Admitting Hip Replacements Cause Metallosis, Smith & Nephew Issues Urgent Recall

Smith & Nephew Modular SMF hip implant
Smith & Nephew Modular SMF hip implant

Admitting for the first time that its Modular SMF and Modular REDAPT femoral replacement hip systems cause toxic metallosis in patients, Smith & Nephew has issued an urgent field safety notice recalling thousands of the defective medical devices.

The recall affects 6,266 SMF and REDAPT hip systems in commerce, plus 13,671 modular neck hip prostheses in commerce — shipped from October 2008 through July 2016.

Based in Memphis, TN, Smith & Nephew has sold the Modular SMF and REDAPT implants for almost a decade. In its letter to doctors, the company admitted that “Smith & Nephew considers that patients implanted with the modular neck hip prostheses may be at greater risk of revision surgery than with comparable monolithic products.”

Metal-Related Adverse Events

The letter states, “We observed a rate of complaints higher than comparable monolithic hip prostheses. Metal-related complaints are trending upward year-on-year with an overall complaint rate (number of complaints/total implantations) of 0.527% for Modular SMF and 0.25% for Modular REDAPT Revision Femoral Hip Systems. Overall, the metal-related Adverse Events accounted for the highest category of complaints in both products.

“For patients that exhibit these symptoms, physicians may consider additional clinical follow-up which includes the following:

  • Cobalt/Chromium metal-ion level measurements in whole blood – metal ion levels in excess of 7ppb may indicate the potential for soft tissue reaction; and
  • Where appropriate and subject to the clinician’s assessment, further active evaluation of the potential soft tissue reactions either through ultrasound or cross-sectional imaging might be indicated.”

Hip litigation

In related litigation, plaintiffs who were injured by Smith & Nephew’s Birmingham Hip Resurfacing (“BHR”) system and R3 metal-on-metal liner (“R3”) have filed a motion with the Judicial Panel on Multidistrict Litigation to create new MDL No. 2775 in the US District Court for the District of Maryland.

The plaintiffs allege that the BHR and R3 devices have caused toxic levels of cobalt and chromium in the bodies of patients implanted with the devices, and caused other symptoms including metallosis, pain, adverse local tissue reaction, pseudotumor, bone and tissue necrosis, and other symptoms leading to revision surgery.

Modular femoral stems have been a big problem in orthopedics for years. Stryker Orthopedics had to recall two of its modular stems in 2012 because of very high failure rates. A total of 1,807 cases have been filed in MDL 2441 against Stryker before Sr. US District JudgeDonovan W. Frank in Minnesota.


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