Devices › Prosthesis, hip, semi-constrained (metal uncemented acetabular component)
Device brand name · Prosthesis hip
M2a 38mm Mod Hd Std Nk: medical device reports filed with FDA
308 reports name it, 2012–2022. Manufacturer given most often on reports: Biomet Orthopedics. Product code KWA.
- 308
- device reports naming the brand
- 0% of all MAUDE reports · about 21 a year
- 0
- reports, 12 months to August 2026
- 0 in the 12 months before
- 0%
- classified as malfunction
- 3.4% across the product code
- 0%
- classified as death, as reported
- 0 reports · not verified by FDA
FDA's MAUDE database holds 308 reports that name the brand "M2a 38mm Mod Hd Std Nk" (prosthesis hip), received between February 2012 and November 2022; the manufacturer given most often on reports is Biomet Orthopedics. 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 (100%); across all prosthesis, hip, semi-constrained (metal uncemented acetabular component) reports (product code KWA) death is recorded in 0.3% and malfunction in 3.4%. Event type is the reporter's classification of the report, not a verified outcome.
The device problems coded most often are insufficient device problem information (37.3%), metal shedding debris (14.9%) and material erosion (10.7%). The patient problems coded most often are pain, toxicity and tissue damage. 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
Reports by the month FDA received them. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases.
By year received
Event type and report source
Event type, as classified on the report
Who filed the report
Grey bar: all 138,213 reports carrying product code KWA. Event type is the filer's classification and is not verified by FDA.
Device problems coded
| Device problem (FDA code) | Reports | Share | Share across product code |
|---|---|---|---|
| Insufficient device problem information | 115 | 37.3% | 52% |
| Metal shedding debris | 46 | 14.9% | 7.6% |
| Material erosion | 33 | 10.7% | 1.3% |
| Device dislodged or dislocated | 17 | 5.5% | 5.2% |
| Device operates differently than expectedthe device behaved unexpectedly | 17 | 5.5% | 1% |
| Loose or intermittent connection | 12 | 3.9% | 1.2% |
| Noise, audible | 12 | 3.9% | 3.2% |
| Corrodedthe device corroded | 11 | 3.6% | 2% |
| Device slipped | 9 | 2.9% | 1.1% |
| Patient-device incompatibilitythe device did not suit the patient | 8 | 2.6% | 0.4% |
| Naturally worn | 7 | 2.3% | 6.7% |
| Mechanical problema mechanical problem | 6 | 1.9% | 0.2% |
| Migration or expulsion of device | 5 | 1.6% | 1% |
| Fracturea broken bone | 4 | 1.3% | 1.3% |
| Malposition of device | 4 | 1.3% | 1.4% |
| Unstable | 3 | 1% | 0.3% |
| Compatibility problem | 2 | 0.6% | 0.1% |
| Material protrusion/extrusion | 2 | 0.6% | 0% |
| Calcified | 1 | 0.3% | 0% |
| Failure to osseointegrate | 1 | 0.3% | 0.1% |
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) | Reports | Share |
|---|---|---|
| Painpain, site not specified | 145 | 47.1% |
| Toxicity | 120 | 39% |
| Tissue damage | 61 | 19.8% |
| Loss of range of motion | 51 | 16.6% |
| Reactiona reaction, type not specified | 48 | 15.6% |
| Inflammationinflammation | 37 | 12% |
| Swellingswelling | 35 | 11.4% |
| Discomfortdiscomfort | 33 | 10.7% |
| Injurya physical injury | 33 | 10.7% |
| Ambulation or postural difficulties | 26 | 8.4% |
| Limited mobility of the implanted joint | 26 | 8.4% |
| Osteolysis | 13 | 4.2% |
| Test result | 12 | 3.9% |
| Necrosisdeath of tissue | 8 | 2.6% |
| Foreign body reaction | 7 | 2.3% |
Patient problem codes are present mainly in reports filed since 2019 and are often blank.
In context
| Measure | M2a 38mm Mod Hd Std Nk | Product code KWA | All MAUDE reports |
|---|---|---|---|
| Reports | 308 | 138,213 | 26,136,888 |
| Share of that pool | — | 0.2% | 0% |
| Classified as death, per 1,000 reports | 0 | 3 | 9 |
| Classified as injury | 100% | 94.3% | 36.2% |
| Classified as malfunction | 0% | 3.4% | 62.3% |
| Filed by the manufacturer | 100% | 99.2% | 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 KWA
| Brand | Reports | Latest 12 months | Classified as death |
|---|---|---|---|
| Pinnacle Mtl Ins Neut36idx52od | 3,720 | 13 | 0.1% |
| Pinnacle Mtl Ins Neut36idx54od | 2,874 | 11 | 0.1% |
| Asr Acetabular Cups 52 | 2,428 | 2 | 0.1% |
| Asr Uni Femoral Impl Size 46 | 2,500 | 2 | 0.1% |
| Asr Acetabular Cups 54 | 2,350 | 0 | 0.4% |
| Asr Uni Femoral Impl Size 47 | 2,423 | 0 | 0.4% |
| Asr Acetabular Cups 56 | 2,206 | 0 | 0.4% |
| Asr Uni Femoral Impl Size 49 | 2,278 | 0 | 0.4% |
| Asr Acetabular Cups 50 | 2,056 | 0 | 0.1% |
| Asr Uni Femoral Impl Size 45 | 2,119 | 0 | 0.1% |
| Pinnacle Mtl Ins Neut36idx50od | 2,066 | 9 | 0% |
| Unknown Hip Acetabular Liners | 4,814 | 260 | 0.2% |
| Durom Acetabular Component | 2,071 | 0 | 0.1% |
| Unknown Hip Acetabular Cup | 3,215 | 106 | 0.4% |
| Unknown Depuy Asr Acetabular Cup | 1,933 | 0 | 0.2% |
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 M2a 38mm Mod Hd Std Nk reports
How many FDA reports name M2a 38mm Mod Hd Std Nk?
308 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 (100%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.
What device problems are coded?
insufficient device problem information (37.3%), metal shedding debris (14.9%), material erosion (10.7%), device dislodged or dislocated (5.5%) and device operates differently than expected (5.5%). 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 M2a 38mm Mod Hd Std Nk 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.