Each time Stephen Magee, DPT sees a patient, he runs through the same appointment protocols. He checks range of motion, strength and forms a baseline for the functional movement that mirrors the patient's recovery goals. At the end of each appointment he runs the same tests, tracking and documenting the progress.
"I love the saying 'what gets measured gets managed.' Objective data drives what we do," says Magee, who sees roughly forty patients a week in a one-on-one capacity at Peak Performance Physical Therapy. "We want to make sure that what we are doing is actually creating significant changes, and we do that based on objective measurement."
The Blind Spot in an Otherwise Precise Field
Physical therapy is precise in many ways. Range of motion is measured to the degree. Strength is tested and documented. Functional capacity has standardized performance benchmarks.
But body composition, especially lean muscle mass which atrophies fastest after injury or surgery, is largely left to estimation. It's also the number many PTs need more data on, treating it as both a warning signal and a benchmark for how well a patient is truly recovering.
"We use the word 'atrophy' constantly," Magee says. "After a knee replacement or ACL reconstruction, you can see over fifty percent reduction in quad muscle mass in a matter of days. But the best tool most PTs have to track that with is a tape measure around the thigh."
Circumferential measurements don't distinguish between muscle and fat, and there is no way to account for swelling. Using this system, there is no way to reliably compare or track recovery in injured vs. uninjured limbs. While tape measures give PTs a number to document, they don't accurately capture what's changing inside the limb.
"For a long time, that precise data was missing from our progress documentation," he says.
How BIA Fills the Gap
Bioelectrical impedance analysis (BIA) has long been the most accessible and accurate tool for body composition measurement in clinical settings. By passing a small electrical current through the body, we can measure a range of key health and composition metrics. Used alongside existing clinical measures, it adds a layer of insight that range of motion and strength testing alone can't provide.
"BIA is really the only tool I utilize to see somebody's water content, lean muscle mass, fat percent and overall composition," says Magee. "I can really get an understanding of the composition from the person sitting in front of me."
That level of confidence in the data comes down to the device.
After his experience with an unreliable competitor, Magee was introduced to RJL Systems through a patient connection. What drew him in was the research: RJL Systems is the most accurate and trusted BIA on the market,with peer-reviewed validation demonstrating equivalence with DEXA,the gold standard in body composition measurement, at a fraction of the cost and without radiation exposure.
Independent, peer-reviewed studies consistently support RJL Systems’ accuracy and reliability, with a standard error of measurement meaningfully smaller than other devices. Back-to-back tests produced tight, consistent results.
"If you can limit your errors, you can trust your data. When you can trust your data, you can use the scientific method: test, hypothesize, experiment, retest," says Magee.
Segmental BIA Adds Practicality to Measurement in Clinical Settings
In addition to whole-body, the Quantum V offers segmental BIA, which reveals what whole-body BIA misses and is better suited for the PT field. RJL’s segmental BIA isolates 13 body regions providing extremely targeted data for a broader range of clinical applications.
With this technology, clinicians can track recovery by comparing injured vs. uninjured limbs and catch imbalances before they become complications, all through an intuitive interface that integrates seamlessly into their existing workflow. Segmental BIA bridges the gap between what he observes in the clinic and what's actually happening in the body.
BIA gives physical therapists concrete data to validate what they’re doing clinically, and that insight answers questions that other tools cannot.
How BIA Fits Into Day-to-Day Practice
Implementing BIA into his practice has been straightforward, using the device as a meaningful checkpoint as patients move through phases of care. Where his daily pre and post treatment tests capture range of motion and functional performance, body composition data fills in what those measures can't see.
Early in a plan of care, the focus is often pain management and restoring range of motion. Later, when treatment shifts toward rebuilding muscle mass, BIA data tells Magee whether that programming is working and when a patient is ready for the next step. For return-to-sport cases, layering in body composition data gives him more complete, confident criteria for clearing patients to return to activity.
Portability
For PTs who split time across multiple clinic locations, treat athletes at local schools and see patients in their homes, portability matters too. The standing platform BIA devices common in many clinics are fixed to one location and require a patient who can stand. For post-surgical and early-recovery patients, that poses a real accessibility risk.
RJL's devices are fully portable and work with patients in any position, whether standing, seated, or lying down, so no patient is out of reach and no measurement window is missed.
"If the device can't travel with you, then a whole category of patients can never see the benefit," Magee says.
The data also changes what patients understand about their own recovery. When the numbers show muscle returning and tissue quality improving, it reframes the hard days as part of a process that's working.
"The more objective data you have, the better you can show a patient what's actually happening," Magee says. "That matters as much for their mindset as it does for their recovery."
Segmental Body Composition in the Current Economic Landscape for PTs
When it comes to capturing reimbursement, the case for skilled, documented and medically necessary care has to be made with objective evidence. Right now, PTs are routinely influencing body composition, building muscle, reducing atrophy and improving tissue quality, without the tools to document it.
"We have lab science to show how fast atrophy happens after surgery," Magee says. "What we don't have is good data in the other direction: how much muscle has returned, and where? How is that impacting quality of life? That's the gap RJL’s Segmental BIA technology fills."
Without objective body composition data, PTs are left making the case for their work with incomplete evidence. Segmental BIA specifically gives PTs the concrete numbers to show not just that a patient improved functionally, but how their specific limb changed over the course of treatment and a data driven measure of recovery
When body composition data works alongside functional testing, PTs gain access to the full picture, enabling them to make better-informed decisions about patient treatment plans. For a field built on the principle that what gets measured gets managed, body composition data is the missing piece. With RJL Systems, it's finally within reach.
Take Measurements You Can Count On
Contact us today to learn how objective body composition data can change what you know about your patients and how you care for them.
