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

Kutzner, Ines; Heinlein, Bernd; Graichen, F.; Rohlmann, A.; Halder, Andreas M.; Beier, Alexander; Bergmann, G.

doi:10.2519/jospt.2012.4001

Cited by 58 publications

(34 citation statements)

References 26 publications

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“…Only the cadence of 40 rpm was studied to avoid overstressing the patients, who were involved in many other load measurement studies [7]–[12]. Measurements of telemeterized knee joints showed that higher cadences lead to smaller forces in the knee joint [16]. We expected the same trend for spinal loads.…”

Section: Discussionmentioning

confidence: 87%

Spinal Loads during Cycling on an Ergometer

et al. 2014

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Cycling on an ergometer is an effective exercise for improving fitness. However, people with back problems or previous spinal surgery are often not aware of whether cycling could be harmful for them. To date, little information exists about spinal loads during cycling. A telemeterized vertebral body replacement allows in vivo measurement of implant loads during the activities of daily living. Five patients with a severe compression fracture of a lumbar vertebral body received these implants. During one measurement session, four of the participants exercised on a bicycle ergometer at various power levels. As the power level increased, the maximum resultant force and the difference between the maximum and minimum force (force range) during each pedal revolution increased. The average maximum-force increases between the two power levels 25 and 85 W were 73, 84, 225 and 75 N for the four patients. The corresponding increases in the force range during a pedal revolution were 84, 98, 166 and 101 N. There were large variations in the measured forces between the patients and also within the same patient, especially for high power levels. In two patients, the maximum forces during high-power cycling were higher than the forces during walking measured on the same day. Therefore, the authors conclude that patients with back problems should not cycle at high power levels shortly after surgery as a precaution.

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Section: Discussionmentioning

confidence: 87%

Spinal Loads during Cycling on an Ergometer

et al. 2014

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“…Participants participated in three training sessions per week lasting exactly 30 min each-according to previous studies [10]. Sessions consisted of dynamic aerobic endurance training on bicycle ergometers (ergo_bike premium8, daum electronic GmbH, Fürth, Germany) for being joint friendly and feasible within the patient population and because of the possibility for good standardization [25][26][27]. Heart rate was measured continuously (Accurex Plus and T31, Polar Electro Oy, Kempele, Finland).…”

Section: Interventionsmentioning

confidence: 99%

Endurance training in patients with schizophrenia and healthy controls: differences and similarities

Keller-Varady

Hasan

Schneider‐Axmann

et al. 2015

Eur Arch Psychiatry Clin Neurosci

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The aims were to examine the feasibility of and adaptations to endurance training in persons diagnosed with schizophrenia and to address the question whether the principles and beneficial effects of endurance training established in the healthy population apply also to patients with schizophrenia. In this controlled interventional study, 22 patients with schizophrenia and 22 healthy controls performed a standardized aerobic endurance training on bicycle ergometers over 12 weeks. Another group of 21 patients with schizophrenia played table soccer. Endurance capacity was measured with incremental cycle ergometry before and after the intervention and 3 months later. A specific set of outcome parameters was defined. The training stimuli can be assumed to be similar in both endurance groups. Endurance capacity improved significantly in the endurance groups, but not in the table soccer group. Patients and healthy controls showed comparable adaptations to endurance training, as assessed by physical working capacity and maximal achieved power. Differences were found in changes of performance at a lactate concentration of 3 mmol/l. Endurance training was feasible and effective in both groups. The principles and types of training that are usually applied to healthy controls need to be verified in patients with schizophrenia. Nevertheless, patients benefited from endurance training in terms of improvement of endurance capacity and reduction in the baseline deficit in comparison with healthy controls. Therefore, endurance training should be implemented in future therapy programs. These programs need to pay special attention to the differences between patients with schizophrenia and healthy controls.

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“…Contact‐loss was seen in all patients for both bicycle motion and step‐cycle motion ( p < 0.001), and the mean trend for contact‐loss for both activities were statistically significantly correlated ( p < 0.001, r < −0.82) with the corresponding tibial component compressive loads (Fig. A and C) defined by the studies Zhao et al and Kutzner et al…”

Section: Resultsmentioning

confidence: 67%

“…Data on tibial compressive load during step‐cycle motion and bicycle motion (ergometer bicycle with 70 Watt resistance) were acquired from the studies by Zhao et al and Kutzner et al using Geogebra (version 5.0.222, GeoGebra Institute, Linz, Austria) . Both studies measured in‐vivo tibial loads in patients with TKA by use of custom designed tibial components.…”

Section: Methodsmentioning

confidence: 99%

Oxford medial unicompartmental knees display contact‐loss during step‐cycle motion and bicycle motion: A dynamic radiostereometric study

Horsager

Kaptein

Jørgensen

et al. 2017

Journal Orthopaedic Research

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The Oxford medial unicompartmental knee is designed fully congruent, with the purpose of maintaining a large contact-area throughout motion and minimize wear. No other study has investigated this design feature in-vivo. We aimed to evaluate if contact-loss was introduced between the articulating surfaces of the Oxford medial unicompartmental knee during bicycle- and step-cycle motion, and whether this correlated with essential implant parameters, such as polyethylene (PE) wear, knee-loadings, and clinical outcome. To study contact-loss, 15 patients (12 males, mean age 69 years) with an Oxford medial unicompartmental knee (7 cemented, mean follow-up 4.4 years) were examined with use of dynamic radiostereometry (RSA) (10 frames/s). PE wear was measured from static RSA and clinical outcome was evaluated with American Knee Society Score (AKSS) and Oxford Knee Score (OKS). Data on knee-loadings were acquired from the literature. Contact-loss was deteced in all patients during both exercises, and the trend of contact-loss correlated with the knee-loadings. Median contact-loss was 0.8 mm (95%PI: 0.3; 1.5) for bicycle motion and 0.3 mm (95%PI: 0.24; 0.35) for step-cycle motion, and did not correlate with the PE wear rate of mean 0.06 mm/year. Possible in-congruency was seen in three patients. Clinical outcome scores correlated with contact-loss during step-cycle motion. In conclusion, contact-loss was seen in all patients indicating a clinical tolerance during load. Contact-loss followed the knee-loadings, which could explain why no correlation was seen with PE wear, as an increase in load was acommadated by an increase in contact-area (contact-loss reduction). The size of contact-loss may reflect clinical outcome. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:357-364, 2018.

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

Cited by 58 publications

References 26 publications

Spinal Loads during Cycling on an Ergometer

Spinal Loads during Cycling on an Ergometer

Endurance training in patients with schizophrenia and healthy controls: differences and similarities

Oxford medial unicompartmental knees display contact‐loss during step‐cycle motion and bicycle motion: A dynamic radiostereometric study

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