Monitoring the load on a telemeterised vertebral body replacement for a period of up to 65 months

Rohlmann, A.; Dreischarf, Marcel; Zander, Thomas; Graichen, F.; Strube, Patrick; Schmidt, Hendrik; Bergmann, G.

doi:10.1007/s00586-013-3057-1

Cited by 34 publications

(25 citation statements)

References 18 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of this implantation, the compressive force also causes a bending and torsional moment. The kyphosis angle of the thoracic spine increased during the measuring period [17]. This led to increased resultant forces for standing and walking in the temporal course of the measurements.…”

Section: Discussionmentioning

confidence: 94%

Activities of Everyday Life with High Spinal Loads

et al. 2014

View full text Add to dashboard Cite

Activities with high spinal loads should be avoided by patients with back problems. Awareness about these activities and knowledge of the associated loads are important for the proper design and pre-clinical testing of spinal implants. The loads on an instrumented vertebral body replacement have been telemetrically measured for approximately 1000 combinations of activities and parameters in 5 patients over a period up to 65 months postoperatively. A database containing, among others, extreme values for load components in more than 13,500 datasets was searched for 10 activities that cause the highest resultant force, bending moment, torsional moment, or shear force in an anatomical direction. The following activities caused high resultant forces: lifting a weight from the ground, forward elevation of straight arms with a weight in hands, moving a weight laterally in front of the body with hanging arms, changing the body position, staircase walking, tying shoes, and upper body flexion. All activities have in common that the center of mass of the upper body was moved anteriorly. Forces up to 1650 N were measured for these activities of daily life. However, there was a large intra- and inter-individual variation in the implant loads for the various activities depending on how exercises were performed. Measured shear forces were usually higher in the posterior direction than in the anterior direction. Activities with high resultant forces usually caused high values of other load components.

show abstract

Section: Discussionmentioning

confidence: 94%

Activities of Everyday Life with High Spinal Loads

et al. 2014

View full text Add to dashboard Cite

show abstract

“…To estimate loads on spine, in vivo studies, though valuable, are costly, limited and invasive Rohlmann et al, 2013;Sato et al, 1999). Musculoskeletal models have emerged as robust and relatively accurate alternatives.…”

Section: Introductionmentioning

confidence: 99%

Effects of sex, age, body height and body weight on spinal loads: Sensitivity analyses in a subject-specific trunk musculoskeletal model

Ghezelbash

Shirazi‐Adl

Arjmand

et al. 2016

Journal of Biomechanics

View full text Add to dashboard Cite

Five symmetric sagittal loading conditions were considered, and main effect plots and analyses of variance were employed to identify influential parameters. In all 5 tasks simulated, BW (98.9% in compression and 96.1% in shear) had the greatest effect on spinal loads at the L4-L5 and L5-S1 levels followed by sex (0.7% in compression and 2.1% in shear), BH (0.4% in compression and 1.5% in shear) and finally age (<5.4%). At identical BH and BW, spinal loads in females were slightly greater than those in males by ~4.7% in compression and ~8.7% in shear. In tasks with no loads in hands, BW-normalized spinal loads further increased with BW highlighting the exponential increase in spinal loads with BW that indicates the greater risk of back disorders especially in obese individuals. Uneven distribution of weight in obese subjects, with more 17 BW placed at the lower trunk, further (though slightly <7.5%) increased spinal loads.

show abstract

“…Lifting one cranially stretched arm and the contralateral leg in the prone position caused a median force increase of 100 N and is also an exercise that can be performed shortly after surgery. However, lifting both extended legs and lifting the pelvis in the supine position caused median force increases of more than 200 N. These exercises create a resultant force that might be even greater than that during walking [15], [22]. Walking is considered to be the most important activity with relatively high loads that everyone should perform daily.…”

Section: Discussionmentioning

confidence: 99%

Spinal Loads during Post-Operative Physiotherapeutic Exercises

et al. 2014

View full text Add to dashboard Cite

After spinal surgery, physiotherapeutic exercises are performed to achieve a rapid return to normal life. One important aim of treatment is to regain muscle strength, but it is known that muscle forces increase the spinal loads to potentially hazardous levels. It has not yet been clarified which exercises cause high spinal forces and thus endanger the surgical outcome. The loads on vertebral body replacements were measured in 5 patients during eleven physiotherapeutic exercises, performed in the supine, prone, or lateral position or on all fours (kneeling on the hands and knees). Low resultant forces on the vertebral body replacement were measured for the following exercises: lifting one straight leg in the supine position, abduction of the leg in the lateral position, outstretching one leg in the all-fours position, and hollowing the back in the all-fours position. From the biomechanical point of view, these exercises can be performed shortly after surgery. Implant forces similar or even greater than those for walking were measured during: lifting both legs, lifting the pelvis in the supine position, outstretching one arm with or without simultaneously outstretching the contralateral leg in the all-fours position, and arching the back in the all-fours position. These exercises should not be performed shortly after spine surgery.

show abstract

Monitoring the load on a telemeterised vertebral body replacement for a period of up to 65 months

Cited by 34 publications

References 18 publications

Activities of Everyday Life with High Spinal Loads

Activities of Everyday Life with High Spinal Loads

Effects of sex, age, body height and body weight on spinal loads: Sensitivity analyses in a subject-specific trunk musculoskeletal model

Spinal Loads during Post-Operative Physiotherapeutic Exercises

Contact Info

Product

Resources

About