Pelvic Avulsion Fracture

synonyms: ischial tuberosity fracture, ischial tuberosity avulsion fracture

Pelvic Avulsion Fracture ICD-10

• S32.311A Displaced avulsion fracture of right ilium, initial encounter for closed fracture
• S32.312A Displaced avulsion fracture of left ilium, initial encounter for closed fracture
• S32.313A Displaced avulsion fracture of unspecified ilium, initial encounter for closed fracture
• S32.314A Nondisplaced avulsion fracture of right ilium, initial encounter for closed fracture
• S32.315A Nondisplaced avulsion fracture of left ilium, initial encounter for closed fracture
• S32.316A Nondisplaced avulsion fracture of unspecified ilium, initial encounter for closed fracture

Pelvic Avulsion Fracture Etiology / Epidemiology / Natural History

• Most commonly occurs at the ischial apophysis where the hamstrings insert.
• Generally occurs in adolescence. Rare otherwise.

Pelvic Avulsion Fracture Anatomy

• Hamstrings = Biceps(long head)[tibial n] and Biceps(short head[peroneal n]), Semitendinosus[tibial n], Semimembranosus[tibial n]. 
• All except short head originate from ischial tuberosity. 
• Separate muscle become distinguishable 5-10cm form tuberosity. 
• Complete avulsions generaly occur at the ishial tuberosity.
• Ischial apophysis is relatively weak in adolescences making ischail apophyseal avulsion fractures more common in adolescences.
• Ischail apophyseal secondary ossification center appears in early puberty and does not fuse until late adolescences. (Gidwani S, BMJ 2004;329:99).

Pelvic Avulsion Fracture Clinical Evaluation

Pelvic Avulsion Fracture Xray / Diagnositc Tests

Pelvic Avulsion Fracture Classification / Treatment

• see Ischial Tuberosity Avulsion Fracture.

Pelvic Avulsion Fracture Associated Injuries / Differential Diagnosis

• Ischial Tuberosity Avulsion Fracture

Pelvic Avulsion Fracture Complications

Pelvic Avulsion Fracture Follow-up Care

Pelvic Avulsion Fracture Review References

• Rossi F, Skeletal Radiology 2001;30:127