Please confirm topic selection

Are you sure you want to trigger topic in your Anconeus AI algorithm?

Please confirm action

You are done for today with this topic.

Would you like to start learning session with this topic items scheduled for future?

Midfoot Arthritis
Updated: Oct 4 2016

Tarsalmetatarsal Arthrodesis

Preoperative Patient Care
Operative Techniques
E

Preoperative Plan

1

Radiographic templating

  • triplanar radiographs of the foot
  • CT scan
  • determines configuration of the Lisfranc complex

2

Execute surgical walkthrough

  • describe the steps of the procedure verbally to the attending prior to the start of the case
  • describe potential complications and steps to avoid them
F

Room Preparation

1

Surgical instrumentation

  • K wires
  • 3,4 or 5 mm cortical screws
  • plating systems(optional)

2

Room setup and equipment

  • standard OR table
  • bring fluoroscopy from the contralateral side

3

Patient positioning

  • supine position
  • align sole of the foot with the end of the bed
  • place tourniquet around the upper thigh
G

Approach

1

Mark and make incision

  • inflate thigh tourniquet.
  • mark the first incision between the first and second metatarsal to access the first TMT joint and most of the second
  • make a 6 cm incision just lateral to the EHL tendon
  • if needed make the second incision centered around the over the fourth metatarsal

2

Identify neurovascular structures

  • identify and protect the superficial and deep peroneal nerves as well as the dorsalis pedis artery with a retractor
  • the distal 3 cm of the incision should be centered around the TMT joint
  • cauterize the vein that is found crossing the field
H

Joint Preparation

1

Expose the the TMT joint

  • evacuate the hematoma for exposure and visualization

2

Determine the joint instability

  • determine the joints which are involved in the instability pattern by using fluoroscopy
  • stabilize the hindfoot while the forefoot is manipulated with abduction and adduction followed by plantarflexion and dorsiflexion stress
  • when DJD is present there is often significant deformity of the TMT joints with lateral abduction as well as dorsiflexion
  • perform significant soft tissue release around the involved joints to mobilize the joint for reduction in all planes
I

Arthordesis Preparation

1

Debride the joint of all loose pieces of cartilage

  • remove the articular cartilage from the opposing surfaces of the joints using a rongeur, curettes and osteotome
  • the goal is to remove only cartilage and exposed subchondral bone

2

Fully expose joint

  • place a small laminate spreader to allow visualization of the entire joint
  • if the full joint is not exposed there is a tendency to fuse the joint in dorsiflexion

3

Create a vascular channel

  • use a small diameter drill or small osteotomes on the opposing surfaces to create vascular channels

4

Perform reduction

  • secure and reduce the first TMT joint
  • check alignment with fluoroscopy

5

Temporarily place a K wire to stabilize the joint

J

Fixation

1

Stabilize medial column

  • place a 3,4 or 5 mm cortical screw from the medial cuneiform into the first metatarsal
  • this stabilizes the medial column as a foundation for the remaining metatarsals to be secured

2

Reduce the second metatarsal into the keystone position

  • use a clamp to pull the metatarsal base onto the lateral aspect of the first metatarsal and adjacent cuneiform
  • check alignment radiographically

3

Place second cortical screw

  • insert the second screw from the medial cuneiform into the base of the second metatarsal
  • placement of remaining fixation and placement is dependent on the individual situation
  • placement of one more point of fixation is needed
  • the simplest method is to use compression staples
K

Treat Intraoperative and Immediate Postoperative Complications

1

Step 1 in treating intraoperative complications

2

Step 2 in treating intraoperative complications

L

Wound Closure

1

Irrigation, and hemostasis

  • ensure hemostasis using cautery

2

Superficial closure

  • use 3-0 nylon for skin

3

Deep closure

  • use 2-0 vicryl for the subcutaneous layer

4

Dressing and immediate immobilization

  • place in well padded non-weightbearing short leg plaster cast
  • split cast in recovery room to allow for post op swelling
Postoperative Patient Care
Private Note