Measuring Three-Dimensional Thorax Motion Via Biplane Radiographic Imaging: Technique and Preliminary Results

Baumer, Timothy G.; Giles, Joshua W.; Drake, Anne; Zauel, Roger; Bey, Michael J.

doi:10.1115/1.4032058

Cited by 4 publications

(2 citation statements)

References 31 publications

(42 reference statements)

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“… 9 , 11 Using these data, we measured conventional humerothoracic, glenohumeral, and scapulothoracic kinematics. 4 , 9 Scapulothoracic and glenohumeral ranges of motion were calculated from 20° to 105° of humerothoracic elevation. In addition, GHJ contact patterns were estimated by combining the joint motion data measured from biplane radiographic images with the subject-specific bone models.…”

Section: Methodsmentioning

confidence: 99%

Effects of Rotator Cuff Pathology and Physical Therapy on In Vivo Shoulder Motion and Clinical Outcomes in Patients With a Symptomatic Full-Thickness Rotator Cuff Tear

Baumer

Chan

Mende

et al. 2016

Orthopaedic Journal of Sports Medicine

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Background:Physical therapy (PT) is often prescribed for patients with rotator cuff tears. The extent to which PT influences strength, range of motion (ROM), and patient-reported outcomes has been studied extensively, but the effect of PT on in vivo joint kinematics is not well understood.Purpose:To assess the influence of symptomatic rotator cuff pathology and the effects of PT on shoulder motion, strength, and patient-reported outcomes.Study Design:Controlled laboratory study.Methods:Twenty-five patients with a symptomatic rotator cuff tear and 25 age-matched asymptomatic control subjects were recruited. Shoulder motion was measured using a biplane radiography imaging system, strength was assessed with a Biodex dynamometer, and patient-reported outcomes were assessed using the Western Ontario Rotator Cuff Index and visual analog scale (VAS) pain scores. Data were acquired from the patients before and after 8 weeks of physical therapy. Data were acquired at 1 time point for the control subjects.Results:Compared with the control subjects, patients with a symptomatic rotator cuff tear had significantly worse pain/function scores (P < .01); less ROM (P < .01); lower abduction (ABD), external rotation (ER), and internal rotation (IR) strength (P < .01); less scapulothoracic posterior tilt (P = .05); and lower glenohumeral joint elevation (P < .01). Physical therapy resulted in improved pain/function scores (P < .01), increased ROM (P < .02), increased scapulothoracic posterior tilt (P = .05), increased glenohumeral joint elevation (P = .01), and decreased acromiohumeral distance (AHD) (P = .02).Conclusion:Compared with age-matched controls, patients had worse pain/function scores, less ROM, and lower ABD, ER, and IR strength. Patients also had less scapulothoracic anteroposterior tilt, less glenohumeral joint elevation, and an altered glenohumeral joint contact path. PT resulted in improved pain/function scores, increased ROM, greater posterior scapulothoracic tilt, increased glenohumeral joint elevation, an increased range of superoinferior joint contact, and a lower mean AHD. Of these differences, PT only returned scapulothoracic tilt to control levels.Clinical Relevance:This study documents the effects of PT on shoulder motion and conventional clinical outcomes. It is expected that understanding how changes in joint motion are associated with conventional clinical outcomes will lead to improved nonoperative interventions for patients with rotator cuff tears.

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Section: Methodsmentioning

confidence: 99%

Effects of Rotator Cuff Pathology and Physical Therapy on In Vivo Shoulder Motion and Clinical Outcomes in Patients With a Symptomatic Full-Thickness Rotator Cuff Tear

Baumer

Chan

Mende

et al. 2016

Orthopaedic Journal of Sports Medicine

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show abstract

“…Scapulothoracic and glenohumeral ranges of motion were calculated using data from 20° to 105° of humerothoracic elevation. Due to recent advances in our biplane x-ray image acquisition protocol and analytical techniques 4 , scapulothoracic kinematics were available for only 25 of the 46 subjects (CNTL: n=9, PATH: n=16).…”

Section: Methodsmentioning

confidence: 99%

Effects of asymptomatic rotator cuff pathology on in vivo shoulder motion and clinical outcomes

Baumer

Dischler

Mende

et al. 2017

Journal of Shoulder and Elbow Surgery

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Background The incidence of asymptomatic rotator cuff tears has been reported to range from 15–39%, but the influence of asymptomatic rotator cuff pathology on shoulder function is not well understood. The objective of this study was to assess the effects of asymptomatic rotator cuff pathology on shoulder kinematics, strength, and patient-reported outcomes. Methods 46 asymptomatic volunteers (age: 60.3±7.5) with normal shoulder function underwent a clinical ultrasound exam to document the condition of their rotator cuff. The ultrasound imaging identified subjects as healthy (n=14) or pathologic (n=32). Shoulder motion was measured with a biplane x-ray imaging system, strength was assessed with a Biodex, and patient-reported outcomes were assessed using the Western Ontario Rotator Cuff Index and VAS pain scores. Results Compared to healthy subjects, the subjects with rotator cuff pathology had significantly less abduction (p=0.050) and elevation (p=0.041) strength, their humerus was positioned more inferiorly on the glenoid (p=0.018), and the glenohumeral contact path length was longer (p=0.007). No significant differences were detected in terms of WORC, VAS, ROM, or acromiohumeral distance. Discussion The differences observed between the healthy subjects and subjects with asymptomatic rotator cuff pathology lend insight into the changes in joint mechanics, shoulder strength, and conventional clinical outcomes associated with the early stages of rotator cuff pathology. Furthermore, these findings suggest a plausible mechanical progression of kinematic and strength changes associated with the development of rotator cuff pathology. Level of evidence Basic Science Study, Kinesiology

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How does computed tomography inform our understanding of shoulder kinematics? A structured review

Daher

Hunter

Athwal

et al. 2023

Med Biol Eng Comput

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Measuring Three-Dimensional Thorax Motion Via Biplane Radiographic Imaging: Technique and Preliminary Results

Cited by 4 publications

References 31 publications

Effects of Rotator Cuff Pathology and Physical Therapy on In Vivo Shoulder Motion and Clinical Outcomes in Patients With a Symptomatic Full-Thickness Rotator Cuff Tear

Effects of Rotator Cuff Pathology and Physical Therapy on In Vivo Shoulder Motion and Clinical Outcomes in Patients With a Symptomatic Full-Thickness Rotator Cuff Tear

Effects of asymptomatic rotator cuff pathology on in vivo shoulder motion and clinical outcomes

How does computed tomography inform our understanding of shoulder kinematics? A structured review

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