Collateral Ligaments of the 1st IP

Proximal/Superior Attachment

• Head of Proximal Phalanx of the Thumb - Attached to the Sides

Distal/Inferior Attachment

• Base of Distal Phalanx of the Thumb - Palmar Aspect. Blends with the Lateral Margins of the Palmar Ligament

Joints

• IP of the 1st Phalanx of the Hand