The Joint-by-Joint Approach: Understanding Mobility and Stability

The Human Body: An Owner's Manual | 3-minute read

Your body is made up of more than 300 joints, each with its own unique structure and function. Some are designed to allow large amounts of movement, while others prioritize control and stability.

But here's the interesting part: a problem at one joint can affect how another joint moves.

This is the foundation of the joint-by-joint approach, a concept popularized by physical therapist Gray Cook and strength coach Mike Boyle. It offers a simple framework for understanding how different regions of the body work together to produce efficient movement.

Mobility vs. Stability: What's the Difference?

Before we dive in, let's define two important terms.

Mobility is the ability to move a joint through its available range of motion with control. Think about rotating your hips, reaching overhead, or bending your ankles during a squat.

Stability is the ability to control movement and resist unwanted motion. Think about keeping your knee aligned while running or maintaining control of your spine while lifting something heavy.

Both are essential. The joint-by-joint approach suggests that certain regions of the body tend to prioritize one over the other.

The Alternating Pattern

Starting from the ground up, the body follows a general pattern of alternating mobility and stability requirements.

Joint or Region	Primary Emphasis
Foot	Stability
Ankle	Mobility
Knee	Stability
Hip	Mobility
Lumbar spine (lower back)	Stability
Thoracic spine (mid-back)	Mobility
Scapula (shoulder blade)	Stability
Shoulder	Mobility

This doesn't mean your knees shouldn't move or your hips shouldn't be stable. Every joint needs both qualities. The distinction simply helps identify which function often deserves particular attention.

When One Joint Doesn't Do Its Job

Imagine you're performing a squat.

Your ankles need enough mobility to allow your knees to travel forward as you lower yourself. If your ankles are particularly stiff, your body may compensate by changing the position of your feet, knees, hips, or torso.

The same principle applies to your back.

Your hips are designed to move through relatively large ranges of motion, while your lumbar spine provides an important foundation of control. If your hips lack the movement required for a particular activity, you may compensate by moving differently through your lower back.

The key idea is that the body works as a connected system. Restrictions or poor control in one region can influence movement elsewhere.

However, compensation doesn't automatically mean injury, and pain isn't always caused by a neighboring joint. Human movement is more complex than that.

Why Does This Matter?

The joint-by-joint approach encourages us to look beyond the location of a symptom.

For example, someone experiencing lower back pain might benefit from an evaluation of their hip mobility and core stability, in addition to the lumbar spine itself.

Similarly, a person struggling with shoulder movement may need to address mobility through the thoracic spine or improve control of the shoulder blade.

Rather than treating every painful area in isolation, this approach encourages us to consider how the entire movement system functions.

Putting It Into Practice

You don't need an elaborate exercise routine to apply these principles.

• Move your ankles and hips: Maintain comfortable, functional ranges of motion through activities such as squatting, walking, and mobility exercises.

• Develop strength and control: Resistance training helps your knees, trunk, and shoulders manage the demands of everyday activities.

• Move in different directions: Incorporate bending, reaching, rotating, and other varied movements into your routine.

• Remember that movement is individual: Your anatomy, injury history, and activities all influence what you need.

The Bottom Line

The joint-by-joint approach isn't a rigid set of rules or a foolproof explanation for pain. It's a useful model for understanding how mobility and stability work together.

The real lesson is simple: Your joints don't work independently, and neither should your approach to keeping them healthy.

At PALM Health Center, we use principles of functional anatomy and movement to help patients understand their bodies, address limitations, and improve physical function.

Because taking care of your body becomes a lot easier when you understand how it's supposed to work.