CT

Definition

Ossification of the posterior longitudinal ligament (OPLL)

Heterotopic ossification of the posterior longitudinal ligament

Epidemiology

2:1 Male:Female

More common in Japanese and East Asian populations

Natural history

Superior articular process fracture

- potentially unstable

Inferior articular process fracture

- thought to be more stable

CT scan

Definition

Indications

Osteoarthritis

Rheumatoid arthritis

Avascular necrosis

Femoral Neck Stress Fractures

Aetiology

Athletes with increase activity / distance

Women with eating disorders /  amenorrhea

Types

Compression / inferior neck

- < 50% protective weight bear

- > 50% emergent ORIF

Tension side / superior neck

- emergent ORIF

Types

1.  Capsular avulsions

2.  Body / Nutcracker fracture

Nutcracker fracture

Epidemiology

- rare

Mechanism

- forced eversion / abduction of forefoot

- cuboid crushed between 4th and 5th MT and calaneum

Pathology

- displaced cuboid fracture with subluxation of tarsus

Definition

Coronal plane fracture of distal femoral condyle

- intra-articular

- often only attachment is posterior capsule

Epidemiology

Rare

Mechanism

Usually a severe valgus trauma

Xray