wk9 Lower limb Flashcards
any evidence for post op management of THA/TKA?
Study done by Chen, suggested that early mobilisation on day 0 post op is better than the day 1 post op.
Limitations of Chen’s study?
- Mixed group - i.e. THA and TKA
- No specific intervention was described
- Total number of group received intervention (Day0) was significantly less than the control group (Day1)
4 major components of implant/ prosthesis
- Cup
- Cup liner
- Stem
- Ball
pros of rehabilitation for THA
- improving mobility
- reducing pain
- reducing limp
cons of rehab for THA
- wear and tear (longevity)
2. surgical risk (e.g. dislocation, break-down wounds)
types of materials used for THA implant
- Metal on Plastic
- Metal on Ceramic
- Metal on Metal
- Ceramic on Ceramic
precaution for selecting Metal on metal implant?
check metal sensitivity - it might increase metal concentration in the blood
Advantage and disadvantage of metal on metal
adv-long lasting
disadv- incr risk of metal concentration
Advantage and disadvantage of ceramic on ceramic
adv - lighter than metal, no risk of increased metal concentration
Disadvan- can be broken off following a trauma
is risk or complication following THA high?
No, very low approx 5%, even if occur, can be managed well
what are possible complications for THA
Infection
Dislocation
Blood clot or DVT
incidence rate of blood clot or DVT
30%
when is Dislocation risk highest?
in the first 6 weeks - maybe due to muscles around hip joint is not stable enough to hold
Management of DVT or blood clot
- Early mobilisation
- Elastic stocking
- Aspirin for 6 wks
Why have a hip joint replacement?
pain with activity pain at rest loss of movement loss of strength Limp OA/RA/Fracture (displaced intra-capsular fracture NOF)
Brief description of THA surgery
- dislocation of head of femur from acetabulum
- remove the head of femur
- replace acetabulum with cup and cup liner
- insert stem and ball into femur
- relocate it in place
Incision site (surgical approach) for THA
over Greater Trochanter
Anterior approach
Posterior approach
movements increasing risk of dislocation for each of Anterior and Posterior approach
Anterior = Extension, Adduction, External Rotation Posterior = Flexion, Adduction, Internal rotation