Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Feb 2018
Predictive factors for metal ion levels in metal-on-metal total hip arthroplasty.
Although metal-on-metal (MoM) total hip arthroplasty (THA) and hip resurfacings (HR) have similar bearing surfaces and comparable wear rates, metal ion levels and risk of failure are higher for MoM-THA. The mechanism behind the increased metal ion levels in large head MoM-THA is not completely understood. The current study aims to identify predictive factors for increased metal ion levels in unilateral and bilateral large head MoM-THA. ⋯ The data of the current study suggest that bilateral MoM-THA, increased patient activity levels and female gender are associated with increased chromium levels. Patients with larger component size, longer follow-up time and bilateral MoM-THAs have an increased cobalt-chromium ratio. These patients might be at increased risk for adverse local soft tissue reactions secondary to corrosion. Continuous close monitoring is recommended and bearing-surface change should be discussed if local tissue reactions occur.
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Arch Orthop Trauma Surg · Feb 2018
Combined CT-based and image-free navigation systems in TKA reduces postoperative outliers of rotational alignment of the tibial component.
Rotational malpositioning of the tibial component can lead to poor functional outcome in TKA. Although various surgical techniques have been proposed, precise rotational placement of the tibial component was difficult to accomplish even with the use of a navigation system. The purpose of this study is to assess whether combined CT-based and image-free navigation systems replicate accurately the rotational alignment of tibial component that was preoperatively planned on CT, compared with the conventional method. ⋯ We concluded that combined CT-based and image-free navigation systems decreased the number of rotational outliers of tibial component, and was helpful for the replication of the accurate rotational alignment of the tibial component that was preoperatively planned.
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Arch Orthop Trauma Surg · Feb 2018
Correction to: Superior biomechanical properties and tying time with the modified Prusik knot and Wittstein suture loop to the Krackow stitch.
Due to an error during the production process, the legend.