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. 2006 Oct 30;10(5):R152. doi: 10.1186/cc5083

Table 1.

Times of appearance of clinical, biochemical, MRI, and x-ray findings suggesting HO

Findings indicating HO Clinical ALP MRI X-rays
Time in days mean ± standard deviation 18.7 ± 6.7 13.6 ± 4.7 20.2 ± 6.6 41.4 ± 8.2

Heterotopic ossification (HO) in the knee joint of 11 intensive care unit patients. Increase of serum levels of alkaline phosphatase (ALP) was the earliest indication of HO. MRI, magnetic resonance imaging.