Total Hip Arthroplasty Flashcards
THA / THR
(Total Hip Arthroplasty/Replacement)
Removal of diseased hip joint and replacing it with an artificial / prosthetic one.
Successful outcome based on:
- Pt selection
- Type of implant
- Method of fixation
- Surgical technique
LOS
(Length of Stay)
*THA < 5 days
WBAT
(Weight Bearing As Tolerated) = 100% weight during amb
POD
(Post-Operative Day)
*THA: mobilize POD 1, 2 is too long
THA Goals
- Eradicate persistent pain
- Increase ROM
- Improve functional mobility
THA Surgical Indications
- Osteoarthritis (OA) *most common tx
- Rheumatoid Arthritis
- Avascular Necrosis (AVN)
- Abnormal muscle tone from cerebral palsy
OA
(Osteoarthritis)
Surgical indication of THA
Characterized by:
- Pain
- Stiffness –> reduced function
- Reduced ROM + crepitus
- Tenderness
- Boney enlargement
AVN
(Avascular Necrosis)
Surgical indication of THA
THA Contraindications
- Inadequate bone mass
- Inadequate periarticular support
- Serious medical risk factors
- Signs of infexn (= delayed healing)
- Lack of pt motivation to observe precautions and
complete rehab
Contraindication
Reason to withhold a medical tx bc it may be harmful to the pt
THA Surgical Procedures
- Spinal / Epidural anesthesia
- Spinal / epidural and psoas muscle block for
enhanced post-op control - PCA pump for 24-48hrs
PCA Pump
(Patient-Controlled Analgesia)
Form of implanted drug delivery
THA Types and Components
- Noncemented (preferred but least stable)
- Cemented (allows WB immediately after surgery
- Hybrid
Acetabular Shell
Liner
Femoral Head
Femoral Stem
NWB
(Non weight bearing)
PWB
(Partial weight bearing) = 30-50% weight during amb
FWB
(Full weight bearing)
TDWB
(Touch Down Weight Bearing) = 20% weight during amb;
WB onto metatarsal heads instead of heel
THA Surgical Approaches and Analgesia Choices
Incision > 10 cm
- Posterolateral
- Anterolateral
- Anterior
- Transtrochanteric
- ——————- - PCA Pump
- Femoral Nerve Sheath Block (FNB)*
- Continuous epidural analgesia
Lateral Decubitus Postion
Side-lying
THA: Posterolateral Approach
(B/w glute max and med)
Adv:
- Faster ambulation
- Spares abductors (Hip Abd Pillow ~30*)
- -> facilitates congruency
- Wide exposure / visualization
Disadv:
- Antalgic gait
- Higher rates of dislocation
THA: Anterolateral Approach
(B/w glute med and TFL)
Adv:
- Visibility minus posterior dislocation
- No hip abd pillows needed
Disadv:
- Increased heterotropic bone formation
- Increased blood loss
- Longer operative times
PRECAUTIONS, AVOID:
- Hip ER*
- Hip Flexion
THA: PRECAUTIONS
AVOID:
- Hip IR
- Hip Adduction
- Hip Flexion
THA: Anterior Approach
Adv: -Minimally invasive --> no cutting of muscles or tendons -Less soft tissue damage -Less blood loss
Disadv:
-More technically demanding
THA: Transtrochanteric Approach
Disadv:
-Post op limp (gluteal nerve or flap avulsion)
PT Patient Mgmt
- Pathology
- Impairment
- Functional Limitation
- Disability