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Dorsal approach to P1

Retract the cut tendon and expose the capsule.

Capsulotomy

Retract the cut tendon and expose the capsule. Then with scissors dissect out the sides of the joint capsule and insert small right angle retractors to protect the neurovascular structures on each side of the capsule.
Make a cut ¾ of the perimeter of the capsule. Do not cut the volar plate.