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Table 2 Modified McAfee’s grading system for heterotopic ossification

From: Pretic-I was a safe and effective artificial cervical disc prosthesis--a retrospective and comparative study with 5-year follow-up

Grades

Descriptions

Grade 0

No HO present

Grade I

HO detectable in front of the vertebral body, but not in the anatomic interdiscal space

Grade II

HO extending into the disc space; possible affection of the function of the prosthesis

Grade III

Bridging ossifications that still allow movement of the prosthesis

Grade IV

Complete fusion of the treated segment without movement in flexion/extension

  1. HO Heterotopic ossification
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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