الفهرس 
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Abstract
LLD have been discussed in the literature with respect to hip arthroplasty but there are few studies that have discussed LLD following TKA, (6) and since the basic principles of joint restoration are similar, we investigated the frequency and characteristics of limb-length changes occurring after unilateral TKA in patients varus deformity as it is the most common angular deformity the surgeons face during performing total knee arthroplasty. (4) The current study is clinical case series study which was conducted at Assiut University, Arthroplasty Unit, Orthopedic Department. The aim of the study was to predict LLD post-operatively by measuring the actual limb length, degree of varus deformity and the functional length. The sudy has included 70 cases of osteoarthritis patients with varus deformity that were listed for primary TKA. All patients had peformed Full-length, standing anteroposterior (AP) radiographs of the bilateral lower extremities pre and post-operatively following TKA. A marker was used to digitally scale the preoperative full-length radiograph. Limb-length measurements was performed from the center of the femoral head to the base of the tibial plafond for both the operative and nonoperative limbs to determine the functional length and from center of the femoral head to the center of the roof of the intercondylar notch to determine the anatomical femoral length also from the center of the tibial plateau to the base of the tibial plafond to determine the anatomical tibial length (Fig. 20). The mechanical axis was measured using the same digital radiography software from the intersection of the femoral and tibial mechanical axes. The mechanical axis for the femur was measured from the center of the femoral head to the center of the roof of the intercondylar notch. The mechanical axis for the tibia was measured from the center of the tibial plateau to the center of the tibial plafond We showed that there is no relation between the increase in the post-operative functional length and the implant itself but it is directly related to the degree of correction of both varus and flexion deformity. • There is significant increase in functional length (P<0.0001) despite the significant decrease in femoral length (P 0.0001). There is highly significant relation between degree of correction of varus deformity& change in functional length with (P<0.0001). There is highly significant relation between degree of correction of flexion deformity& change in functional length with (P<0.0001).