The tibia is rotated 180° and fused to the femur Hillmann and colleagues published a report comparing endoprosthetic replacement to rotationplasty in 67 patients, both adults and children, with malignant tumours of the distal femur or proximal tibia.
Source: wiktionary
Rotationplasty, or a turnabout procedure, is a typical option for children with congenital limb deficiencies, specifically PFFD, as well as for those with bony tumors of the proximal tibia or distal femur.
Source: wiktionary
Of the three modified amputation techniques listed, the Van Nes rotationplasty leaves the longest residual stump, provides an effective “knee joint”, and is a viable alternative to above-knee amputations in select patients
Source: wiktionary