This figure represents the original locations of the EF pins 1, 2, 5 and 6 and compares these data against where the pins should be placed, after analysing the results.

The recommended locations of EF pins 1, 2, 5 and 6 are described below:

• Pin 1 – inserted anterior to posterior within the distal femur, 90 mm ± proximal to the proximal pole of the patella and 3 mm ± medially.

• Pin 2 – inserted anterior to posterior with the distal femur, 55 mm ± proximal to the proximal pole of the patella and 2 mm ± laterally.

• Pin 5 – inserted anterior to posterior in the proximal tibia; 20 mm ± distal to the tibial tuberosity and 2 mm ± medially, at an oblique angle.

• Pin 6 – inserted anterior to posterior in the proximal tibia, 35 mm ± distally to pin 5 and 2 mm ± medially, at an oblique angle.