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ting the femoral shaft 10 cm above the joint

line (fig. 2) and the second line was drawn

from the midpoint of the tibial spines to a

point bisecting the tibial shaft 10 cm below

the joint line [9, 12, 25]. Finally, these FTA

angles on the varus and valgus stress radio-

graphs were compared between the groups.

The femorotibial separation angle (TFS),

was the angle between the lines tangential to

the distal condyles and the tibial plateau arti-

cular surfaces (fig. 3). It was measured on

varus and valgus stress X-ray (measured

angles with open arms pointing to the medial

side of the knee result in negative values).

The medial and lateral compartment joint

space distances’ on the varus-valgus stress

radiographs were measured in millimeters

[26, 27]. Points that are described by Martin

[26] were chosen. Medial points (a,b) 5 mm

and lateral points (A,B) 10 mm from the

outer margins of the tibial plateau were

selected, and in each compartment the dis-

tance between the selected points was mea-

sured, respectively. The gaps between the

opposed subchondral plates of the compart-

ments on the varus-valgus stress were also

calculated as a ratio (fig. 4).

ARE STRESS X-RAYS USEFUL TO PLANMEDIAL SOFT TISSUE RELEASE PROCEDURES IN TOTAL KNEE ARTHROPLASTY?

13

Fig. 2 : Measurement protocol of the anatomi-

cal femorotibial angle on stress radiographs.

Fig. 3 : Measurement protocol of the tibiofe-

moral seperation angle on stress radiographs.

Fig. 4 : Measurement protocol of the com-

partment joint space widths’ on stress radio-

graphs.