Accurate measurements of hip joint kinematics are essential for improving our understanding the effects injury, disease, and surgical intervention on long-term health. This study assessed accuracy conventional motion capture (MoCap) measuring center (HJC) location angles during gait, squat, step-up activities while using dynamic biplane radiography (DBR) as reference standard. Twenty-four young adults performed six trials treadmill walking, body-weight squats, step-ups within a system....

Background: Military personnel in combat roles observe a high prevalence of knee osteoarthritis. Knee total joint moment (KTJM) and the adduction percentage contribution (KAM%) KTJM have been linked to It is postulated that sex, load carriage, imposed locomotion patterns such as forced marching (FM) alter mechanics knee. The purpose this study was determine effects “military-relevant” magnitudes, patterns, sex on its planar contributions recruit-aged adults during short-duration gait tasks....

Abstract Background: Ischiofemoral impingement (IFI) is an extra-articular form of posterior hip pain caused by narrowing the space between ischial tuberosity and lesser trochanter. The ischiofemoral (IFS) can vary with differences in pelvic morphology, as well dynamically change throughout range motion. Purpose: To evaluate morphologic characteristics pelvis relation to IFS during standing, gait, standing pivot (hip extension/adduction/external rotation). Methods: Twenty-four asymptomatic...

Abstract Pathomorphologies such as femoroacetabular impingement (FAI) and developmental dysplasia of the hip (DDH) impact stability, pain, osteoarthritis progression. In vivo coverage femoral head by acetabulum has been described during low-flexion activities, but dynamic in higher-flexion where morphologies may have a greater on maintaining not fully described. The goal study was to determine activities daily living an asymptomatic cohort explore relationship between morphology....

Abstract Background: Hip instability has been generally defined as extraphysiologic hip motion that causes pain with or without the symptom of joint unsteadiness. There are currently no objective measures dynamic stability can reliably classify patients according to their functional instability. Purpose: To provide a reference for stable by quantifying space in healthy controls. Methods: Twenty-four adults (13F; age 21.9±2.2 years) were enrolled this study. Synchronized biplane radiographs...

Abstract Background: Pelvic orientation impacts hip joint mechanics and the pathomechanics of non-arthritic disorders. incidence, a measurement relationship between spine acetabulum, has also been shown to influence pelvic tilt, but its impact on gait is less well understood. Similarly, sex-based differences in during remain elusive. In vivo quantification dynamic would improve our overall understanding mechanics. Questions/Purposes: (1) Is incidence related sacral slope gait? (2)...

During cyclical steady state ambulation, such as walking, variability in stride intervals can indicate the of system. In order to define locomotor system function, observed motor patterns, regulation and gait complexity must be assessed presence a perturbation. Common perturbations, especially for military populations, are load carriage an imposed locomotion pattern known forced marching (FM). We examined interactive effects magnitude on variability, during bipedal ambulation recruit-aged...

The introduction of women into U.S. military ground close combat roles requires research sex-specific effects training and operational activities. Knee osteoarthritis is prevalent among service members; its progression has been linked to occupational tasks such as load carriage. Analyzing tibiofemoral arthrokinematics during carriage important understand potentially injurious motion progression. study purpose was identify on knee walking running in recruit-aged women. Twelve healthy walked...

Ambulating while carrying a mission specific load is one of the most frequently executed occupational tasks for military, especially individuals in combat roles. Prolonged ambulation naturally dynamic and complex process, characterized by highly multi-dimensional interactions within gait mechanics lower extremity. Recent wearable sensors studies, like inertial measurement unit (IMU)-related studies have demonstrated that machine learning (MLN) algorithms fractal analysis can successfully...

The objective was to examine the interactive effects of load magnitude and locomotion pattern on lower-extremity joint angles intralimb coordination in recruit-aged women. Twelve women walked, ran, forced marched at body weight with loads +25%, +45% an instrumented treadmill infrared cameras. Joint were assessed sagittal plane. Intralimb thigh-shank shank-foot couple continuous relative phase. Mean absolute phase (entire stride) deviation (stance phase) calculated from At heel strike,...

Abstract Optimal motor control that is stable and adaptable to perturbation reflected in the temporal arrangement regulation of gait variability. Load carriage forced-marching are common military relevant perturbations have been implicated high incidence musculoskeletal injuries populations. We investigated interactive effects load magnitude locomotion pattern on variability, stride spatiotemporal complexity during recruit-aged adults. further influences sex task duration. Healthy adults...

In the military, gait cycle rhythms during loaded marching have been shown to be neither random nor regular but instead exhibit a fractal temporal composition. Through wavelet-based analysis, this study aimed identify complex behavior of stride interval dynamics men and women ruck marching. We used data on acceleration angular velocity signals in three orthogonal directions (medial-lateral [ML], vertical [VT] anteriorposterior [AP]) acquired from inertial measurement unit (IMU) sensors...

Abstract Background Hip microinstability is an increasingly recognized source of pain and dysfunction but has no agreed upon diagnostic criteria the pathophysiology remains unclear. It been suggested that associated with caused by excess translation femoral head. Recent research indicates single-plane head can be reliably measured using dynamic ultrasonography during a supine clinical examination; however, overall accuracy technique not established, range values are found in individuals...

Abstract The purpose of this study was to identify side-to-side and sex-based differences in hip kinematics during a unilateral step-up from deep flexion. Twelve (8 men, 4 women) asymptomatic young adults performed step ascent motion while synchronized biplane radiographs the were collected at 50 images per second. Femur pelvis position determined using validated volumetric model-based tracking technique that matched digitally reconstructed created subject-specific computed tomography (CT)...

Objectives: Hip muscle function is affected by surgical intervention and of particular concern when considering post-operative rehabilitation the joint 1 . However, little known about dynamic, in vivo hip muscles during activities daily living. Marker-based motion capture studies have associated dysplastic anatomy with shorter abductor moment arm lengths walking 2 , but these measurements are complicated soft tissue artifact 3 Biplane radiography a highly accurate technique for measuring...

Objectives: Femoroacetabular impingement syndrome (FAIS) is classically described as cam, pincer, or mixed morphology, leading to pathologic osseous contact between the femur and acetabulum (Beck JBJS). Many studies have analyzed shape variability and/or in isolation, rather than utilizing meaningful articulation of a loaded joint. At present, there limited evidence characterizing how morphologic variations an articulated hip joint contribute FAIS. The primary objective this study was assess...

Soldiers often perform bipedal ambulatory tasks with load carriage. During marching they are encouraged to use a walk pattern instead of running (RN) despite translating at velocity above their gait transition (GTV), known as forced (FM). Apparent joint stiffness provides an opportunity quantify the modulation lower extremity elasticity during dynamic activity in regard loading. Moreover, potentially has implications on mechanical efficiency. However, little is how magnitude and locomotion...

Military personnel are at risk of stress fracture injuries, especially those in load carriage-based military occupational specialty, such as infantry. Recently, wearable inertial measurement unit (IMU)-based accelerometry has become a useful tool for identifying markers lower extremity musculoskeletal injury soldiers field settings. PURPOSE: To compare differences between non-dominant and dominant foot using foot-worn IMU sensors during 2km best effort run with heavy (20kg) carriage....

Medial compartment cartilage thickness can provide an indication of early stage osteoarthritis (OA), so determining tibiofemoral joint space during dynamic loading tasks is important step in investigating potential long-term degeneration. Women experience higher rates knee OA than men and military personnel are at even greater risk, understanding how military-relevant load carriage will affect arthrokinematics a female population great importance order to inform training strategies prevent...