Orthopedics Flashcards
What are the 3 types of bones?
- Long bones
- Short bones
- Flat bones
What are the 3 layers of the bone?
- Periosteum: The outside layer/membrane where muscles, tendons, and nerve endings attach
- Compact bone layer: Mineralized; Provide strength and integrity
- Sponge bone: Bone marrow; Contains blood vessels
What are alternative terms for bone growth?
Ossification or osteogenesis
When does bone growth start after conception?
8 weeks after conception
What are the 3 cell types involved in bone growth?
- Osteoblasts: Bone-forming
- Osteocytes: Mature cells
- Osteoclasts: Break down and reabsorb bone
What kind of hip fractures are good candidates for hip replacement surgery?
Fractures on the neck of the femur or subtrochanteric fractures.
What kind of hip fractures are not good candidates for hip replacement surgery?
Trochanteric fracutres (greater or lesser trochanters)
What are the 3 phases of bone growth post-fracture?
- Reactive phase (Acute): Inflammation and granulation (formation of new bone)
- Reparative phase (weeks to months): Periosteum forms osteoblasts, which forms new tissue
- Re-modelling phase (3-5 years): Thickening of the fracture site and remodelling of the vasculature
What are the main treatments for fractures?
Immobilization and surgical intervention Sufficient blood supply (nutrition and sleep) Energy (depleted by healing) Protein supplement Weight bearing (appropriate)
What is the only type of fractures that are non-surgical?
Undisplaced fractures
How are stable undisplaced fractures (e.g. minor spinal fracture) treated?
Managed by protection alone with the need for reduction or immobilization.
How are unstable undisplaced fractures (e.g. radius fracture) treated?
Require positioning/immobilization but not reduction.
What is the goal of surgical treatment of fractures?
Effective and precise stabilization for optimal recovery and resolution of function.
When do fractures require surgical intervention?
When bony fragments cannot be approximated accurately in a closed manner
What is open reduction internal fixation?
Open surgery of the fracture, where the bony fragments are internally fixed using pins and screws
What is the Ilizarov procedure?
A leg-lengthening procedure where the bone is cut surgically and the body is encouraged to close the gap between the bones, 1 mm of bone distraction/lengthening per day
What level of weight-bearing is prescribed for patients going through the Ilizarov procedure?
Weight bear as tolerated (WBAT) – Required to stimulate osteogenesis
What are the OT roles in caring for patients going through the Ilizarov procedure?
- Fabrication of foot plate – High risk for foot drop and plantar-flexion contracture
- Wound care
- Compression to manage edema
- Aid with body image acceptance
- Clothing modifications
What is arthroscopy?
Using small cameras to investigate or assist in surgical repair
What is arthroplasty?
Joint replacements
When is an arthroplasty required?
- When conservative treatments have failed
2. Patient continues to have pain, stiffness, and functional impairments
The number of total hip replacement surgeries are [decreasing/increasing].
Increasing, due to the increasing aging population.
What is the most common responsible diagnoses for total hip replacement surgeries?
Arthritis and hip fracture
What is the most common responsible diagnoses for knee replacment surgeries?
Arthritis
In total arthroplasty, which structures are replaced?
Both articulating surfaces, e.g. part of the femur, the femoral head, and the acetabular in total hip replacement
In hemi-arthroplasty, which structures are replaced?
Only one articular surface is replaced, e.g. Just the acetabulum or the femoral head (Austin Moore prosthesis)
When is cemented hip hardware used?
For people who have osteoporosis or osteopenia, and have weak bones
What are the pros and cons of cemented hip hardware?
More stability in the beginning
Increases risk of infection
What are the weight-bearing recommendations for cemented hip implant?
Weight-bear as tolerated (WBAT)
What are the weight-bearing recommendations for cementless hip implant?
Depends on the growth of the porous bone stability – Possibly initially non-weight bearing (NWB), and/or 6-12 weeks of partial weight bearing (PWB)
What are hybrid hip implants?
Femoral portion cemented, acetabulum uncemented
What are the weight-bearing recommendations for hybrid hip implants?
4-6 weeks of partial weight bearing (PWB)
What types of walking aids would a non-weight bearing (NWB) individual need?
Bilateral gait aids, e.g. 2WW, 4WW, crutches.
What is toe-touch weight bearing (TTWB) or touch-down weight bearing (TDWB)?
Allowed to put part of the affected lower extremity on the ground for balance or proprioception only. i.e. Touching down only for sensation purposes.
What types of walking aids would a toe-touch or touch-down weight bearing (TTWB/TDWB) individual need?
Bilateral gait aids, e.g. 2WW, 4WW, crutches.
What condition could arise from TTWB?
Tight gastrocnemius muscles
What is a precaution for TDWB?
Not putting too much weight on lower extremity
Which activity allows weight bearing of 50% of the body weight?
Standing with body weight evenly supported by both feet
What is partial weight bearing (PWB)?
Supporting < 50% or 50% of body weight with the affected limb. No walking.
