Implantable 9-Channel Telemetry System for In Vivo Load Measurements With Orthopedic Implants

Graichen, F.; Arnold, R.G.; Rohlmann, A.; Bergmann, G.

doi:10.1109/tbme.2006.886857

Cited by 153 publications

(81 citation statements)

References 21 publications

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“…The signals were multiplexed by a custom-made telemetry chip and transmitted by radio frequency to an external receiver. 11 The electronics were powered inductively by an external magnetic field. The instrumented implant had a mean measurement error of less than 2% and fulfilled the same safety criteria as a conventional implant.…”

Section: Instrumented Implantmentioning

confidence: 99%

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Kutzner

Heinlein²,

Graichen³

et al. 2012

J Orthop Sports Phys Ther

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Section: Instrumented Implantmentioning

confidence: 99%

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Kutzner

Heinlein²,

Graichen³

et al. 2012

J Orthop Sports Phys Ther

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“…The signals are sensed and transmitted by an inductively powered telemetry circuit. 29 The right-handed coordinate system of the implant is fixed at the right tibia. Its origin lies on the extended stem axis at the height of the lowest part of the tibial insert.…”

Section: Instrumented Implantmentioning

confidence: 99%

The effect of laterally wedged shoes on the loading of the medial knee compartment‐in vivo measurements with instrumented knee implants

Kutzner

Damm

Heinlein

et al. 2011

Journal Orthopaedic Research

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A conventional method to unload the medial compartment of patients with gonarthrosis and thus to achieve pain reduction is the use of laterally wedged shoes. Our aim was to measure in vivo their effect on medial compartment loads using instrumented knee implants. Medial tibio-femoral contact forces were measured in six subjects with instrumented knee implants during walking with the following shoes: without wedge, with 5 and 10 mm wedges under the lateral sole, and with a laterally wedged insole (5 mm). Measurements were repeated with the shoes in combination with an ankle-stabilizing orthosis. Without orthosis, peak medial forces were reduced by only 1-4% on average. With orthosis, the average reduction was 2-7%. Highest reductions were generally observed with the 10 mm wedge, followed by the 5 mm wedge, and the 5 mm insole. Individual force reductions reached up to 15%. Medial force reductions while walking with wedged shoes were generally small. Due to high inter-individual differences, it seems that some patients might benefit from lateral wedges, whereas others might not. Further analyses of the individual kinematics will show which factors are most decisive for the reduction of medial compartment load. ß

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“…The patients were videotaped during the measurements and the telemetry signals were stored on the same videotape. The telemetry and the external equipment have been described in detail elsewhere [17]. The Ethics Committee of our hospital approved the clinical implantation of telemeterized implants into the patients.…”

Section: Instrumented Vertebral Body Replacement and Patientsmentioning

confidence: 99%

In vivo measurements of the effect of whole body vibration on spinal loads

et al. 2013

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Purpose It is assumed that whole body vibration (WBV) improves muscle strength, bone density, blood flow and mobility and is therefore used in wide ranges such as to improve fitness and prevent osteoporosis and back pain. It is expected that WBV produces large forces on the spine, which poses a potential risk factor for the health of the spine. Therefore, the aim of the study was to measure the effect of various vibration frequencies, amplitudes, device types and body positions on the loads acting on a lumbar vertebral body replacement (VBR). Methods Three patients suffering from a fractured lumbar vertebral body were treated using a telemeterized VBR. The implant loads were measured during WBV while the patients stood on devices with vertically and seesawinduced vibration. Frequencies between 5 and 50 Hz and amplitudes of 1, 2 and 4 mm were tested. The patients stood with their knees straight, slightly bent, or bent at 60°. In addition, they stood on their forefeet. Results The peak resultant forces on the implant increased due to vibration by an average of 24 % relative to the forces induced without vibration. The average increase of the peak implant force was 27 % for vertically induced vibration and 15 % for seesaw vibration. The forces were higher when the legs were straight than when the knees were bent. Both the vibration frequency and the amplitude had only a minor effect on the measured forces. Conclusions The force increase due to WBV is caused by an activation of the trunk muscles and by the acceleration forces. The forces produced during WBV are usually lower than those produced during walking. Therefore, the absolute magnitude of the forces produced during WBV should not be harmful, even for people with osteoporosis.

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Implantable 9-Channel Telemetry System for In Vivo Load Measurements With Orthopedic Implants

Cited by 153 publications

References 21 publications

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

Loading of the Knee Joint During Ergometer Cycling: Telemetric In Vivo Data

The effect of laterally wedged shoes on the loading of the medial knee compartment‐in vivo measurements with instrumented knee implants

In vivo measurements of the effect of whole body vibration on spinal loads

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