Acta Orthop. 2015 Jun;86(3):339-44. doi: 10.3109/17453674.2014.1001970.

Good sensitivity and specificity of ultrasound for detecting pseudotumors in 83 failed metal-on-metal hip replacements.

Lainiala O, Elo P, Reito A, Pajamäki J, Puolakka T, Eskelinen A.

BACKGROUND AND PURPOSE: Ultrasound is used for imaging of pseudotumors associated with metal-on-metal (MoM) hips. Ultrasound has been compared with magnetic resonance imaging, but to date there have been no studies comparing ultrasound findings and revision findings.

METHODS: We evaluated the sensitivity and specificity of preoperative ultrasound for detecting pseudotumors in 82 patients with MoM hip replacement (82 hips). Ultrasound examinations were performed by 1 of 3 musculoskeletal radiologists, and pseudotumors seen by ultrasound were retrospectively classified as fluid-filled, mixed-type, or solid. Findings at revision surgery were retrieved from surgical notes and graded according to the same system as used for ultrasound findings.

RESULTS: Ultrasound had a sensitivity of 83% (95% CI: 63-93) and a specificity of 92% (CI: 82-96) for detecting trochanteric region pseudotumors, and a sensitivity of 79% (CI: 62-89) and a specificity of 94% (CI: 83-98) for detecting iliopsoas-region pseudotumors. Type misclassification of pseudotumors found at revision occurred in 8 of 23 hips in the trochanteric region and in 19 of 33 hips in the iliopsoas region.

INTERPRETATION: Despite the discrepancy in type classification between ultrasound and revision findings, the presence of pseudotumors was predicted well with ultrasound in our cohort of failed MoM hip replacements.

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