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Design and evaluation of a new type of knee orthosis to align the mediolateral angle of the knee joint with osteoarthritis.

Esrafilian A, Karimi MT, Eshraghi A - Adv Orthop (2012)

Bottom Line: The results of the research showed that the adduction moment applied on the knee joint decreased while subjects walked with the new knee orthosis (P-value < 0.05).Conclusion.The new design of the knee brace can be used as an effective treatment to decrease the loads applied on the knee joint and to improve the alignment whilst walking.

View Article: PubMed Central - PubMed

Affiliation: Mechanical Engineering Department, Isfahan University of Technology, Isfahan, Iran.

ABSTRACT
Background. Osteoarthritis (OA) is a disease which influences the performance of the knee joint. Moreover, the force and moments applied on the joint increase in contrast to normal subjects. Various types of knee orthoses have been designed to solve the mentioned problems. However, there are other problems in terms of distal migration during walking and the alignment of the orthosis which cannot be changed following the use of brace. Therefore, the main aim of the research was to design an orthosis to solve the aforementioned problems. Method. A new type of knee orthosis was designed with a modular structure. Two patients with knee OA participated in this research project. The force applied on the foot, moment transmitted through the knee joint, and spatiotemporal gait parameters were measured by use of a motion analysis system. Results. The results of the research showed that the adduction moment applied on the knee joint decreased while subjects walked with the new knee orthosis (P-value < 0.05). Conclusion. The new design of the knee brace can be used as an effective treatment to decrease the loads applied on the knee joint and to improve the alignment whilst walking.

No MeSH data available.


Related in: MedlinePlus

The new design of the knee orthosis designed for patients with knee OA. C: the knee joint. D: the lower medial part of thigh shell. E: the upper lateral part of shank shell with the aligning screw. F: the lower medial part of the orthosis with the aligning screw.
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fig1: The new design of the knee orthosis designed for patients with knee OA. C: the knee joint. D: the lower medial part of thigh shell. E: the upper lateral part of shank shell with the aligning screw. F: the lower medial part of the orthosis with the aligning screw.

Mentions: The upper shell of the orthosis was made of polyethylene (high density) vacuumed on the positive cast of the patients' limb. It had two elastic straps which secured the orthosis on the leg (Figure 1). The upper shell of the orthosis worked as the third component of three-point pressure system. The lower shell of the orthosis consisted of two layers. The first layer was made of low-density polyethylene which was vacuumed over the positive cast. It was trimmed to cover the upper lateral and the lower medial parts of the leg. These areas were the locations of corrective forces used to align the limb. The second layer, which was made of high-density polyethylene, was vacuumed on the first layer. The first layer could be moved inside the second one by aligning screws in the upper lateral and lower medial sides of the leg. Therefore, the magnitude of the force could be adjusted according to the patient's need. The lower shell was secured on the leg by three elastic straps, Figure 1.


Design and evaluation of a new type of knee orthosis to align the mediolateral angle of the knee joint with osteoarthritis.

Esrafilian A, Karimi MT, Eshraghi A - Adv Orthop (2012)

The new design of the knee orthosis designed for patients with knee OA. C: the knee joint. D: the lower medial part of thigh shell. E: the upper lateral part of shank shell with the aligning screw. F: the lower medial part of the orthosis with the aligning screw.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3345217&req=5

fig1: The new design of the knee orthosis designed for patients with knee OA. C: the knee joint. D: the lower medial part of thigh shell. E: the upper lateral part of shank shell with the aligning screw. F: the lower medial part of the orthosis with the aligning screw.
Mentions: The upper shell of the orthosis was made of polyethylene (high density) vacuumed on the positive cast of the patients' limb. It had two elastic straps which secured the orthosis on the leg (Figure 1). The upper shell of the orthosis worked as the third component of three-point pressure system. The lower shell of the orthosis consisted of two layers. The first layer was made of low-density polyethylene which was vacuumed over the positive cast. It was trimmed to cover the upper lateral and the lower medial parts of the leg. These areas were the locations of corrective forces used to align the limb. The second layer, which was made of high-density polyethylene, was vacuumed on the first layer. The first layer could be moved inside the second one by aligning screws in the upper lateral and lower medial sides of the leg. Therefore, the magnitude of the force could be adjusted according to the patient's need. The lower shell was secured on the leg by three elastic straps, Figure 1.

Bottom Line: The results of the research showed that the adduction moment applied on the knee joint decreased while subjects walked with the new knee orthosis (P-value < 0.05).Conclusion.The new design of the knee brace can be used as an effective treatment to decrease the loads applied on the knee joint and to improve the alignment whilst walking.

View Article: PubMed Central - PubMed

Affiliation: Mechanical Engineering Department, Isfahan University of Technology, Isfahan, Iran.

ABSTRACT
Background. Osteoarthritis (OA) is a disease which influences the performance of the knee joint. Moreover, the force and moments applied on the joint increase in contrast to normal subjects. Various types of knee orthoses have been designed to solve the mentioned problems. However, there are other problems in terms of distal migration during walking and the alignment of the orthosis which cannot be changed following the use of brace. Therefore, the main aim of the research was to design an orthosis to solve the aforementioned problems. Method. A new type of knee orthosis was designed with a modular structure. Two patients with knee OA participated in this research project. The force applied on the foot, moment transmitted through the knee joint, and spatiotemporal gait parameters were measured by use of a motion analysis system. Results. The results of the research showed that the adduction moment applied on the knee joint decreased while subjects walked with the new knee orthosis (P-value < 0.05). Conclusion. The new design of the knee brace can be used as an effective treatment to decrease the loads applied on the knee joint and to improve the alignment whilst walking.

No MeSH data available.


Related in: MedlinePlus