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Hi all,
I'm currently trying to write a MATLAB code to calculate the angles of flexion and extension within the knee range of motion. The procedure so far is very basic, it involves a cluster of markers on both the thigh and the lower leg, as well as an anatomical marker on the ankle. The patient's leg is taken through a range of motion through a single plane (thus making it a 2D problem as opposed to a 3D one). The video is recorded, the trajectories are traced and time-dependent Cartesian dimensions of markers are output into an Excel document.
The aim is to calculate the hip joint centre and knee joint centre, then use these points along with the ankle coordinates to calculate the angle formed between the two separate vectors that join the hip joint centre and ankle to the knee joint centre respectively.
I've been able to follow up on some of the procedures outlined in Shea et al (1997) and Piazza et al (2001) etc, and therefore have been able to calculate the hip joint centre. When it comes to the knee joint centre however, the maths is a little beyond me (I'm an undergrad student intern).
I know many others have worked on similar and often more complex projects in the past, so I'm wondering if any of you may be able to help me in either understanding the theory behind the calculation of the knee joint centre, or otherwise have some code that I could perhaps take a look at and be able to apply to the code that I'm writing?
Any help would me much appreciated.
Thanks in advance,
Manaal
manaal-fatima@hotmail.com
I'm currently trying to write a MATLAB code to calculate the angles of flexion and extension within the knee range of motion. The procedure so far is very basic, it involves a cluster of markers on both the thigh and the lower leg, as well as an anatomical marker on the ankle. The patient's leg is taken through a range of motion through a single plane (thus making it a 2D problem as opposed to a 3D one). The video is recorded, the trajectories are traced and time-dependent Cartesian dimensions of markers are output into an Excel document.
The aim is to calculate the hip joint centre and knee joint centre, then use these points along with the ankle coordinates to calculate the angle formed between the two separate vectors that join the hip joint centre and ankle to the knee joint centre respectively.
I've been able to follow up on some of the procedures outlined in Shea et al (1997) and Piazza et al (2001) etc, and therefore have been able to calculate the hip joint centre. When it comes to the knee joint centre however, the maths is a little beyond me (I'm an undergrad student intern).
I know many others have worked on similar and often more complex projects in the past, so I'm wondering if any of you may be able to help me in either understanding the theory behind the calculation of the knee joint centre, or otherwise have some code that I could perhaps take a look at and be able to apply to the code that I'm writing?
Any help would me much appreciated.
Thanks in advance,
Manaal
manaal-fatima@hotmail.com
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