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One indication for patients is an incompetent Achilles tendon. For example, in the case for an untreated Achilles tendon rupture, which doesn’t heal, the FHL tendon will augment the non-functioning Achilles tendon. Another indication is having a weak or potentially weak Achilles tendon. For example, in the case of a Hagland’s Deformity, where the Achilles tendon would need to be detached, cleaned out, and reattached, an FHL transfer may be augmented in order to maximize the strength in that area.
The technique for this procedure involves harvesting the FHL tendon, responsible for flexing the big toe, and transferring it into or around the calcaneous where the Achilles tendon attaches, which can be done in either a two incision technique or one incision technique:
The two incision technique involves making an incision on the inside arch of the foot where the FHL tendon is harvested. A second incision is made in line with the Achilles tendon on the inside aspect of the lower leg where the Achilles tendon is identified, as well as the muscle belly of the FHL. The tendon is then cut closest to the toes and looped through the calcaneous and back onto the Achilles.
The one incision technique involves making an incision in line with the Achilles tendon on the inside aspect of the lower leg where the Achilles tendon is identified, as well as the calcaneous and muscle belly of the FHL. The FHL tendon is followed as far as possible into the foot, which is then cut and fixed to the calcaneous.
0-6 week Post-Surgery
Patients should generally protect the repair for about 6 weeks to let the tendon transfer heal, while being non-weight bearing or limited weight bearing through the heel in a cast or cast boot.
6-10 (or 12) weeks Post-Surgery
Once the repair has adequately healed, the patient can begin moving the foot with minimal resistance and eventually increasing resistance. The patient can begin walking as tolerated in a protective boot, such as a cam walker, and begin physical therapy to work on strength and endurance over the next few months.
10 (or 12) weeks + Post-Surgery
Usually around the 10-12 week mark, the patient can start to transition. About 50-60% of recovery is gained within the first 6 months; however it may not be 15 -18 months for maximal improvement.
Potential General Complications
Potential Specific Complications
- Failure of Graft: The graft may become incompetent or pull out. Potentially, after a successful surgery, the graft may also fail 9 months + post-surgically.
- Wound Healing Problem: Although this is usually a general complication for most procedures, the wound healing complication is particularly concerning for an FHL to Achilles tendon transfer because the Achilles tendon region has relatively little skin coverage making the wound healing problem more susceptible to quickly extend down to the tendon.
- Infection: Similar to a wound healing problem for an FHL to Achilles tendon transfer, an infection is also increased significantly. The source of an infection is usually from the wound healing problem and can be very serious, possibly requiring further surgery.
- Weakness of 1st Metatarsal: Because the FHL is responsible for flexing the big toe, there may be weakness post-surgery. Fortunately, this is not clinically significant.
Edited July 3rd, 2014