Changes in Knee Measurements Between Egyptian and Western Population Clinical Trial
Official title:
Knee Posterior Femoral Condylar Offset and Tibial Slope of the Egyptian Population
this study is to compare the posterior condylar offset , posterior condylar offset ratio and tibial slope of Egyptian population with Asian and Western results.These results may be important to examine if contemporary total knee arthroplasty components match the anatomy of Egyptian populations or they are significantly different with the need of different prosthesis designs and geometrics.
Lateral knee x rays will be collected from the registry system of Assiut University Hospital
through Paxera pacs system . Posterior condylar offset, posterior condylar offset ratio and
tibial slope will be measured from the x rays.
In the sagittal plane, the femoral long axis will be drawn with equal distance to the
anterior-posterior edges of the femoral shaft. One line will be drawn parallel to the
anterior femoral shaft cortex and another parallel to the posterior femoral shaft cortex. A
third line will be drawn parallel to the posterior femoral shaft cortex line, but tangent to
the most posterior femoral condyles to represent the posterior condylar tangent line. The
anterior-posterior dimension of the distal femur is defined as the distance between the
anterior femoral shaft cortex line and the posterior femoral condyle tangent line . The
posterior femoral condyle offset (PCO) is determined as the distance between the posterior
femoral shaft cortex line and the posterior femoral condyle line, that is noted as PCO .The
posterior femoral condyle offset ratio (PCOR) is calculated as the ratio of the posterior
femoral condyle offset and the anterior-posterior dimension of the distal femur, i.e.,
PCO/ACP.
Tibial slope will be measured as follows; the tangent to the medial tibial plateau is
considered to be the proximal reference line. This is the line connecting the highest
anterior and posterior points of the medial plateau. The second reference is the axis of the
tibia, defined as a line through the middle of the shaft at 10 and 20 cm. The angle between
these two lines is the tibial slope.
Data of the cases will be collected as name, age and gender. The results will be collected
and will be compared with those of Asian and Western results. These results may be important
to examine if contemporary TKA components match the anatomy of Egyptian populations or they
are significantly different with the need of different prosthesis designs and geometrics.
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