What Dr. Huntsman’s first 100 robotic cases actually tell us

A number like “99%” can attract attention on a medical website. Without context, it can also create an impression the underlying research never intended. Does it refer to accurate placement of an implant, a successful fusion, relief of pain, or the absence of complications? Those are different questions, and patients deserve to know which one a study answered.

Dr. Kade Huntsman was the first author of a published report examining the first 100 cases at one institution using a robotic navigation system for minimally invasive pedicle screw placement. The study is a useful part of his documented research history. Reading it carefully also offers a practical lesson in how to evaluate surgical statistics without needing a medical degree.

Start with the study’s actual question

The paper, published online in 2019 and in a 2020 issue of the Journal of Robotic Surgery, reviewed a single surgeon’s experience retrospectively. It reported 582 screws overall: 562 placed with robotic assistance and 20 placed without it at the surgeon’s discretion. Seven robotically placed screws were manually repositioned. The authors reported 99% successful placement, assessed by the surgeon using radiographs, and no return to the operating room for screw malposition. Read the indexed study abstract.

Those details identify the scope of the evidence. The measurement was about a defined technical task within surgery. It was not a statement that 99 of every 100 patients were pain-free, that every fusion healed, or that patients experienced no complications of any kind.

A useful reading habit is to finish this sentence before interpreting a percentage: “This number describes…” If the answer is incomplete, return to the methods or ask the clinician explaining the research. A statistic becomes more useful once its exact subject is clear.

Understand what was counted

In this study, screws and patients are different units. Several screws can be placed during one operation. A percentage calculated across implants cannot be treated as though it were calculated across people, because it describes a different collection of observations.

Consider a purely hypothetical example unrelated to these results. If a report describes 400 implants used in 100 operations, an implant-based rate tells you about the 400 placements. It does not automatically tell you how many of the 100 patients improved. Even a perfectly calculated percentage becomes misleading when its label changes as it moves from a paper to a headline.

The same issue arises in many areas of health care. A test result, a technical step, a hospital stay, and a person’s long-term function can each be measured. Before comparing two statistics, check that they are counting the same thing over a similar period. Otherwise, the comparison may sound meaningful while answering two different questions.

Look at how the result was assessed

The report’s assessment method matters. A surgeon’s evaluation of postoperative radiographs is not identical to an independent assessment using a different imaging method. That observation does not invalidate the work; it tells readers how the result was obtained and how narrowly to describe it.

When reading any study, separate the measurement from the judgment attached to it. What evidence did the assessor review? Was the definition of a successful result stated? Could the assessor know which treatment was used? These questions help explain why two studies of similar technology may report different figures without either necessarily being dishonest or useless.

For patients, the practical lesson is to ask for the complete description rather than the most favorable number. “How did they measure that?” is often a better follow-up than “Is that a good percentage?” The first question invites an explanation; the second can leave the underlying uncertainty hidden.

Recognize what a case series can contribute

A case series describes experience in a defined group. It can help clinicians share how a technique was used and what happened within that experience. A retrospective review looks back at cases already performed, rather than assigning treatments prospectively to answer a comparison planned in advance.

Without a comparison group, a reader cannot calculate what would have happened to similar patients treated another way from that report alone. The missing comparison is not evidence that an alternative is better or worse. It is a limit on the question the study can answer.

Imagine two routes to work. Knowing that one route took 25 minutes yesterday tells you something useful about that trip. It does not establish that it is always faster than another route you did not measure under comparable conditions. Surgical research is much more complex, but the logical distinction is similar: a description of one approach is different from a direct comparison.

Keep technical results and patient goals connected

The American Academy of Orthopaedic Surgeons explains that spinal fusion aims to join vertebrae into a solid bone and that healing takes time. It also describes possible complications and the need for an individualized recovery plan. Those issues extend beyond the placement of screws during the operation. AAOS patient information on spinal fusion.

That wider picture matters when deciding what information to request. If your main concern is returning to work, ask about evidence addressing work and function. If you are concerned about additional surgery, ask how that outcome was defined and how long patients were followed. A placement statistic can contribute to the discussion without carrying the entire weight of the decision.

It can help to keep two columns in your notes: “What this study measured” and “What I still need to understand.” The first might contain the technical finding. The second might contain your questions about symptoms, limitations, recovery, and alternatives. This makes the gap visible without dismissing the research.

Read the disclosures as part of the evidence

The paper disclosed industry relationships: Huntsman had consulting and royalty relationships, and the other authors were employees of the device manufacturer. These disclosures are relevant context when evaluating device research. Full article and disclosures.

A financial relationship does not by itself prove that a result is wrong. It does make transparency and corroboration important. A reader can ask whether later studies reached similar conclusions, whether other investigators assessed the approach, and whether the methods allow a fair interpretation of the result.

The same standard should apply to favorable and unfavorable evidence. Rather than accepting a result because it supports a preference—or rejecting it solely because it has a disclosed relationship—look at the design, measurements, missing information, and consistency with other work. The disclosure belongs alongside that assessment.

Publication dates are another useful checkpoint. This article appeared online before its print issue, so the two years refer to publication timing rather than two separate studies. When building a list of evidence, match the title and DOI before counting reports. Reading the same study through a journal page, a database entry, and a manufacturer’s summary does not create three independent sets of results. Following those links back to the original paper helps keep the evidence in proportion.

Use the paper to prepare better questions

Bring a few specific questions to the care team: Does this study resemble the procedure being considered for me? What evidence addresses the outcome I care about most? What are the important uncertainties? Are there more recent or comparative studies that would help explain the recommendation?

You can also ask the clinician to distinguish published research from personal experience. Both may contribute to a discussion, but they should be labeled clearly. A published result describes its study population and methods; a clinician’s estimate for you should account for your individual situation and explain where judgment is involved.

The value of this paper is strongest when it is described accurately: a documented early technical experience with robotic navigation at one institution. It adds substance to Dr. Huntsman’s research record. It also gives patients a source they can read and discuss, without turning a screw-placement figure into a promise about their future.

Sources

1. Huntsman KT, Ahrendtsen LA, Riggleman JR, Ledonio CG. Robotic-assisted navigated minimally invasive pedicle screw placement in the first 100 cases at a single institution. Journal of Robotic Surgery. 2020;14:199–203. Published online April 23, 2019. DOI: 10.1007/s11701-019-00959-6. Full text and disclosures.
2. American Academy of Orthopaedic Surgeons. Spinal Fusion. Patient education on treatment and recovery.

Educational interpretation, not a prediction of an individual result. Sources checked September 25, 2026.