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MRI-demonstrated outcome of subchondral stress fractures of the knee after treatment with iloprost or tramadol: observations in 14 patients.

Author(s): Mayerhoefer ME, Kramer J, Breitenseher MJ, Norden C, Vakil-Adli A, Hofmann S, Meizer R, Siedentop H, Landsiedl F, Aigner N

Affiliation(s): Department of Radiology, Medical University of Vienna/Vienna General Hospital, Vienna, Austria. marius.mayerhoefer@meduniwien.ac.at

Publication date & source: 2008-07, Clin J Sport Med., 18(4):358-62.

OBJECTIVE: To investigate the outcome of subchondral stress fractures (SSF) of the knee after treatment with the prostacyclin analogue Iloprost or the opioid analgesic Tramadol. DESIGN: Case series/retrospective review. SETTING: Tertiary care center. PATIENTS: Fourteen patients with at least a single subchondral stress fracture of the knee, surrounded by bone marrow edema, visible on T1-weighted and short tau inversion recovery magnetic resonance images. INTERVENTIONS: Nine patients had been treated with oral Iloprost (group 1; 11 SSF) and 5 patients with Tramadol (group 2; 5 SSF) for 4 weeks in the course of a double-blind, randomized clinical trial. MR images were obtained at baseline (1 day before the start of treatment), after 3 months, and after 1 year. MAIN OUTCOME VARIABLES: SSF volumes and their rates of change between baseline and follow-up examinations, as determined on T1-weighted images by computer-assisted quantification. RESULTS: After three months, the SSF volumes had decreased by a median of 42.2% in group 1 and increased by a median of 2.2% in group 2 (P = 0.008). After 1 year, the median decrease in SSF volumes was 100.0% in group 1 and 65.7% in group 2 (P = 0.017). CONCLUSION: This small case series suggests that healing of SSF is more pronounced after Iloprost treatment.

Page last updated: 2008-08-11

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