What is the optimal treatment for an intertrochanteric femur fracture in a patient with an ipsilateral below‑knee amputation?

Optimal Treatment for Intertrochanteric Hip Fracture with Ipsilateral Below-Knee Amputation

Use a cephalomedullary nail for fixation, applying traction through an inverted boot technique or skeletal traction pin to achieve adequate reduction on a fracture table. This approach allows standard surgical management while overcoming the unique positioning challenges posed by the amputation.

Surgical Approach

Implant Selection

For intertrochanteric fractures in patients with ipsilateral below-knee amputation, follow standard AAOS guidelines for implant selection based on fracture stability 1:

• Stable intertrochanteric fractures: Either sliding hip screw or cephalomedullary device (strong recommendation)
• Unstable, comminuted, or reverse obliquity patterns: Cephalomedullary nail is mandatory (strong recommendation)

The presence of an amputation does not change implant selection—it only affects positioning technique. The case literature consistently demonstrates successful outcomes with cephalomedullary nailing in this population 2, 3, 4, 5, 6.

Critical Technical Challenge: Traction Application

The primary surgical dilemma is achieving adequate traction and rotational control on a fracture table without a foot to secure in the standard boot. Three validated techniques exist, listed in order of preference:

1. Inverted Boot Technique (First-Line Method)

• Reverse the traction boot 180 degrees on the fracture table
• Apply the boot to the residual limb stump with the heel portion facing proximally
• This allows standard traction application through the tibial stump 2, 3, 6
• Limitation: Requires adequate stump length and at least 90 degrees of knee flexion 5

2. Skeletal Traction Pin (When Inverted Boot Fails)

• Place a 5-mm distal femoral traction pin through the residual limb under fluoroscopy
• Secure the pin to the traction boot mechanism
• Provides superior control of length and rotation compared to skin traction 7
• Critical caveat: Pin must be placed carefully to avoid neurovascular injury and positioned distal enough to avoid interference with the nail tip 7

3. Skin Traction Bands (Adjunctive)

• Apply circumferential skin traction bands around the stump
• Useful as supplementary control but insufficient as sole traction method 4, 6

Surgical Execution

Proceed with standard cephalomedullary nailing technique once adequate traction is established 1, 8:

1. Position patient on fracture table using one of the above traction methods
2. Achieve closed reduction under biplanar fluoroscopy
3. Insert appropriate length cephalomedullary nail (long nail for unstable patterns per AAOS guidelines)
4. Verify reduction quality meets Schipper criteria (anatomic or acceptable reduction) 9
5. Confirm implant position in Cleveland-Bosworth quadrants 9

Perioperative Management

Timing and Anesthesia

• Operate within 24-48 hours of admission (moderate recommendation) 1
• Either spinal or general anesthesia is appropriate (strong recommendation) 1
• Administer preoperative nerve block as part of multimodal analgesia (strong recommendation) 1, 8

Adjunctive Measures

• Tranexamic acid administration to reduce blood loss (strong recommendation) 1
• No preoperative traction (strong recommendation) 1
• VTE prophylaxis with enoxaparin or sequential compression devices (strong recommendation) 8

Weight-Bearing

Allow immediate full weight-bearing as tolerated postoperatively 8. The amputation does not alter this recommendation—patients can mobilize with their prosthesis immediately.

Critical Pitfalls to Avoid

1. Inadequate traction leading to malreduction: The inverted boot or skeletal pin must provide sufficient longitudinal traction. Test reduction quality fluoroscopically before proceeding with nail insertion 2, 6.

2. Neurovascular injury from skeletal pin: When using distal femoral traction pins, place under direct fluoroscopic guidance and ensure adequate distance from the popliteal vessels 7.

3. Skin breakdown from excessive traction: Amputee stumps have altered soft tissue coverage. Monitor skin integrity throughout the procedure 5, 10.

4. Assuming arthroplasty is needed: Unless the fracture is a displaced femoral neck fracture (where arthroplasty would be indicated per AAOS guidelines), the amputation itself is not an indication for arthroplasty over fixation 1.

Expected Outcomes

The literature demonstrates that with proper technique, patients with below-knee amputations achieve:

• Fracture union within 6 months 6
• Return to pre-injury mobility with prosthesis within days to weeks 2, 6
• No increased complication rates compared to standard intertrochanteric fracture fixation 9

The key to success is meticulous attention to the positioning technique—once adequate traction is established, proceed with standard surgical principles for intertrochanteric fracture management.