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in Flexion toin Flexion tobe stable:be stable:(flexion gap)(flexion gap)resect more medial condyleresect more medial condyle femoral component in ERfemoral component in ER Gait with the leg & foot in ERGait with the leg & foot in ER
So, when you transform So, when you transform
an an anatomicalanatomical (extraarticular) Femur (extraarticular) Femur Valgum (oblique joint line)Valgum (oblique joint line)
into a into a prosthetic prosthetic Normo FemurNormo Femur
in order to be stablein order to be stable
induce rotation of the femoral implant in the horizontal plane
FIRST MESSAGE
DEFORMED KNEESDEFORMED KNEESin Current Practicein Current Practice
Genu VarumGenu Varum
mostly a mostly a TibialTibial deformity deformity
to be simple:to be simple: Normo FemurNormo Femur Tibia VarumTibia Varum
tibial deformity:tibial deformity:change the tibial joint line change the tibial joint line from oblique to perpendicularfrom oblique to perpendicular
medial release (sleeve)medial release (sleeve)
(NB: in some severe tibia varum, you may have to (NB: in some severe tibia varum, you may have to consider an osteotomy)consider an osteotomy)
in flexion:in flexion:
with a strong released, with a strong released, elongated MCLelongated MCL
no change in femoral implant no change in femoral implant rotationrotation
no problem for the patellano problem for the patella
Genu Genu ValgumValgum
FemurFemur Valgum Valgum Normo TibiaNormo Tibia
Femur valgum EA deformityFemur valgum EA deformity Prosthetic normo femurProsthetic normo femur
- reorientate the joint from - reorientate the joint from oblique (oblique (anatomicalanatomical) into ) into horizontal (horizontal (prostheticprosthetic))
- lateral release (difficult)- lateral release (difficult)
- compensate for the lateral - compensate for the lateral condyle bone missingcondyle bone missing