Ortho- lower extremity Flashcards
Anterior Cruciate Ligament Injury- pathophysiology
ACL connects posterior aspect of femoral condyle to anterior aspect of tibia
- controls anterior tibia on femur and rotational stability
Bones twist in opposite directions under full body weight
Anterior Cruciate Ligament Injury- cause
Non-contact deceleration -> valgus twisting
Hyperextension
Marked internal rotation
Pure deceleration
Anterior Cruciate Ligament Injury- epidemiology
F>M
Common - soccer, basketball, football, skiing
Anterior Cruciate Ligament Injury- S/S & PE
S/S:
- pop
- immediate effusion
- Difficulty/Can’t weight bear
- Unstable
Exam:
- Lachmans
- anterior drawer
- Lever sigh
Anterior Cruciate Ligament Injury- diagnosis
MRI w/ out contrast
Anterior Cruciate Ligament Injury- labs & imaging
Xray - NOT diagnostic - will show effusion
Anterior Cruciate Ligament Injury- treatment
Young/active + complete tear - surgery
- autograft - own patellar or hamstring tendon
- allograph - cadaver
Older/sedentary OR partial tear - conservative
- PT to strengthen hamstrings
- bracing
Bracing? - debated - remain weight bearing if possible!!
- to protect other structures - inc risk of 2nd meniscus injury
- acute - knee immobilizer and crutches
- Subacute/chronic - hinged brace
Rice
Pain control
Refer Orther
Posterior Cruciate Ligament Injury- pathophysiology
PCL - strongest ligament in knee
Sprains or partial tears more common
Associated w/ injuries - ACL and MCL tears
Posterior Cruciate Ligament Injury- cause
Blow to knee while flexed
- striking knee against dashboard
- falling on a bent knee
Posterior Cruciate Ligament Injury- S/S & PE
S/S:
- swelling IMMEDIATE and PROFOUND
- Severe pain
- Limited ROM
- instable - unable to move
Posterior Cruciate Ligament Injury- diagnosis
Sag sign - tibia posteriorly set off
Posterior draw test - positive
MRI
Posterior Cruciate Ligament Injury- treatment
Refer Ortho
RICE, pain control, immobilization w/ crutches
Isolated PCL tear - treated non-op w/ PT
W/ other injuries - surgery
Medial Collateral Ligament injury- pathophysiology
Most commonly injured
w/ ACL
Extra-articular - joint effusion LESS COMMON
Medial Collateral Ligament injury- cause
Valgus stress on partially flexed knee
Medial Collateral Ligament injury- S/S & PE
S/S:
- Focal pain over ligament
- Minor swelling
- Limited ROM - improves w/in 2w
Medial Collateral Ligament injury- diagnosis
Valgus stress exam
MRI - doesn’t need to happen acutely
Medial Collateral Ligament injury- treatment
Graduated weight bearing Bracing - minor -hinged - sever -immobilizer PT 6-8 weeks of healing Isolated - Rarely need surgery
Meniscus injuries- pathophysiology
“Shock absorbers”
Very common injury
Acutely or degeneration
Meniscus injuries- cause
Internal rotation of femur on tibia w/ flexion knee
- posterior meniscus b/t femur and tibia
Sudden extension - external rotation
- lateral meniscus
Partial or complete tear
Posterior or anterior horn tear
Longitudinal or bucket handle tear
Meniscus injuries- S/S & PE
S/S: - catching, locking, clicking - Painful walking and squatting - Mild to mod joint swelling - JOINT LINE TENDERNESS - lock in extension - piece of menis obstructing joint Exam - McMurray
Meniscus injuries- diagnosis
MRI w/ out contrast
Meniscus injuries- labs & imaging
Xray - nl, but may show joint space narrowing or effusion
- more helpful if hx or OA
Meniscus injuries- treatment
“Degenerative tears - PT
Acute tears - arthroscopic meniscus repair or debridement “
Knee Dislocation- pathophysiology
Dislocation of tibiofemoral joint of knee
ORTHO EMERGENCY
Many present already reduced!
To dislocate - at least 3, if not 4, major knee ligaments are torn
Anterior - most common
Posterior, lateral, medial
Popliteal artery - partial or complete disruption in 40%
Peroneal nerve - 23% injured
Knee Dislocation- cause
Multi-trauma
High-energy trauma
- Hyperextension - anterior dislocation
- anterior blow - posterior desolation: dashboard
Knee Dislocation- S/S & PE
Gross deformity - if not reduced
LARGE effusion
SIGNIFCANT pain- can’t weight bear
MUST EVAL FOR NEUROVASC
- palpable distal pulses - DOES NOT exclude vascular injury
- MUST DO ABI
- assess sensation and strength
ABI - Systolic BP in LE - ankle - Systolic BP in UP - brachial - >.9 - monitor w/ serial exams -
Knee Dislocation- labs & imaging
Xray - AP and lateral
- obtain even if reduced - tibial plateu fracture
CT arteriogram - GOLD
Arterial duplex US
- both eval popliteal artery
- not always indicated -> if ABI
Knee Dislocation- treatment
IV pain control
Reduce - even if has vascular injury
- then reassess
Post reduction xray
Splint - long leg w/ 20–30-degree flexion
Admit for pain control - serial exams w/ortho consult
Knee Dislocation- prognosis
Require MRI after swelling reduced - will likely need surgery
Complications are frequent
Rarely go back to pre-injury state
Knee Dislocation- complications
Complications - limb ischemia, permanent nerve damage, compartment syndrome, arthrofibrosis (most common)
Knee Bursitis- pathophysiology
Bursa becomes irritated - produced too much fluid
-> swelling and puts pressure on adjacent parts
Pre-patellar - most common
- Housemaid’s knee
Knee Bursitis- S/S & PE
S/S:
- swelling and tenderness over bursa
- become infected -> erythema, warmth
Knee Bursitis- diagnosis
Clinical
Knee Bursitis- treatment
NSAIDs
RICE
No pressure over patella
Refractory - prepatellar bursa injections - corticosteroids
Knee Osteoarthritis- pathophysiology
3x more common than hip
Chronic progressive knee pain
- medial more affected
Knee Osteoarthritis- epidemiology
> 65
Knee Osteoarthritis- S/S & PE
S/S:
- Morning stiffness <30min
- Crepitus
- Mild effusion
- Pain relieved w/ rest
- Severe - Genu Valgum or Genu Varum
Knee Osteoarthritis- diagnosis
Xray - joint space narrowing, osteophytes
Knee Osteoarthritis- treatment
Conservative - weight loss, graded exercise
APAP and NSAIDs
Intra-articular Corticosteroid - short term relief
- doesn’t improve quality of life -> greater cartilage loss
Synvisc - intra-articular viscosupplementionation
- mixed date
Platetet-Rich plasma injections - mixed
Total or partial knee replacement
Patella Subluxation & Dislocation- pathophysiology
Very common
Medial or lateral - more common
Patella Subluxation & Dislocation- cause
Direct blow to side of knee
Patella Subluxation & Dislocation- S/S & PE
Pain, swelling, deformity
Limited ROM - locked in extension
Patella Subluxation & Dislocation- diagnosis
Xray - sunrise view