10
A full leg x-ray, with the patient in standing position, is recommended for preoperative
planning purposes. If this is not possible, an x-ray of the thigh, including the femoral head,
should be taken. X-ray images of the knee joint at three levels should be available for
planning the surgery. A tangential patellar view, a frontal view, and a view sagittal to the leg
axis must be recorded.
X-ray templates with scales of 1.15:1 (Lit. No. 1069) and 1:1 (Lit. No. 1585) (see page 56) are
available for preoperative planning. The lateral view of the condyles is decisive. If these are
no longer completely intact, the condylar width can be used instead. In doubtful cases, the
smaller implant should be selected to prevent the prosthesis components from protruding.
The size determination and the correct positioning of the prosthesis are normally controlled
intraoperatively using the relevant instruments, and planning may also be possible on the
unrestored opposite leg.
Important
All femoral and tibial component sizes can be combined with the next size up or down (see
product overview, starting page 57). This does not apply to combinations of sizes 2 and 4.
Large deviations of the femoral neck angle as well as severe deformities of femur and tibia
(e.g., posttraumatic axial deformities) must be taken into consideration while planning the
surgery.
Additional corrective osteotomies may be indicated, in rare cases of deformities away from
the knee joint that negatively influence the mechanical leg axis.
Preoperative Planning
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