Classification of Mavrogenis et al for Neurogenic Heterotopic Ossification (HO) of the Hip

 

Patient selection: heterotopic ossification (HO) of the hip due to neurogenic cause

 

Basic features:

(1) neurogenic cause

(2) hip or proximal end of femur

(3) with or without ankylosis

 

Parameters:

(1) location

(2) cause

Cause	Type
anterior	1
posterior	2
anterior and medial	3
circumferential (wraps around)	4

 

 

Cause	Subtype
spinal cord injury	a
brain injury	b

 

where:

• One modification might be to add a “c” subtype for other neurogenic cause

• Another modification might be to designate ankylosis.

 

The final designation is the Type and Subtype.