We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and7 years after surgery, they showeda breakage of theHAat the head–stemjunction. We analyzed macroscopically and microscopically (by a scanning electron microscopy) the surfaces of the broken prostheses. In both cases, a fracture was detected starting at the joining point between the femoral head and the slot that receives the taper cone of the stem(the so-called bore),with the typicalmacroscopic and microscopic pattern of a fatigue fracture. The fatigue fracture resulted from repeated cycles of torsional stresses throughout the years. In literature, we did not find any other report of such HA failure.
Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties / Dettoni, Federico; Cottino, Umberto; Spriano, Silvia; Bonasia, Davide Edoardo; Rossi, Roberto. - In: JOINTS. - ISSN 2282-4324. - ELETTRONICO. - 5:(2017), pp. 51-56. [10.1055/s-0037-1601407]
Bore Disruption: An Unusual Mechanical Failure of Two Hip Hemiarthroplasties
SPRIANO, SILVIA;
2017
Abstract
We report a case of two hemiarthroplasties (HAs) that underwent an unexpected mechanical failure. Two patients affected by femoral fractures were treated with an HA. At 5 and7 years after surgery, they showeda breakage of theHAat the head–stemjunction. We analyzed macroscopically and microscopically (by a scanning electron microscopy) the surfaces of the broken prostheses. In both cases, a fracture was detected starting at the joining point between the femoral head and the slot that receives the taper cone of the stem(the so-called bore),with the typicalmacroscopic and microscopic pattern of a fatigue fracture. The fatigue fracture resulted from repeated cycles of torsional stresses throughout the years. In literature, we did not find any other report of such HA failure.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2674589
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