidents. Diagnosis is given according to patient’s symptoms and visual inspection. However, it is unknown if the diagnosis reflects also the functional impairment of the patient. The ROM data acquired with th...
This study examined whether an introduced forefoot sliding element would influence running biomechanics and performance. Rearfoot strikers performed 10 consecutive running trials on instrumented treadmill, wearing two running shoes with versus without forefoot sliding element. The present results re...
The absolute and normalized rate of torque development (RTD) of knee extensors were measured to investigate the interactions between angle-torque and angle-RTD relationships. Eighteen men performed maximal isometric explosive contraction (MIC) of knee extensors at the angles K, K-15°, K-30°, K+15Â...
Competitive rowing highly values boat position and velocity data for real-time feedback during training, racing and post-training analysis. The ubiquity of smartphones with embedded position (GPS) and motion (accelerometer) sensors motivates their possible use in these tasks. In this work, we presen...
Cam-type femoroacetabular impingement (FAI) is linked with participation in specific elite-level sports. We measured hip motion during adolescent elite-level sport practices with wireless magneto-inertial sensors. Athletic-elite adolescents had increased motion intensity and hip flexion during pract...
Second anterior cruciate ligament (ACL) injuries occur in about 29% of patients following return to sport. Asymmetric movement patterns are associated with second ACL injury risk during landing. A negative psychological response during recovery has been associated with decreased gait symmetry. This ...
Spotting is a dance-specific head coordination in which dancers fixate their heads to the front while turning. An experimental study in which dancers performed continuous revolutions aimed to analyze parameters of the spotting technique, balance, and dizziness. To this end, motion capture and EOG me...
This study characterized trunk motor control strategies in subjects with low back pain (LBP) using a goal-directed, unstable sitting task assessing feedforward (motor planning) and feedback control of the lumbopelvic system. Center of pressure (COP)-based outcomes suggested that feedforward strategi...
Basketball shots are taken from a variety of horizontal and vertical positions relative to the basketball hoop with and without momentum. Here, we hypothesized that the greater the velocity of the total body, the less the arms need to contribute to the vertical velocity of the ball at release. The r...
Forward somersault movements (FSMs) are very often used in gymnastics beam competitions. FSMs include four different movements (A, B, C, D) with increasingly difficulties. Twenty-one movements (9 A, 8 B, 3 C, 1 D) performed by national or international level gymnasts were recorded using high speed v...
This research describes a new method to quantify external mechanical load during professional rugby league match play. Positional differences during match play are also explored. Outside backs and hit-up forwards spend the majority of match play in low intensity activity, however, outside backs tend...
Subject-specific gait retraining is an effective method to reduce the knee adduction moment (KAM) for knee osteoarthritis but current methods of selecting the specific training target are time-consuming and the final selected new gait pattern may be too awkward to be used in daily life. This paper p...
Following active muscle lengthening there is less activation (i.e., Electromyography; EMG) required to match a given torque target as compared with a purely isometric contraction. This activation reduction (AR) is typically investigated during torque matching tasks. It is less clear whether followin...
Fall-related traumatic brain injuries (TBI) are a major health concern in older adults. However, there is little information known about the age-related differences in head impacts during a fall. The current investigation found that physically fit older adults had a greater proportion of head impact...
Principal component analysis (PCA) [1] was used as a pattern recognition tool to detect principal modes of variability in whole body movement patterns during performance of the deep squat (DS), right hurdle step (RHS) and left hurdle step (LHS). PCA successfully identified features of the DS and hur...
The purpose of the current study was to investigate the association between upper body joint motions and propulsive efficiency in pediatric manual wheelchair users. The results highlight the role of wrist motion in the optimization of the force applied to the pushrim during manual wheelchair propuls...
The Intrepid Dynamic Exoskeletal Orthosis (IDEO) has been utilized as an alternative to amputation for patients with lower extremity trauma. Two distinct versions of the device have been built; one that has laminated rods and one modular device that has a bolted on strut. This study utilizes the uni...
Anterior cruciate ligament reconstruction (ACLR) patients were grouped into four distinct clusters, based on walking vertical ground reaction force (VGRF) traces and knee injury and osteoarthritis outcome subscores (KOOS), using a novel statistical approach. Distinct representative VGRF traces resul...
Four specimen-specific finite element (FE) models of the knee were developed and validated to investigate ACL injury mechanisms in realistic knee models, providing valuable insight into the inter-subject differences that cannot be captured with generic models calibrated to average data.
Damage to the scapholunate interosseus ligament (SLIL) is one of the most disabling upper extremity injuries. Current diagnostic approaches for SLIL are invasive or lack the specificity to assess injury location. A better understanding of carpal bone kinematics following the SLIL injury may help to ...
Tripping-related falls frequently occur at minimum foot clearance (MFC) and cause forward balance loss. In contrast, backward falls often result from slips at heel contact (HC). Previous studies have examined dynamic balance in isolated anteroposterior and mediolateral directions. The present study ...
The purpose of this study was to determine if coordination variability between the trunk and pelvis during walking turns is reduced in response to fatiguing muscle exercise. The secondary purpose was to compare two statistical methods of quantifying variability; Vector Coding and the Ellipse Area Me...
Comminuted, intra-articular distal tibia/fibula fractures remain a surgical challenge. It has been suggested that plates be applied on the compression side of the fracture; hence, medial plates for varus fracture patterns. No prior biomechanical investigations have examined this in a model that incl...
This study presents a novel approach towards balance assessment during continuous perturbed walking conditions with complex external perturbation profiles. Stability measures defined in this study are based on a seven-segment model of the human body in the sagittal plane.
The ability to use reactive stabilization strategies to recover from a slip or a trip is vital for preventing falls. Physiological impairments after stroke, such as weakness and delayed sensorimotor processing may reduce the effectiveness of rapid stepping responses to restore balance following unex...
Single Leg Cycling is capable of providing a potent training stimulus to working muscle. It has applications to in sport performance, rehabilitation, and research. Researchers have reduced biomechanical diffferences between single and double leg cycling in several ways, all requiring specialized equ...
The aim of this study is to evaluate the influence of aging on the mechanical properties of the supraspinatus tendon, using Supersonic Shearwave Imaging (SSI) elastography. We evaluated 38 healthy individuals of both sexes, being 20 in the range of 20 to 35 years and 17 over 60 years old. The shear ...
Afferent inputs of cutaneous sensitivity (CS) are essential for the control of movements. Motor control is affected already in early stages of dementia, but CS had not yet been studied. We investigated CS at the foot and hand in MCI subjects compared to controls. We only found gender differences for...
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