MAUDE Adverse Event Report: STRYKER GMBH LOCKING SCREW AXSOS 3 TI 4.0MM / L40MM; PLATE, FIXATION, BONE

Catalog Number 661040S

Device Problems Detachment Of Device Component (1104); Device Inoperable (1663)

Patient Problem No Code Available (3191)

Event Date 11/09/2016

Event Type  Injury  

Manufacturer Narrative

Once the investigation has been completed any additional information will be reported in a supplemental report.

Event Description

The upper limb consultant, reported that an axsos iii proximal lateral humeral plate had failed/pulled off from a patient.The patient was revised.It was further reported that he had torque the locking screws and that he did not think the bone was of poor quality.The surgeon was unsure whether the patient had been compliant.

Manufacturer Narrative

The reported event that an axsos 3 proximal humeral plate was pulled off from a patient could be confirmed.Based on the investigation, the root cause was attributed to be patient/user related.The failure was caused by the use of incorrect plate size.The device inspection revealed there are no major damages in the implants returned, although evident signs of usage were noted.Further testing regarding the locking mechanism found that the locking mechanism of both screws and plate is fully functional.A clinical statement was requested for the evaluation of the medical data provided: ¿findings of the x-rays: post-op: the x-rays show orif of a proximal humerus shaft fracture with an axsos proximal lateral humerus plate and one interfragmentary lag screw with correct fragment reduction and correct positioning of the hardware (as far as assessable with only one view).There are four screws in the distal main fragment, but the most proximal of them is positioned inside the fracture zone.There is very poor bone quality (advanced osteoporosis), which is rated as very unusual in a relatively young ((b)(6)) patient.For this constellation, a plate with only three bone screws in the distal main fragment outside the fracture zone is rated as distally too short.Approx.4 months follow up: all distal screws are backed out resulting in a loss of fixation and reduction.There is only very little callus formation, which clearly indicates a delayed union and an imminent non-union without any signs of sufficient bone consolidation after 4 months.Clinical statement: for this kind of periprosthetic fracture internal fixation with an axsos proximal lateral humerus plate (or with a similar anatomically pre-shaped locking plate made by competitors of stryker) is rated as state of the art.Therefore, the indication is estimated as absolutely correct.But, in an obese ((b)(6)) patient with such poor bone quality a plate with minimum 5 ¿ 6 screws in the distal main fragment outside the fracture zone should have been chosen, possibly supported by intramedullary bone cement to achieve reliable grip of the screws.With only three screws and a respective short lever arm in osteoporotic bone structure this kind of implant failure was expectable.Clinical conclusion the given case presents a typical implant failure caused by a distally too short plate in a patient with advanced osteoporosis.¿ in addition to the clinical statements and device inspection it was reported that there was no certainty regarding the patient compliance to the surgeons instructions and if the patient was not complaint this would also contribute to the event.Note, as stated in the ifu (v15013): ¿4 warnings and precautions ¿ implant selection and sizing: the correct selection of the fracture fixation appliance is extremely important.Failure to use the appropriate appliance for the fracture condition may accelerate clinical failure.Failure to use the proper component to maintain adequate blood supply and provide rigid fixation may result in loosening, bending, cracking or fracture of the device and/or bone.The correct implant size for a given patient can be determined by evaluating the patient¿s height, weight, functional demands and anatomy.Every implant must be used in the correct anatomic location, consistent with accepted standards of internal fixation.[.] informing the patient the implantation affects the patient¿s ability to carry loads and her/his mobility and general living circumstances.For this reason, the surgeon must counsel each patient individually on correct behavior and activity after the implantation.The surgeon must warn patient that the device cannot and does not replicate a normal healthy bone, that the device can break or become damaged as a result of strenuous activity, trauma, mal-union or non-union and that the device has a finite expected service life and may need to be removed at some time in the future.[¿] adverse effects in many instances, adverse results may be clinically related rather than device related.The following are the most frequent adverse effects involving the use of internal fracture fixation devices: ¿ conditions attributable to non-union, osteoporosis, osteomalicia, diabetes, inhibited revascularization and poor bone formation can cause loosening, bending, cracking, fracture of the device or premature loss of rigid fixation with the bone.¿ [original statement(s)] a review of the device history for the reported lot did not indicate any abnormalities.No corrective actions are required at this time.A review of the labeling did not indicate any abnormalities.No indications of material, manufacturing or design related problems were found during the investigation.If any further information is provided, the investigation report will be updated.

Event Description

The upper limb consultant, reported that an axsos iii proximal lateral humeral plate had failed/pulled off from a patient.The patient was revised.It was further reported that he had torque the locking screws and that he did not think the bone was of poor quality.The surgeon was unsure whether the patient had been compliant.

• Brand Name: LOCKING SCREW AXSOS 3 TI 4.0MM / L40MM
• Type of Device: PLATE, FIXATION, BONE
• Manufacturer (Section D): STRYKER GMBH; bohnackerweg 1; postfach; selzach 2545 ; CH 2545
• Manufacturer (Section G): STRYKER GMBH; bohnackerweg 1; postfach; selzach 2545 ; CH 2545
• Manufacturer Contact: anna jusinski ; 325 corporate drive; mahwah, NJ 07430 ; 2018315000
• MDR Report Key: 6130551
• MDR Text Key: 60991418
• Report Number: 0008031020-2016-00576
• Device Sequence Number: 1
• Product Code: HRS
• UDI-Device Identifier: 04546540708755
• UDI-Public: (01)04546540708755(17)210131(10)V04916
• Combination Product (y/n): N
• Reporter Country Code: GB
• PMA/PMN Number: K123964
• Number of Events Reported: 1
• Summary Report (Y/N): N
• Report Source: Manufacturer
• Source Type: health professional
• Reporter Occupation: Physician
• Type of Report: Initial,Followup
• Report Date: 01/26/2017

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Date FDA Received: 11/28/2016
• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: Yes
• Device Operator: Lay User/Patient
• Device Expiration Date: 01/31/2021
• Device Catalogue Number: 661040S
• Device Lot Number: V04916
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 11/22/2016
• Is the Reporter a Health Professional?: Yes
• Date Manufacturer Received: 01/09/2017
• Was Device Evaluated by Manufacturer?: Yes
• Date Device Manufactured: 02/23/2016
• Is the Device Single Use?: Yes
• Is This a Reprocessed and Reused Single-Use Device?: No
• Type of Device Usage: Initial
• Patient Sequence Number: 1
• Patient Outcome(s): Required Intervention
• Patient Age: 48 YR
• Patient Weight: 95