Knee Replacement
Indications
• The main indication for replacement is pain
especially if combined with deformity and
instability.
Types of replacement
• 1-partial replacement, the role of
unicompartmental replacement has yet to be
firmly established.Following a successful
operation, relief of pain can be impressive, but
it is reserved for older patients.
• 2-minimally constrained total replacement
• 3-constrained joints
• 4-minimally invasive total knee replacement
Minimally constrained total
replacement
stability provided by prosthesis and some by
• preservation of knee ligaments.
• ACL alone or both ACL and PCL are removed
• All articular surfaces are replaced with metal
on femoral side, polyethylene on a metal tray
on tibial side and polyethylene alone on the
patella.
Constrained joints
• Artificial joints with fixed hinges are used
when there is marked bone loss and severe
instability
• The lack of rotation places severe stress on
bone / implants interfaces and they are liable to
loosen, to break or to erode tibial or femoral
shafts.
Minimally invasive total knee
replacement
• Not widely used
• Early result suggest that provide some benefits
over conventional total joint replacement: less
pain ,faster recovery, better quadriceps strength
and a better range of movement.
complications
• 1.DVT
• 2.Infection
• 3.lossening
4.Patellar problems
a.Recurrent patellar subluxation ordislocation
b.Complications associated with patellar resurfacing,
such as lossening of the prosthetic component,
fracture of the remaining bony patella, and
catching of soft tissue between the patella and the
femur.