Regional Interdependence: Why We Look Beyond Where It Hurts

One of the more counterintuitive ideas in musculoskeletal care is that the place that hurts is frequently not the place that caused the problem. A cranky knee may be answering to a hip that does not control rotation well. A stubborn low back may be compensating for a stiff mid-back or a limited ankle. This idea has a name, regional interdependence, and it shapes how we assess and treat at Boreal Spine & Sport. It is worth understanding, because it explains why a good assessment often looks well beyond the sore spot.

What regional interdependence means

Regional interdependence is the principle that seemingly unrelated impairments in one part of the body can contribute to symptoms in another, sometimes distant, region. The term was formalized in the clinical literature by Wainner and colleagues, who described it as a musculoskeletal examination model whose purpose is to identify contributing problems in remote areas that may be feeding the primary complaint.¹ The body is not a collection of independent parts; it is a linked system, and load that is not well managed in one link tends to show up somewhere else along the chain.

A later model by Sueki and colleagues broadened the concept, pointing out that the connections are not only mechanical.² Beyond the obvious biomechanical links, the way regions influence each other also runs through the nervous system and other physiological pathways. A practical consequence of this is that treatment directed at one region can produce changes in another, which is exactly what clinicians observe day to day.²

How assessment follows the kinetic chain

If the driver of a symptom can live a joint or two away, then a thorough assessment cannot stop at the painful area. It has to follow the kinetic chain, the connected sequence of joints and muscles that share load during movement. That is why, when someone comes in with knee pain, we are likely to look at how the hip controls the thigh and how the foot and ankle accept load. When the complaint is low back pain, we are interested in the hips and the mid-back as much as the lumbar spine itself.

Standardized movement screens, such as the SFMA and FMS systems, are useful here precisely because they test the body as a whole rather than examining one joint in isolation. The goal is to find the movement or region that is not doing its share, so that the treatment addresses the cause rather than chasing the symptom. If you are curious how that screening process works in practice, we have written more about the movement screen and what it is looking for.

Concrete examples

The concept is easiest to grasp through cases where the evidence has directly tested a remote treatment:

• The hip driving the knee. Patellofemoral pain, the aching front-of-knee complaint common in runners and active people, is a textbook example. A systematic review and meta-analysis by Nascimento and colleagues found that strengthening the hip and knee together was more effective than strengthening the knee alone for reducing pain and improving activity.³ Treating only the sore knee leaves part of the problem untouched.
• The hip driving the outer knee. In iliotibial band syndrome, weakness of the muscles on the side of the hip lets the knee collapse inward and overloads the outer knee, which is why hip strengthening is central to recovery. We cover this in detail in our article on IT band syndrome in runners.
• The ankle and mid-back influencing the low back. A stiff ankle or a rigid thoracic spine changes how the body moves and can shift extra demand onto the lumbar spine, which then becomes the site of complaint even though it is not the origin.

Why this matters for you

Understanding regional interdependence changes what a good outcome looks like. It explains why rubbing, stretching, or resting only the painful area often brings temporary relief followed by a return of symptoms: the actual driver was never addressed. It also explains why treatment sometimes targets a region that does not hurt at all, which can feel surprising until the logic is clear.

None of this means the painful area is ignored. It means the painful area is understood in context. When symptoms are unclear, or when they keep coming back despite sensible care, widening the lens to the whole chain is often what finally makes sense of the picture.¹

This is also why load management fits neatly alongside the concept. Once the contributing region is identified and strengthened, the job becomes rebuilding capacity sensibly, keeping in mind that there are no bad exercises, only too much too soon. A body that is assessed as a connected system, and then loaded thoughtfully, tends to hold its gains rather than cycle through the same flare-ups.

References

1. Wainner RS, Whitman JM, Cleland JA, Flynn TW. Regional interdependence: a musculoskeletal examination model whose time has come. J Orthop Sports Phys Ther. 2007;37(11):658-660.
2. Sueki DG, Cleland JA, Wainner RS. A regional interdependence model of musculoskeletal dysfunction: research, mechanisms, and clinical implications. J Man Manip Ther. 2013;21(2):90-102.
3. Nascimento LR, Teixeira-Salmela LF, Souza RB, Resende RA. Hip and knee strengthening is more effective than knee strengthening alone for reducing pain and improving activity in individuals with patellofemoral pain: a systematic review with meta-analysis. J Orthop Sports Phys Ther. 2018;48(1):19-31.

Dr. Michael Minenna D.C., B.Sc., SFMA, FMS

Related care at Boreal Spine and Sport: Our approach to back pain · Our chiropractic services in Winnipeg.