Reported Reactions

Devices › Screw, fixation, bone

Device brand name · Screw fixation bone

Unk - Screws: medical device reports filed with FDA

256 reports name it, 2019–2021. Manufacturer given most often on reports: Oberdorf Synthes Produktions. Product code HWC.

256
device reports naming the brand
0% of all MAUDE reports · about 35 a year
0
reports, 12 months to August 2026
0 in the 12 months before
7.8%
classified as malfunction
30.8% across the product code
0%
classified as death, as reported
0 reports · not verified by FDA

FDA's MAUDE database holds 256 reports that name the brand "Unk - Screws" (screw fixation bone), received between March 2019 and June 2021; the manufacturer given most often on reports is Oberdorf Synthes Produktions. Spellings of one product vary from report to report.

0 reports arrived in the 12 months to August 2026, and none in the 12 months before. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases. The event types recorded are injury (92.2%) and malfunction (7.8%); across all screw, fixation, bone reports (product code HWC) death is recorded in 0.1% and malfunction in 30.8%. Event type is the reporter's classification of the report, not a verified outcome.

The device problems coded most often are migration (13.3%), break (8.6%) and unintended movement (6.6%). The patient problems coded most often are pain, dysphagia/ odynophagia and nonunion/delayed-union bone fracture. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."

Reports by month, five years

No report naming Unk - Screws was received in the five years to August 2026; the latest was received in June 2021.

By year received

0811622019: 16220192020: 7520202021: 192021

Event type and report source

Event type, as classified on the report

Death0%0
Injury92.2%236
Malfunction7.8%20
Other0%0
Not given0%0

Who filed the report

Manufacturer report100%256
Voluntary report0%0
User facility report0%0
Distributor report0%0
Not given0%0

Grey bar: all 58,946 reports carrying product code HWC. Event type is the filer's classification and is not verified by FDA.

Device problems coded

Device problem (FDA code)ReportsShareShare across product code
Migrationthe device moved from where it was placed3413.3%4.4%
Breakthe device broke228.6%26.4%
Unintended movement176.6%0.9%
Mechanical problema mechanical problem124.7%0.3%
Device-device incompatibility93.5%4.1%
Patient device interaction problem72.7%0.7%
Loose or intermittent connection62.3%0.6%
Material integrity problema problem with the device material52%0.2%
Device slipped41.6%1.9%
Compatibility problem31.2%0.1%
Material twisted/bent20.8%1.4%
Naturally worn20.8%0.1%
Device contamination with body fluid10.4%0%
Loosening of implant not related to bone-ingrowth10.4%0.6%
Migration or expulsion of device10.4%2.1%

FDA's device problem codes as entered on the report; one report can carry several. Generic codes such as "no apparent adverse event" are left out.

Patient problems coded

Patient problem (FDA code)ReportsShare
Painpain, site not specified4015.6%
Dysphagia/ odynophagia3915.2%
Nonunion/delayed-union bone fracture2810.9%
Failure of implant207.8%
Bone fracture(s)166.3%
Nerve damage124.7%
Injurya physical injury114.3%
Hematomaa collection of blood under the skin or in tissue83.1%
Appropriate clinical signs, symptoms and conditions term/code not available62.3%
Cerebrospinal fluid leakage62.3%
Fistula62.3%
Neurological deficit/dysfunction52%
Paralysis52%
Calcium deposits/calcification41.6%
Loss of range of motion41.6%

Patient problem codes are present mainly in reports filed since 2019 and are often blank.

In context

MeasureUnk - ScrewsProduct code HWCAll MAUDE reports
Reports25658,94626,136,888
Share of that pool—0.4%0%
Classified as death, per 1,000 reports019
Classified as injury92.2%67.2%36.2%
Classified as malfunction7.8%30.8%62.3%
Filed by the manufacturer100%97.3%94.9%

Shares are of reports, not of devices in use. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."

Other brands with product code HWC

BrandReportsLatest 12 monthsClassified as death
UNK - Screws: Trauma3,5762880%
UNK - Screws: Locking2,331980%
Unk - Screws Cortex889160%
Unknown Screw1,2221560%
Screw64700%
UNK - Screws: Nail Distal Locking444120.2%
Unknown Screws652231.7%
UNK - Screws: CMF4102800%
UNK - Screws: Locking: Trauma276340%
Unk - Screws 3 5 Mm Cortex220330%
Unk - Screws Nail Locking211190%
UNK - Screws: 2.7 mm VA Locking204220%
Unk - Screws Cannulated19090.5%
Locking Screw24130%
Ni32,9391,5871.8%

Ordered by report count for navigation only. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA also states that "common products may have a higher number of adverse events due to the higher total number of people using the product."

Questions about Unk - Screws reports

How many FDA reports name Unk - Screws?

256 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 0 in the latest 12 months.

What kinds of events are reported?

injury (92.2%) and malfunction (7.8%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.

What device problems are coded?

migration (13.3%), break (8.6%), unintended movement (6.6%), mechanical problem (4.7%) and device-device incompatibility (3.5%). These are FDA's device problem codes as entered on the report.

Who files these reports?

manufacturer reports (100%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.

Do these reports show that Unk - Screws was at fault?

No. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA adds that "a causal relationship cannot be established between product and reactions listed in a report."

How do I report a problem with a medical device?

Through FDA MedWatch (Form FDA 3500 for health professionals and consumers), or to the manufacturer. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Device Adverse Event (MAUDE) bulk export released 28 Sep 2026, which holds reports FDA received through 31 Aug 2026. Brand, generic and manufacturer names are as written on the reports; product code names come from FDA's device classification. A report counts here when any device it lists carries this brand name after punctuation and capitalisation are normalised. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.