Noise-Induced Hearing Loss: Should Surgeons Be Wearing Ear Protection During Primary Total Joint Arthroplasty?

Abstract

Background:

The risk of noise-induced hearing loss (NIHL) to orthopedic surgeons due to occupational exposures is unknown. A level of 85 decibels (dB) over an 8-hour time-weighted average (TWA) is considered hazardous.

Question/Purpose:

We sought to identify whether manual and/or robotic arthroplasty procedures increase surgeons’ risk of developing NIHL.

Methods:

At our institution, we prospectively collected intraoperative recordings with a microphone attached to the surgeon during manual total knee arthroplasty (TKA), manual total hip arthroplasty (THA), and robotic-assisted total knee arthroplasty (RTKA). Recordings taken in the operating room without operating room staff present served as baseline controls. The 172 recordings consisted of 46 baseline, 42 THA, 40 TKA, and 44 RTKA recordings. Decibel levels were reported as “maximum dB level” (the highest sound pressure level using an A-weighted dB scale), “LA_eq” (the equivalent continuous sound level), “LC_peak” (the peak sound pressure level using a C-weighted dB scale), and “TWA” (the average dB level projected over an 8-hour period). The percentage of allowable daily noise dose was reported as “dose” and the measured dose projected over 8 hours as “projected dose.”

Results:

The recordings of surgeries had average maximum dB levels ranging from 106.0 to 108.0 dB, all significantly greater than controls. Robotic-assisted total knee arthroplasties had the highest average dose (18.7%) and average projected dose (252.0%).

Conclusions:

Our review of recordings at a single institution found that noise levels of RTKAs surpassed projected doses of 100%. Orthopedic surgeons performing more than 2 RTKAs per day may be at increased risk of NIHL. Further research is needed to assess the effectiveness of measures such as ear protection to minimize surgeons’ exposure.