A technology that has been gaining significant traction in orthopedic practice offers a faster and more accurate alternative. In-office needle arthroscopy — sometimes called in-office diagnostic arthroscopy, or IONA — allows orthopedic surgeons to directly visualize the interior of a joint during a routine office visit, using nothing more than local anesthesia and a needle-sized camera.
The leading device in this space is the mi-eye system, now in its third generation, manufactured by Trice Medical. The mi-eye 3 is an FDA-cleared, single-use needlescope measuring just 2.3 millimeters in diameter — roughly the width of a standard blood-draw needle. It integrates a high-resolution image sensor, LED illumination, and a camera into a single handheld instrument, paired with a portable tablet for real-time visualization. The most recent iteration introduced a 25-degree angled lens, a feature long standard in traditional operating-room arthroscopes, which significantly expands the surgeon’s field of view. According to Trice Medical, early data suggests the angled camera can capture over sixteen times more visual information than a zero-degree scope.
The clinical workflow is straightforward. The physician numbs the tissue around the joint with a local anesthetic, inserts the needlescope through a standard portal site, and injects a small amount of saline to distend the joint for visibility. Within seconds, the surgeon can visualize cartilage surfaces, meniscal tissue, ligaments, and other structures directly, capturing both still images and video for the medical record. The entire procedure typically takes only minutes, and patients generally resume normal activity within 24 hours. No general anesthesia is required, no operating room is needed, and no hospital facility fee is generated. Physicians who have integrated the procedure into their practices report that it can be performed the same day as the presenting office visit, often while the patient is still in the exam room.
The clinical evidence supporting needle arthroscopy’s diagnostic performance is compelling. In a prospective, multicenter study comparing the mi-eye device to both MRI and traditional surgical arthroscopy as a reference standard, the needle arthroscope correctly identified all pathologies in over 91% of patients, compared to roughly 61% for MRI. The device proved more sensitive than MRI in detecting meniscal tears — 92.6% versus 77.8% — and substantially more specific, at 100% versus 41.7%. Those specificity numbers are particularly significant in a workers’ compensation context, where a false-positive MRI finding can drive unnecessary surgical authorizations and inflated claim costs.
Published case reports have illustrated the technology’s value in precisely the kind of scenario that frustrates claims professionals. In one well-documented case, a patient with persistent knee pain following an injury had undergone MRI imaging that came back negative. Despite the normal scan, symptoms continued. An in-office needle arthroscopy was performed and immediately identified a tear of the medial meniscus that was subsequently confirmed and repaired during follow-up surgery. The diagnosis was reached in approximately twenty seconds of visualization.
A 2025 review published in the Journal of Arthroscopic Surgery and Sports Medicine examined the expanding clinical applications of IONA across multiple joints — knee, shoulder, ankle, wrist, elbow, and hip — and concluded that it is more accurate than MRI for identifying intra-articular pathologies in many of these settings. Notably, the technology has also extended beyond pure diagnostics: surgeons are now performing minor therapeutic procedures through the same needle-sized portals, including partial meniscectomies using miniaturized instruments, which could further reduce operating-room utilization and associated costs.
The economic case for in-office needle arthroscopy is particularly relevant to the workers’ compensation system. A cost-minimization analysis published in the Journal of Bone and Joint Surgery Open Access evaluated societal costs of using in-office diagnostic arthroscopy compared to MRI for employed patients receiving workers’ compensation or disability benefits. The study, which examined data from four U.S. metropolitan regions, found that in-office arthroscopy produced potential savings of approximately $7,852 to $11,227 per operative patient compared to the MRI pathway. Those savings reflected not only lower direct procedure costs — average commercial reimbursement for in-office knee arthroscopy was approximately $629, compared to over $1,000 for outpatient MRI — but also the substantial indirect costs of delayed diagnosis: lost wages, extended disability payments, additional office visits, and interim treatments that might prove unnecessary once a definitive diagnosis is reached.