fracture

Definition

 Os peroneum

Location

Sesamoid in peroneus longus

- at level calcaneo-cuboid joint

- articulates with cuboid

Incidence

5 - 30% population

60% bilateral

Anatomy

Posterolateral & Posteromedial tubercles

- separated by sulcus for FHL

- lateral larger than medial 

PL tubercle

- size variable

Epidemiology

< 10% of all talus fractures

Rare and often missed

Types

Definition

Spinous process avulsion

- typically C7

- can be seen in thoracic spine

Mechanism

Spinous process avulsion secondary to ligamentum nuchae

Sudden single overload 

Complications

Subscapularis failure

Rotator cuff failure

Instability

Infection

Periprosthetic fracture

Aseptic loosening

Neurological injury

Incidence

Parada et al. J Should Elbow Surg 2021

- 2224 aTSA complication rate 11%, revision rate 5.6%

Indications

Osteoarthritis

Rheumatoid arthritis

Avascular necrosis

Distal Tibial Fractures

Definition

Metaphyseal

Extra-articular

Intra-articular Extension