Imaging and motion analysis system aids orthopedic diagnosis

OCTOBER 15, 2009--SIMI Reality Motion Systems (Munich, Germany) has developed an analysis system for the dynamic, non-invasive diagnosis and monitoring of musculoskeletal dysfunction.

Oct 15th, 2009

OCTOBER 15, 2009--SIMI Reality Motion Systems (Munich, Germany; www.simi.com) has developed a motion analysis system for the dynamic, non-invasive diagnosis and monitoring of musculoskeletal dysfunction. The system analyzes video data from one or more digital cameras and generates data such as joint angles, accelerations, axle symmetries, and joint torque or stress. Data can be compared with standard values in biomedical literature to identify possible dysfunctions.

The system is equipped with one (2-D version) or more (3-D version) Pike F-032B cameras from Allied Vision Technologies (Stadtroda, Germany; www.alliedvisiontec.com), operating at up to 200 frames/s. The cameras are connected to a desktop computer with an IEEE 1394b FireWire or a fiberoptic interface. The test subject is outfitted with markings on crucial joints and then executes a particular sequence, such as taking a few normal steps, in front of the camera. The SIMI Motion Software analyzes the image data from the camera and derives the joint movements from the progression of the markings.

Graphic representations and tools simplify diagnosis for the physician who can quickly and precisely find the patient's weak points. Factors such as ambulation cycles and joint movements, translations, or rotations can be examined to better visualize joint stress.

The system can synchronize with other medical measuring devices such as force plates, foot pressure measurement devices, or electromyographs. Pre- and postoperative comparisons can be performed on patients, allowing for evaluation of the surgery's success, and doctors can take measurements at regular intervals to check and document the progress of rehabilitation.

The SIMI Motion System has also been applied in basic research by Andrey Irintchev, director of the Neuroscientific Research Laboratory of the ENT Clinic at the University of Jena Hospital (Jena, Germany). He has developed a method for scientifically measuring, comparing, and documenting motor disruptions and the healing processes in laboratory mice. He has studied disfunctions resulting from nerve or spinal cord damage, as well as possible treatment therapies.

-- Posted by Conard Holton, Vision Systems Design, www.vision-systems.com

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