✋ Nighttime Wrist Splint Positioning Simulator

Unsplinted Wrist Flexion During Sleep

Sleeping wrists drift into flexed or extended positions without support.

• 40–60°: Typical flexion (placeholder figure)
• Most: Nights affected (placeholder figure)
• ↓ reduced: Tunnel volume (placeholder figure)
• Late night: Symptom onset (placeholder figure)

Why the wrist flexes unsupported

Placeholder: sleep posture allows unconstrained wrist flexion.

Rising Nocturnal Tunnel Pressure

Flexion angle directly raises pressure inside the carpal tunnel.

• ~20 mmHg: Pressure at 0° (placeholder figure)
• ~110 mmHg: Pressure at 60° (placeholder figure)
• Increases: Nerve compression (placeholder figure)
• ~30 mmHg: Onset threshold (placeholder figure)

Pressure-angle relationship

Placeholder: pressure rises with wrist flexion angle.

Splint Neutral Positioning

A rigid brace mechanically holds the wrist near zero degrees.

• 0–5°: Target angle (placeholder figure)
• High: Brace rigidity (placeholder figure)
• Overnight: Wear window (placeholder figure)
• Nightly: Compliance (placeholder figure)

How the splint restrains motion

Placeholder: splint frame blocks flexion and extension.

Reduced Tunnel Pressure With Splint

Neutral positioning keeps carpal tunnel pressure near baseline.

• ~22 mmHg: Pressure w/ splint (placeholder figure)
• ↓ large: Pressure drop (placeholder figure)
• Preserved: Tunnel volume (placeholder figure)
• Improved: Nerve blood flow (placeholder figure)

Effect of neutral hold on pressure

Placeholder: pressure stays low when angle is constrained.

Decreased Nighttime Paresthesia

Lower sustained pressure reduces numbness and tingling episodes.

• ↓ fewer: Episodes/night (placeholder figure)
• Improved: Sleep quality (placeholder figure)
• 2–6 wks: Weeks to benefit (placeholder figure)
• ~60%: Symptom relief (placeholder figure)

Longer-term symptom trend

Placeholder: paresthesia frequency declines over weeks of use.

Placeholder: consistent nightly splint use compounds relief over time.