Acute PLC Background
Anatomy

3 primary stabilizers (plus posterolateral capsule)
LCL / Popliteus / Popliteofibular ligament
Laprade et al. AJSM 2003
https://pubmed.ncbi.nlm.nih.gov/14623649/
1. Lateral collateral ligament
Femoral attachment

LCL / Popliteus / Popliteofibular ligament
Laprade et al. AJSM 2003
https://pubmed.ncbi.nlm.nih.gov/14623649/
1. Lateral collateral ligament
Femoral attachment
Most common lower limb neuropathy
Valgus TKR - 3%
HTO - 10%
Direct Trauma / Compression
Knee Dislocation
Tibial fracture
Cast / Dressing
Lateral Meniscus Repair
Severe LBP
- most common indication
Ipsilateral knee pain
- less beneficial
Malposition
- especially abduction
Absent abductor mechanism
Flail
Active infection
Insufficient bone stock
LLD
Any act or failure to act that
- results in or potentially results in harm / death / physical / emotional / sexual abuse
- by a parent or caretaker who is responsible for the child
Neglect
Physical (punch / kick / bite / burn / shake)
Sexual
Emotional
70% male
70% positive FHx
20% learning difficulties
Early / late onset
Unilateral / bilateral
1. Habitual
Toddlers - child can heel walk
2. Structural
Fixed equinus - CTEV / arthrogryposis
Short / tight T Achilles
Space occupying lesion in calf
No good definition
- flexible flat foot
- medial longitudinal arch of foot in weight-bearing is in contact with ground or closer to ground than 'normal'
Common
- almost always bilateral
- strong familial tendency
Physiological
All infants have flat feet
1 year: Bow legs / 15° varus
2 year: Neutral
3 year: Knock knees / 10° valgus

6 year: Physiological valgus / 6° valgus
Splints
Extend elbow to side
- medial wounds
- extension
Flex elbow to side
- flexion range
Flex elbow to front
- olecranon wound
Extend elbow to front
- anterior wounds
- carrying angle
- forearm wasting
Palm up
- clawing
Neck
- ROM
Shoulder
- behind head / to mouth
- to back pocket
Elbows
- flex / extend elbows
- pronation / supination with thumb up & elbows by side
Wrist
- flexion / extension
Hand
- make fist with thumb in and out
Shoes
Walking aids
Front
Knee alignment
- physiological valgus
Patellar rotation
- squinting (inwards, increased PFA)
- grasshopper eyes (high and lateral)
Swelling
Quads Wasting
Scars
