management

Tsukayama Classification

Incidence

Timing

Early < 3 - 6 months

- most common

Definition

Benign intramedullary cartilage lesion

Etiology

Cause

Movement of iliopsoas tendon over femoral head / iliofemoral ridge / iliofemoral ligament

Can be seen following THA with cup impingement

Symptoms

Audible or palpable snap in the groin

Hip moves

- from flexed / abducted / externally rotated position

- to extended / internally rotated position

Incidence

10% of the population - usually painless

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

Definition

Insufficiency fracture

- secondary to exceeding fatigue threshold

- usually of second or third MT shaft

Epidemiology

Onset of new and very intense / strenuous physical activity

- i.e. new army recruits / dancers

Women with postmenopausal osteoporosis

Association

Cavus feet

History

Pathology

Children < 6

- entire distal humerus physis is displaced

Xray

Distal physis not ossified < 1 year

- may be a difficult diagnosis