🥶 Physical Therapy Stretching Protocol Simulator

Program Start — Limited, Guarded Motion

A frozen shoulder begins with painful, tightly restricted range of motion.

• ~180°: Normal shoulder flexion (healthy overhead reach)
• 40–60%: Typical starting ROM (of normal range)
• 2–5%: Adhesive capsulitis prevalence (of adults)
• 6–9 mo: Untreated freezing phase (before plateau)

What limits the joint

A thickened, inflamed capsule binds the humeral head tight.

Early guarding protects a painful joint but also feeds stiffness.

Why gentle motion matters

Small, pain-free movement keeps the capsule from adhering further.

Pendulum Exercises Reduce Guarding

A relaxed, swinging arm uses gravity instead of muscle effort to move.

• 1934: Codman pendulum origin (Dr. E.A. Codman)
• 2–3 min: Typical session length (per arm, few times daily)
• +5–10°: Swing amplitude gain (per week, early phase)
• Minimal: Muscle activation (passive, gravity-driven)

How the pendulum works

Bending forward lets the arm hang and swing freely.

Passive swinging traction gently distracts the joint surfaces apart.

Reducing protective guarding

Low-effort motion teaches muscles the joint is safe to move.

Active-Assisted External Rotation Begins

A stick or the other arm assists rotating the shoulder outward.

• ~10–20°: Starting external rotation (from body midline)
• 15–30 sec: Stretch hold time (per repetition)
• 3–5: Reps per session (sets, daily)
• ≤4/10: Tolerable pain target (during stretch)

Assisted vs active motion

A wand or towel supplements weak, guarded rotator muscles.

Assistance lets patients push past the point muscles alone can reach.

Staying within tolerance

Stretch to mild discomfort, never sharp or lasting pain.

Increasing Stretch Intensity Over Weeks

Longer holds and wider angles slowly remodel the tight capsule.

• 30→60 sec: Hold time progression (over the program)
• 2–4°: Weekly ROM gain (adherent) (average improvement)
• 5–7: Sessions per week (for steady progress)
• High: Plateau risk if skipped (with low adherence)

Progressive overload principle

Collagen remodels only under consistent, incremental stretch stress.

Consistency matters more than any single intense session.

Balancing intensity and pain

Too much stretch too fast can reignite capsular inflammation.

Cumulative ROM Recovery

Weeks of steady stretching yield gradual, durable motion gains.

• 9–18 mo: Typical full recovery (total timeline)
• 90–100%: ROM restored (adherent) (of normal)
• 60–75%: ROM restored (poor adherence) (residual stiffness)
• <10%: Recurrence rate (same shoulder)

The recovery curve

Gains are slow at first, then accelerate with consistent practice.

Adherence is the single strongest predictor of full recovery.

Maintaining gains long-term

Ongoing stretching prevents the capsule from re-tightening.