Validation of a novel activity monitor in impaired, slow-walking, crutch-supported patients

Laarhoven, Simon van; Lipperts, M; Bolink, Stijn; Senden, Rachel; Heyligers, Ide C.; Grimm, Bernd

doi:10.1016/j.rehab.2016.05.006

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…The position of the sensor was at the mid-thigh between the trochanter and lateral condyle, with the y-axis of the sensor along the axis of the femur (van Laarhoven et al. 2016). The sensor was worn during waking hours for a minimum of 8 hours per day.…”

Section: Methodsmentioning

confidence: 99%

Does the physical activity profile change in patients with hip dysplasia from before to 1 year after periacetabular osteotomy?

et al. 2018

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Background and purpose — Knowledge of physical activity profiles among patients with hip dysplasia is lacking. We investigated whether patients with hip dysplasia change physical activity profile from before to 1 year after periacetabular osteotomy. Furthermore, we investigated associations between change in accelerometer-based physical activity and change in self-reported participation in preferred physical activities (PA).Patients and methods — Physical activity was objectively measured at very low to high intensity levels with accelerometer-based sensors. Subjectively, PA was recorded with Copenhagen Hip and Groin Outcome Score (HAGOS) in 77 patients. Associations between the 2 were analyzed with simple linear regression analyses.Results — Changes in accelerometer-based physical activity ranged from –2.2 to 4.0% points at all intensity levels from baseline to 1-year follow-up. These changes represent very small effect sizes (–0.16 to 0.14). In contrast, self-reported PA showed a statistically and clinically relevant increase of 22 (CI 14–29) HAGOS PA points 1 year post-surgery. Associations between change in accelerometer-based physical activity and change in self-reported PA were, however, not statistically significant and correspond to a percentage change in physical activity of only –0.87% to 0.65% for a change of 10 HAGOS PA points.Interpretation — Patients with hip dysplasia do not seem to change physical activity profile 1 year post-surgery if measured with objective accelerometer-based sensors. This is interesting as self-reported PA indicates that patients’ ability to participate in physical activity increases, suggesting that this increased self-reported participatory capacity is not manifested as increased objectively measured physical activity.

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Section: Methodsmentioning

confidence: 99%

Does the physical activity profile change in patients with hip dysplasia from before to 1 year after periacetabular osteotomy?

et al. 2018

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“…Outcome consisted of quantitative parameters (time spent walking and cycling in seconds, the number of steps and sit-stand transfers) and qualitative parameters (cadence in steps per minute and high-intensity peak counts in numbers). This technique was clinically validated by Lipperts et al 35 and van Laarhoven et al 36 in healthy subjects and subjects who had undergone unilateral total joint arthroplasty, using video observation as the gold standard. The studies showed an excellent accuracy (>97%) in determining activity levels with this technique in a semi-free setting.…”

Section: Methodsmentioning

confidence: 99%

Metal ion concentrations after metal-on-metal hip arthroplasty are not correlated with habitual physical activity levels

et al. 2018

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Introduction: Metal-on-metal (MoM) hip arthroplasties have shown high clinical failure rates with many patients at risk for a revision and under surveillance for high metal ion concentrations. Implant wear releasing such ions is assumed to be a function of use, i.e. the patient’s physical activity. This study aimed to assess whether habitual physical activity levels of MoM patients are correlated with metal ion concentrations and are higher in patients with high (at risk) than in patients with low (safe) metal ion concentrations. Methods: A cohort study was conducted of patients with any type of MoM hip prosthesis. Metal ion concentrations were determined using ICP-MS. Habitual physical activity of subjects was measured in daily living using an acceleration-based activity monitor. Outcome consisted of quantitative and qualitative activity parameters. Results: In total, 62 patients were included. Mean age at surgery was 60.8 ± 9.3 years and follow-up was 6.3 ± 1.4 years. Cobalt concentrations were highly elevated overall (112.4 ± 137.9 nmol/L) and significantly more in bilateral (184.8 ± 106.5 nmol/L) than in unilateral cases (87.8 ± 139.4 nmol/L). No correlations were found between physical activity parameters and metal ion concentrations. Subgroup analysis of patients with low versus high cobalt concentration showed no significant differences in habitual physical activity. Discussion: No correlation was found between physical activity levels and metal ion concentrations. Implant use by normal habitual activities of daily living seems not to influence metal ion concentrations.

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“…For this study intensity peak counts were accounted for events <2, ≥2, ≥3, and ≥8 g. This classification was chosen as events more than equal to 2 g do not usually appear during normal activities like walking but are common with impacts from, for example, sports or stumbles. The AM method used was found to work reliably in identifying activities in a semi‐free setting compared to human observers, with a classification accuracy of more than 97% 21,22 . In addition, activity monitoring following this or similar protocols has shown its value for research and outcome assessment in current literature 23,24 …”

Section: Methodsmentioning

confidence: 96%

Quality, but not quantity of physical activity is associated with metal ion concentrations in unilateral hip resurfacing

Jelsma

Schotanus

Kuijk³

et al. 2020

Journal Orthopaedic Research

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Little is known about the influence of physical activity (PA) on metal ion concentrations in subjects with metal‐on‐metal hip arthroplasty. Implant wear is thought to be a function of use and thus of patient activity levels. It is hypothesized that daily habitual PA of patients with hip resurfacing arthroplasty (HRA) is associated with metal ion concentrations. Therefore a study was conducted in patients with a unilateral HRA at 10‐years follow‐up. Blood metal ion concentrations were determined. An acceleration‐based activity monitor was used to measure PA in daily life. The cohort consisted of 12 males (75%) and 4 females (25%) with a median age at surgery of 55.5 ± 9.7 years [43.0–67.9] and a median follow‐up of 9.9 ± 1.0 years [9.1–10.9]. The median cobalt and chromium ion concentrations were 25 ± 13 and 38 ± 28 nmol/L. A significant association between sit‐stand transfers and high‐intensity peaks with cobalt ion concentrations were found. Regarding PA and metal ion concentrations as a proxy of wear in HRA, specific activities like transfers or qualitative aspects of activity behavior like intensity, seem to matter more than the quantity of low‐intensity activities like walking or cycling. This suggests that patients may safely engage in such activities to achieve important general health benefits and quality of life.

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Validation of a novel activity monitor in impaired, slow-walking, crutch-supported patients

Cited by 14 publications

References 27 publications

Does the physical activity profile change in patients with hip dysplasia from before to 1 year after periacetabular osteotomy?

Does the physical activity profile change in patients with hip dysplasia from before to 1 year after periacetabular osteotomy?

Metal ion concentrations after metal-on-metal hip arthroplasty are not correlated with habitual physical activity levels

Quality, but not quantity of physical activity is associated with metal ion concentrations in unilateral hip resurfacing

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