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Evaluation of the Reboocon Intuy knee

Brugman, Aniek (2023) Evaluation of the Reboocon Intuy knee.

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Embargo date:1 September 2031
Abstract:Individuals with unilateral transfemoral amputation have a high risk of developing physical problems, like osteoarthritis and back pain due to them loading their sound limb more than their prosthetic limb. The use of active microprocessor-controlled prosthetic knees (A-MPK) is thought to improve gait symmetry and therefore lower the strain and wear on the sound limb joints. In 2018 Reboocon Bionics brought a new powered knee prosthesis to the market: the Intuy knee (IK), being the second commercially available A-MPK. It is expected that transfemoral amputees will benefit from this knee compared to passive knees since the IK provides resistance as well as active torque, possibly leading to more symmetry in joint angles, torques, and muscle activation. This research describes an evaluation of the Intuy knee. The IK was evaluated by analysing joint kinematics, muscle activation, and ground reaction forces, using musculoskeletal modelling. Data was collected while the two subjects performed three different movements using the IK: level-walking, stepping over various objects, and rising from a chair. This data was then compared to that of the subjects’ daily use prostheses, passive MPKs (P-MPK). A secondary goal of this research was to explore the possibility of using personalized instructions and prosthesis fine-tuning to optimize the use of the IK. Based on the spatio-temporal gait parameters the IK showed promising results, though based on the symmetry in joint kinematics neither the IK nor the P-MPKs seemed superior over the other in level-walking. Personalized instructions and prosthesis fine-tuning influenced the results, positively in respect to certain aspects, negatively to others. The IK supports the user during step-over-object movements, however this requires more practise than the subjects in this study received. For one subjects the IK lowered sound limb loading during the sit-to-stand movement, while for the other subject no significant difference was found. Based on the data alone it cannot be stated whether the IK is superior to passive knee prostheses, however taking the subjects’ personal experiences into account the IK shows potential.
Item Type:Essay (Master)
Reboocon Bionics, Delft, the Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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