MAUDE Adverse Event Report: SMITH & NEPHEW, INC. LGN POROUS CR FEM SZ 7R; PROSTHESIS, KNEE, PATELLO/FEMOROTIBIAL, SEMI-CONSTRAINED, UNCEMENTED, POROUS, CO

Model Number 71423257

Device Problem Loss of Osseointegration (2408)

Patient Problems Failure of Implant (1924); Deformity/ Disfigurement (2360); Osteolysis (2377); Inadequate Osseointegration (2646); Joint Laxity (4526)

Event Date 01/11/2019

Event Type  Injury  

Manufacturer Narrative

Internal complaint reference: (b)(4).

Event Description

It was reported that, after an initial right tka had been performed on (b)(6) 2012 due to degenerative joint disease and genu varum malalignment with mild flexion contracture of the right knee, the patient experienced mechanical loosening of the joint.X-rays showed the tibial component had an augment medial and lateral and an extended stem.Plaintiff underwent a right knee revision surgery on (b)(6) 2019, where non-bone ingrown in femoral component surface was found.The patella component was retained.Patient's current health status is unknown.

Event Description

Bilateral patient.It was reported that, after an initial right tka on (b)(6) 2012, due to severe posttraumatic arthritis.Plaintiff experiences mechanical loosening, x-rays showed the tibial component has an augment medial and lateral and an extended stem.Plaintiff underwent a right revision surgery on (b)(6) 2019, where a gross loosening and subsidence of tibial component into extreme varus and non-bone ingrown in femoral component was found and the patella component was retained.Patient status is unknown.

Manufacturer Narrative

H3, h6: the associated device was returned and evaluated.A visual inspection of the device did not reveal the stated failure mode.A lab analysis of the implants concluded that little to no boney in-growth/on-growth on the porous surface of the retrieved implants could possibly cause the loosening of the implants leading to revision.A review of complaint history for the part number over the past 12 months and for the batch number based on historical data of the device did not reveal similar events for the listed device.The clinical/medical evaluation concluded as such: "in conclusion: based on the documentation provided, the primary porous construct was implanted without tibial baseplate fixation screws and cannot be ruled out as a contributing factor to the reported events.The gii tks porous surgical technique notes that appropriately sized screws are to be used in conjunction with the tibial baseplate and finned fixation peg.It is unknown to what extent the lack of fixation screws in the presence of ¿only fibrous tissue ongrowth¿ after approximately 7 years in-vivo had on the construct and/or the ¿extreme varus¿ subsidence; however, the risk for micromotion and/or macromotion would have been increased.The assessed patient impact includes the modified primary surgical procedure (without screw fixation), inadequate bone-integration/gross loosening, subsidence into extreme varus, ¿metallic staining¿ and the revision with long-stemmed, augmented competitor components.Although it was reported that the revision construct provided excellent stability, the current patient status is unknown.No further medical assessment can be rendered at this time.A review of the manufacturing records did not reveal a manufacturing abnormality that could have caused or contributed to the reported incident.At this time, we do not have reason to suspect that the product failed to meet any product specifications at the time of manufacture.A review of the risk management and information for use files revealed this failure mode was previously identified.The anticipated risk level is still adequate.Assessment of historical escalated cases concluded that there are no prior actions related to this device and failure mode.The primary porous construct being implanted without tibial baseplate fixation screws and improper fixing is the main contributing factor for this adverse event.Based on this investigation, the need for corrective action is not indicated.Should additional information be received, the complaint will be reopened.No further investigation is warranted for this complaint; however, we will continue to monitor future complaints and investigate as necessary.We consider this investigation closed.

• Brand Name: LGN POROUS CR FEM SZ 7R
• Type of Device: PROSTHESIS, KNEE, PATELLO/FEMOROTIBIAL, SEMI-CONSTRAINED, UNCEMENTED, POROUS, CO
• Manufacturer (Section D): SMITH & NEPHEW, INC.; 1450 brooks rd.; memphis TN 38116
• Manufacturer (Section G): SMITH & NEPHEW, INC.; 1450 brooks rd.; memphis TN 38116
• Manufacturer Contact: holly topping ; 7000 west william cannon drive; austin, TX 78735 ; 5123913905
• MDR Report Key: 15123323
• MDR Text Key: 296798009
• Report Number: 1020279-2022-03518
• Device Sequence Number: 1
• Product Code: MBH
• UDI-Device Identifier: 00885556030769
• UDI-Public: 00885556030769
• Combination Product (y/n): N
• Reporter Country Code: US
• PMA/PMN Number: K073325
• Number of Events Reported: 1
• Summary Report (Y/N): N
• Report Source: Manufacturer
• Source Type: Other,Company Representative
• Reporter Occupation: Other
• Type of Report: Initial,Followup,Followup
• Report Date: 01/16/2023

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Date FDA Received: 07/28/2022
• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: Yes
• Device Operator: Health Professional
• Device Expiration Date: 10/19/2019
• Device Model Number: 71423257
• Device Catalogue Number: 71423257
• Device Lot Number: 09GHA0023B
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Is the Reporter a Health Professional?: No
• Date Manufacturer Received: 01/12/2023
• Was Device Evaluated by Manufacturer?: Device Not Returned to Manufacturer
• Date Device Manufactured: 10/12/2009
• 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
• Treatment: PN: (B)(4) / LOT: 09FM11726; PN: (B)(4) / LOT: 11DM15083; PN: (B)(4) / LOT: 11LM03634
• Patient Outcome(s): Hospitalization; Required Intervention
• Patient Age: 72 YR
• Patient Sex: Male