What is weight bearing as tolerated (WBAT)?
Placing up to full body weight on the affected limb but not all the time, due to pain, endurance, and ROM. May use gait aid to reduce the load.
What are the 3 topics to cover in pre- and post-surgical education for hip replacement?
- Weight bearing precautions
- Movement precautions
- Activity restriction
What is the most common approach for hip arthroplasty, and why?
Posterolateral approach
Simplest technique and does not interfere with hip abductors.
What are the disadvantages of anterior approach for hip arthroplasty?
Takes longer
A more complex surgery
A newer approach with less given information
What is the disadvantage of posterolateral approach?
High rate (9.5%) of posterior hip dislocation due to nonadherence to hip precautions
What are the hip precautions for posterolateral approach?
- No hip flexion beyond 90 degrees – No reaching down to the floor or lifting the knee up when sitting
- No internal hip rotation or twisting
- No hip adduction beyond midline – No crossing legs at the knee or ankles, sleep with a pillow between knees
What are the OT roles pre-operatively to hip replacement?
- Educate the client precautions and functional implications
- Take environmental history, home Ax, etc.
- Arrange equipment and/or home care needs
- Discuss hip/knee kit and provide information for purchase
What are the OT roles post-operatively to hip replacement?
- Weight bearing as early as 4 hours post-op, 10 steps or more with a walking aid
- Reinforce precautions
- Foot and ankle exercises every hour
What are the OT roles post-operative day 1 to hip replacement?
- Teach correct transfer techniques
- Confirm home support and equipment
- ADL practice with equipment
- Encourage walking 3-5 times during the day
What are the OT roles post-operative day 2 to hip replacement?
- Ensure independence with self-care, dressing, and transfers
- Ensure maintenance of hip precautions during functional tasks
- Review car transfers
What are the OT roles post-operative day 3 to hip replacement?
- Ensure independence with self-care, dressing, transfers while maintaining precautions
- Discharge from acute care if medically stable
What is the ideal number of post-op days that an individual will need before discharge?
3 days
Describe the correct chair/toilet transfer for an individual with hip precautions?
- Back up until they feel the chair/toilet at the back of their legs.
- Slide operated leg forward.
- Reach back and grasp the armrests for support, as both kneeds bend to sit.
- Reverse to stand.
Describe the correct bed transfer for an individual with hip precautions?
- Sit on the bed as per the chair/toilet transfer method.
- Slide buttocks back as far as possible
- Pivot as they lift their legs up onto the bed.
How high must the bed height be to make bed transfers safe for individuals with hip precautions?
At or slightly above knee level.
What are some assistive equipment that an individual with hip precautions may need to transfer onto a bed?
Abduction wedge between legs to ensure no adduction
Leg lifter to ensure no flexion beyond 90 degrees
Reacher to adjust covers
What types of beds are safe for individuals with hip precautions?
Hard mattresses; No water beds or soft mattresses.
True or False: Shower doors make bathtub transfers easier.
False. Sliding doors make it difficult for swiveling on the stool, so shower curtains are better.
True or False: Individual with hip precautions may reach forward for the faucet once in the bathtub.
False. They need assistance to reach forward to the faucet without breaking their hip precautions.
True or False: Individuals with hip precautions do not often need the back rest for their tub stool.
True. Not having a back rest gives them more space to pivot. Individuals with trunk instability may need back rest.
Which cars should be avoided with hip precautions?
Small cars with low seats
How should the car seat be arranged to be the safest for car transfers for individuals with hip precautions?
In the front passenger seat, with the seat back as far as it can go and the back recliend slightly.
When dressing with hip precautions, the [operated/unaffected] side should be dressed first.
Operated
When dressing with hip precautions, the [operated/unaffected] side should be undressed first.
Unaffected
Can individuals with hip precautions return to driving?
Yes, when cleared by the surgeon.
When is it usually safe for individuals with hip replacement to return to sexual activities?
4-6 weeks post-op, depending on healing and pain, with all hip precautions
What is slipped capital femoral epiphysis?
When the capital femoral epiphysis slips off the femoral neck as a result of shearing failure of the cartilaginous growth plate in the proximal femur, i.e. growth plate fracture.
Which conditions usually cause slipped capital femoral epiphysis?
Growth spurt – Weakening of the growth plate
Increased body weight
Which population experiences slipped capital femoral epiphysis the most?
Boys 10-16 years old
Slipped capital femoral epiphysis is usually [unilateral/bilateral.]
Unilateral, but can be bilateral
What is the treatment for slipped capital femoral epiphysis?
Surgical treatment required – Pins through the neck of the femur into the femoral head
What kinds of precautions are needed for slipped capital femoral epiphysis post-op?
No hip precautions necessary.
Need home ADL equipments (i.e. hip kit – raised toilet seats, transfer benches, etc.)
What are the movement precautions for knee replacement?
- No twisting the knee, kneeling, or squatting
2. Keep toes pointing the same direction as their nose – Sleep with pillow between kneeds, no pivoting to turn