An inertial and magnetic sensor based technique for joint angle measurement

O’Donovan, Karol; Kamnik, Roman; O’Keeffe, Derek; Lyons, G.M.

doi:10.1016/j.jbiomech.2006.12.010

Cited by 246 publications

(174 citation statements)

References 16 publications

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“…However, to determine the KAdM, not only the GRF must be known, but also additional information is required about the position of the knee joint centre. Without using an optoelectronic marker system to indicate joint positions and orientations, the IMMS sensors on shoe and shank, which measure only orientation, need to be anatomically calibrated [10,31,44] and used in combination with a biomechanical model to estimate the joint positions. Since the results of our study show that the IFS has no negative influence on the gait pattern, the next step would be to validate the use of a combination of the IFS, several IMMS sensors and the biomechanical model to calculate the KAdM in OA patients in an ambulatory setting, compared to the results from common inverse dynamics from force plate and opto(-electronic) marker system data.…”

Section: Implicationmentioning

confidence: 99%

Influence of the instrumented force shoe on gait pattern in patients with osteoarthritis of the knee

Noort

Esch

Steultjens

et al. 2011

Med Biol Eng Comput

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Osteoarthritis (OA) of the knee is associated with alterations in gait. As an alternative to force plates, instrumented force shoes (IFSs) can be used to measure ground reaction forces. This study evaluated the influence of IFS on gait pattern in patients with knee OA. Twenty patients with knee OA walked in a gait laboratory on IFS and control shoes (CSs). An optoelectronic system and force plate were used to perform 3D gait analyses. A comparison of temporalspatial gait parameters, kinematics, and kinetics was made between IFS and CS. Patients wearing IFS showed a decrease in walking velocity and cadence (8%), unchanged stride length, an increase in stance time (13%), stride time (11%) and step width (14%). No differences were found in knee adduction moment or knee kinematics. Small differences were found in foot and ankle kinematics (2-5°), knee transverse moments (5%), ankle frontal (3%) and sagittal moments (1%) and ground reaction force (1-6%). The gait of patients with knee OA was only mildly influenced by the IFS, due to increased shoe height and weight and a change in sole stiffness. The changes were small compared to normal variation and clinically relevant differences. Importantly, in OA patients no effect was found on the knee adduction moment.

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Section: Implicationmentioning

confidence: 99%

Influence of the instrumented force shoe on gait pattern in patients with osteoarthritis of the knee

Noort

Esch

Steultjens

et al. 2011

Med Biol Eng Comput

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“…O'Donovan et al [15] report differences in accuracy depending on if the measured joint angle is mainly based on the sensor's heading information or not and therefore relying on a stable magnetometer measurement. Ren et al [17] also report that the magnetometer is vulnerable to environmental interferences.…”

Section: Discussionmentioning

confidence: 99%

“…Recent advancements in microelectromechanical systems (MEMS) made it possible to use inertial sensor-based navigation systems [14][15][16][17]. Such inertial measurement units (IMU) are small and comparably cheap and usually consist of a tri-axial gyroscope to measure rotational velocity, a tri-axial accelerometer to measure linear acceleration without gravity and a tri-axial magnetometer to sense the surrounding magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Ren et al [17] developed a prototype IMU including an extended Kalman filter for tracking hand-held surgical instruments and compared it to optical tracking. O'Donovan et al [15] used an inertial and magnetic sensor-based technique for joint angle measurements. The technique makes use of a combination of IMUs attached to the lower extremities to compute joint angles of the ankle joint.…”

Section: Introductionmentioning

confidence: 99%

“…Our work can be compared to [15] with the difference that we use the system in a clinical setting inside the OR for a demanding surgery. We also investigated our assumption of a stable magnetic field environment in the OR which often influences the performance of IMUs especially when they are used over a prolonged period as is the case for PAO surgery.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Cost-Effective Surgical Navigation Solution for Periacetabular Osteotomy (PAO) Surgery

Pflugi

Liu

Ecker

et al. 2015

Computational Radiology for Orthopaedic Interventions

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Purpose: To evaluate a low-cost, inertial sensor-based surgical navigation solution for periacetabular osteotomy (PAO) surgery without the line of sight impediment. Methods: Two commercial inertial measurement units (IMU, Xsens Technologies, TheNetherlands), are attached to a patient's pelvis and to the acetabular fragment, respectively.Registration of the patient with a pre-operatively acquired computer model is done by recording the orientation of the patient's anterior pelvic plane (APP) using one IMU. A custom-designed device is used to record the orientation of the APP in the reference coordinate system of the IMU.After registration, the two sensors are mounted to the patient's pelvis and acetabular fragment, respectively. Once the initial position is recorded, the orientation is measured and displayed on a computer screen. A patient-specific computer model generated from a pre-operatively acquired computed tomography (CT) scan is used to visualize the updated orientation of the acetabular fragment.Results: Experiments with plastic bones (8 hip joints) performed in an operating room comparing a previously developed optical navigation system with our inertial-based navigation system showed no statistically significant difference on the measurement of acetabular component reorientation. In all eight hip joints the mean absolute difference was below four degrees. Conclusion:Using two commercially available inertial measurement units we show that it is possible to accurately measure the orientation (inclination and anteversion) of the acetabular fragment during PAO surgery and therefore to successfully eliminate the line of sight impediment that optical navigation systems have.

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Sensing Technologies for Biomedical Telemetry

Nikita

2014

Handbook of Biomedical Telemetry

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An inertial and magnetic sensor based technique for joint angle measurement

Cited by 246 publications

References 16 publications

Influence of the instrumented force shoe on gait pattern in patients with osteoarthritis of the knee

Influence of the instrumented force shoe on gait pattern in patients with osteoarthritis of the knee

A Cost-Effective Surgical Navigation Solution for Periacetabular Osteotomy (PAO) Surgery

Sensing Technologies for Biomedical Telemetry

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