Calibration of the “Flock of Birds” electromagnetic tracking device and its application in shoulder motion studies

Meskers, Carel G.M.; Fraterman, H.; Helm, F.C.T. van der; Vermeulen, H.; Rozing, P. M.

doi:10.1016/s0021-9290(99)00011-1

Cited by 153 publications

(87 citation statements)

References 8 publications

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“…A fourth receiver was attached to a stylus, which was used for the digitization of landmarks described in the subsequent section. 24,25 While the subjects stood with their arms at their side, several bony landmarks on the thorax, scapula, and humerus of the dominant limb were palpated and digitized with the stylus. The digitized landmarks appear in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Laudner

Myers

Pasquale

et al. 2006

J Orthop Sports Phys Ther

195

153

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Study Design: Case control group study. Objectives: To compare scapular position and orientation between baseball players with and without pathologic internal impingement. Background: Scapular dysfunction has been implicated as a contributor to throwing-related pathologic internal impingement of the shoulder due to its role in increasing the contact between the greater tuberosity and posterior-superior glenoid, thereby impinging the posterior rotator cuff tendon(s) and labrum. However, to date, no definitive data demonstrate this scapular dysfunction in throwing athletes. The purpose of this study was to assess, in a controlled laboratory environment, whether scapular position and orientation would be different in throwing athletes diagnosed with pathologic internal impingement than in a control group of throwing athletes. Methods and Measures: Eleven throwing athletes diagnosed with pathologic internal impingement, using both clinical examination and a magnetic resonance arthrogram, were demographically matched with a control group of 11 throwers with no history of upper extremity injury. An electromagnetic tracking device was used to measure scapular internal/external rotation, anterior/ posterior tilt, upward/downward rotation, sternoclavicular protraction/retraction, and elevation/ depression during humeral elevation within the scapular plane. Comparisons were made between groups with analysis of variance models (PϽ.05). Results:The individuals in the pathologic internal impingement group demonstrated statistically significant increased sternoclavicular elevation when elevating their humerus from 30°to 120°( P = .002) and from 60°to 120°(P = .003), compared to the control group. Furthermore, these patients also had increased posterior scapular tilt position (P = .016). No statistically significant differences were present in any other scapular variables measured. Conclusions: Based on the results of this study, throwing athletes diagnosed with pathologic internal impingement present with statistically significant increases in sternoclavicular elevation and scapular posterior tilt position during humeral elevation in the scapular plane.

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Section: Methodsmentioning

confidence: 99%

Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Laudner

Myers

Pasquale

et al. 2006

J Orthop Sports Phys Ther

195

153

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“…Arm and forearm sensors were fitted using a brace [12]. This kind of method and system has been used in prior studies regarding shoulder kinematics [11,13,17].…”

Section: Methodsmentioning

confidence: 99%

Contribution of the Reverse Endoprosthesis to Glenohumeral Kinematics

Bergmann

Leeuw

Janssen

et al. 2008

Clinical Orthopaedics &Amp; Related Research

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After placement of a reverse shoulder endoprosthesis, range of motion is usually still compromised. To what extent this occurs from limitation in motion of the reverse endoprosthesis is, however, unclear. We measured the motion pattern of 16 patients (18 shoulders) during three active and passive range of motion tasks using a six degree-of-freedom electromagnetic tracking device. Despite rotator cuff deficiencies, glenohumeral elevation contributed roughly two-thirds of the total thoracohumeral elevation, which is comparable to healthy subjects. However, patients could not actively use the full range of motion provided by the prosthesis. Although we found considerable interindividual differences in shoulder kinematics, the limitation in glenohumeral range of motion appears related to a lack of generated muscle force and not the design of the prosthesis.

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“…With a system such as the`Flock of Birds' electromagnetic tracking system (Ascension Technologies Corp., Burlington, VT, USA, Motion Monitor software version 3.5, Innovative Sports Training, Inc., Chicago, IL, USA) palpation is necessary only once to establish the orientations of anatomically relevant bony landmarks in the local coordinate systems of receivers positioned over the thorax, scapula and humerus. 61 By requiring only a single measurement to obtain accurate joint center description, the variability inherent in repeated bony landmark measurements in multiple arm positions is eliminated. By interfacing kinematic systems such as this with UE ground reaction force and EMG measurements, researchers have the necessary tools to acquire descriptive data of the UE joint forces, moments ( Figure 3) and muscular contributions to transfers commonly performed by individuals with SCI between a wheelchair and multiple destinations (chair, bed, commode, automobile).…”

Section: Transfer Research Recommendationsmentioning

confidence: 99%

Preserving transfer independence among individuals with spinal cord injury

et al. 2000

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Study design: Literature review. Objectives: Upper extremity (UE) joint degeneration, particularly at the shoulder, detrimentally in¯uences functional independence, quality of life, cardiovascular disease risk, and life expectancy of individuals following spinal cord injury (SCI). This review (1) describes UE use for transfers among individuals with SCI; (2) describes contributing factors associated with UE joint degeneration and loss of transfer independence; (3) summarizes and identi®es gaps in existing research; and (4) provides suggestions for future research. Results: Investigations of wheelchair transfer related UE joint and function preservation among individuals with SCI should consider factors including age and length of time from SCI onset, interface between subject-wheelchair, pain, shoulder joint range of motion (ROM) and muscle strength de®ciencies or imbalances, exercise capacity and tolerance for the physical strain of activities of daily living (ADL), body mass and composition, previous UE injury or disease history, and transfer techniques. Existing studies of transfers among individuals with SCI have relied on small groups of either asymptomatic or non-impaired subjects, with minimal integration of kinematic, kinetic and electromyographic data. Descriptions of UE joint ROM, forces, and moments produced during transfers are lacking. Conclusions: Biomechanical measurement and computer modeling have provided increasingly accurate tools for acquiring the data needed to guide intervention planning to prevent UE joint degeneration and preserve function among individuals with SCI. The identi®cation of stressful sub-components during transfers will enable intervening clinicians and engineers who design and modify assistive and adaptive devices to better serve individuals with SCI. Spinal Cord (2000) 38, 649 ± 657

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Calibration of the “Flock of Birds” electromagnetic tracking device and its application in shoulder motion studies

Cited by 153 publications

References 8 publications

Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Contribution of the Reverse Endoprosthesis to Glenohumeral Kinematics

Preserving transfer independence among individuals with spinal cord injury

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