Case Report
Heterotopic Ossification in Vertebral Interlaminar/Interspinous Instrumentation: Report of a Case
Table 1
McAfee’s classification of heterotopic ossification (HO).
| McAfee’s classification | |
| (0) No HO | | (I) Islands of bone not within the margins of the disc and not interfering with motion | | (II) Bone within the margins of the disc but not blocking motion | | (III) Bone within the margins of the disc and interfering with motion of the prosthesis | | (IV) Bony ankylosis | |
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*Adapted from McAfee et al. [39].
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