|
Tibial plateau width [mm]
|
60-70
|
46-56
|
match screw length, narrow and strait plate design necessary
|
|
Tibia valga [°]
|
0
|
3.5
|
valgus overcorrection more likely
|
|
Knee range of motion [°]
|
0-0-140
|
0-35-72
|
dorsal plate positioning after open wedge HTO suggested due to increased loading of the posterior tibial plateau
|
|
Tibial tuberosity dimension adding to the anterio-posterior diameter of the tibial head [%]
|
10-15
|
30-35
|
anterior plate misplacement more likely
|
|
Tibial tuberosity height distance in relation to the joint line [mm]
|
25-30
|
10-15
|
anterior plate misplacement more likely
|
|
Posterior slope of the posterior articular surface [°]
|
0-10
|
20 ± 3
|
narrow and straight plate design necessary for posterior placement
|
|
Biomechanical properties of the tibial head
|
elastic cortical bone, exuberant amount of spongious bone
|
brittle cortical bone, few spongious bone
|
bicortical proximal screw placement mandatory to avoid fracture and dislocation, biplanar osteotomy mandatory regardless of the desired direction of correction
|
|
Musculature of the hind limb
|
remote from bony knee structures
|
voluminous on medial and lateral side of the femur
|
distal femoral and proximal lateral tibial osteotomy almost impossible, stay on the medial side of the proximal tibia for any desired correction angle
|
|
Trochlea ridge
|
lateral ridge extending further laterally and anteriorly
|
medial ridge extending further cranially and dorsally than lateral ridge
|
higher propensity of patella instability after valgus correction
|
