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Customer Requirements Summary:

Our “normal” ranges of motion to model at the hip, knee ankle are:

   Hip Flexion: 115–125 deg.

   Hip Abduction: 50–60 deg (with knee flexed)

   Hip Adduction: 15–30 deg.

   Hip Inward Rotation:  30–60 deg.

   Hip Outward Rotation:  30–45 deg.

   Knee Flexion: 125–135 deg.

   Ankle Dorsiflexion: 15–20 deg. (with knee flexed)

   Ankle Plantarflexion: 50 deg.

   Subtalar motion: ± 15 degrees inversion/eversion

Deformities to model statically outside of joint motion:

   Genu Valgum (knock knees: frontal deformity up to 30 degrees)

   Genu Varum (bowlegged: frontal deformity up to 30 degrees, opposite of
               above)

   Tibial Torsion: Twist of Tibia (± 45 degrees). Example of above is
     outward tibial torsion. Note that feet should point forward when knees
     point forward.

   Femoral torsion is similar (± 45 degrees) but occurs at femur.

For more detail read the entire document:

Section 3 - Customer Requirements(.pdf)
Authored by Brad Hansen and Chad Taylor