DeBaun et al reported an anatomic classification for heterotopic ossification (HO) about the hip. Heterotopic ossification can be painful and debilitating. The authors are from Stanford University Medical Center.
Causes of heterotopic ossification about the hip may include:
(1) acetabular fracture ORIF
(2) total hip arthroplasty
(3) severe burns
(4) CNS injuries
The anatomic classification requires a CT scan of the affected hip, which can be used to generate a three-dimensional reconstruction of the deposits.
Anatomic Location
Muscles Involved
anterior
abdominal oblique muscles; iliopsoas; sartorius; tensor fasciae latae; both heads of the rectus; vastus
posterior
gluteus maximus; gluteus medius; gluteus minimus; short external rotators; hamstrings
medial
adductor compartment of the hip
The location of heterotopic calcifications can help in preoperative planning.
Surgical Approach
Type
anterior approach
1
posterior approach
2
medial approach
3
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