Fatigue Fracture in Dual Modular Revision Total Hip Arthroplasty Stems: Failure Analysis and Computed Tomography Diagnostics in Two Cases.

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Fatigue Fracture in Dual Modular Revision Total Hip Arthroplasty Stems: Failure Analysis and Computed Tomography Diagnostics in Two Cases. / Norman, Pontus; Iyengar, Srinivasan; Svensson, Ingrid; Flivik, Gunnar.

In: Journal of Arthroplasty, Vol. 29, No. 4, 2014, p. 850-855.

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TY - JOUR

T1 - Fatigue Fracture in Dual Modular Revision Total Hip Arthroplasty Stems: Failure Analysis and Computed Tomography Diagnostics in Two Cases.

AU - Norman, Pontus

AU - Iyengar, Srinivasan

AU - Svensson, Ingrid

AU - Flivik, Gunnar

PY - 2014

Y1 - 2014

N2 - We report on two patients with fracture of a modular, tapered and distally fixed, uncemented titanium revision hip stem, not previously described. A failure analysis revealed that the cause of the fractures was the development of fatigue cracks in the mid-stem cobalt-chromium modular junction ending in corrosion-fatigue failure. No material defects or stress risers were found in any of the implants. The diameter of the mid-stem modular junction might be undersized for use in heavy and active patients. We also report a new way of detecting an undisplaced fracture at the modular junction, using the scout image from a computed tomography (CT) scan; a technique that can be used when plain radiographs are inconclusive.

AB - We report on two patients with fracture of a modular, tapered and distally fixed, uncemented titanium revision hip stem, not previously described. A failure analysis revealed that the cause of the fractures was the development of fatigue cracks in the mid-stem cobalt-chromium modular junction ending in corrosion-fatigue failure. No material defects or stress risers were found in any of the implants. The diameter of the mid-stem modular junction might be undersized for use in heavy and active patients. We also report a new way of detecting an undisplaced fracture at the modular junction, using the scout image from a computed tomography (CT) scan; a technique that can be used when plain radiographs are inconclusive.

U2 - 10.1016/j.arth.2013.09.008

DO - 10.1016/j.arth.2013.09.008

M3 - Article

VL - 29

SP - 850

EP - 855

JO - Journal of Arthroplasty

JF - Journal of Arthroplasty

SN - 0883-5403

IS - 4

ER -