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Heterotopic ossification presenting as arthritis.

C C Yue, A Regier, I Kushner

The Journal of Rheumatology

|August 1, 1985

Summary

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Heterotopic ossification can cause arthritis, a condition recently identified. Synovial fluid analysis in affected patients revealed low white blood cell counts but high protein levels, aiding early diagnosis.

Area of Science:

Rheumatology
Orthopedics
Pathology

Background:

Heterotopic ossification (HO) is the abnormal formation of bone in non-skeletal tissues.
HO presenting as arthritis is a recently recognized clinical manifestation.
Early diagnosis of HO is crucial for effective management.

Observation:

Four patients presented with arthritis attributed to heterotopic ossification.
Synovial fluid analysis was performed on affected joints.
Key biochemical parameters were analyzed, including leukocyte count and protein concentration.

Findings:

Synovial fluid leukocyte counts were consistently low across all patients (ranging from 50 to 670 cells/mm³).
Synovial fluid protein concentrations were disproportionately elevated in three out of four patients (2.6–5.3 g/dL).

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The underlying mechanism for elevated synovial protein in HO-associated arthritis remains undetermined.

Implications:

The distinct synovial fluid profile (low leukocytes, high protein) may serve as a diagnostic marker for HO-induced arthritis.
This biochemical signature could facilitate earlier identification of heterotopic ossification.
Further research is warranted to elucidate the pathomechanisms driving these synovial fluid changes.