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How to Recognize and Deal with the Risk of DAA THA Operation

Oct. 13, 2020

Trying a new surgical technique will often experience the risk of long operation time and/or high complication rate during the learning process. DAA HTA also has its learning curve. How to recognize and deal with the risks that may be encountered during the operation?

1. Lateral femoral cutaneous nerve palsy

One of the most common complications in DAA THA is postoperative lateral femoral cutaneous nerve (LFCN) paralysis.

The main causes of LFCN paralysis are intraoperative traction caused by excessive traction; intraoperative separation.

DAA THA intraoperative operation attention: The skin incision is located on the outside of the nerve area, above the center of the tensor fascia lata muscle abdominal; always pay attention to the position of the sartorius and rectus femoris, and ensure that the operation is done on the outside of this structure.

2. Bleeding risk

In DAA THA, the most common source of bleeding is the lateral femoral circumflex blood vessels.

Intraoperative attention: These blood vessels are located at the distal end of the exposed area and must be handled before opening the joint capsule. After placing the retractor outside the joint capsule, the fat layer is exposed. Carefully separate this layer. At the distal end of the incision, you can see the vascular network running across the surgical area. Generally speaking, 3 blood vessels will be exposed, but the specific blood vessels and positions vary from person to person. These blood vessels can be ligated, clipped, and electrocoagulation, but it is best to treat them systematically. If these blood vessels still have a lot of bleeding after being clamped, you can look for branches outside. Generally speaking, you can see the ascending vessels that need to be ligated.

THA Instrument

3. Femoral neck osteotomy

In DAA THA, the most common risk of femoral neck osteotomy is too much residual femoral neck, which makes it difficult to expose the acetabulum.

For beginners, femoral neck osteotomy can be performed under fluoroscopy guidance. The osteotomy at the base of the femoral neck is generally at a 45° angle to the femoral shaft.

Remove the "napkin-ring" of the femoral head: do an in situ secondary osteotomies under the head of the femoral head, at the junction of the femoral neck and the femoral head, the middle femoral neck part is taken out together with the joint capsule, and the femoral head is available Screw push or bone prying out.

4. Placement of the acetabular prosthesis

In DAA THA, when the acetabulum is filed and the cup is implanted, the anterior lip of the acetabulum and the transverse ligament of the acetabulum should be exposed directly during the operation and used as a navigation mark to ensure accurate placement of the cup.

5. Expose the femur

Exposing the femur and preparing the medullary cavity is often the most challenging step in DAA surgery, and it is also crucial to avoid femoral complications. Adequate exposure and release are the most important points to avoid risks.

6. Place the prosthesis

The possible risks of prosthesis placement mainly include excessive femur anterior tilt, perforation during reaming, and femoral talar fracture.

Excessive anteversion of the femur can cause postoperative instability. During the operation, a suitable mark or reference should be used to determine the anteversion angle.

The incidence of perforation of the medullary cavity and intraoperative proximal femur fracture in DAA THA is 6.5%. Perforation is generally caused by the reaming direction being not deviated to the outside and/or too inward. You can use perspective to avoid this.

Talar femoral fractures are generally associated with biological fixation. If it happens, the prosthesis should be removed, and the cerclage wire should be used to surround the femur for a week and tighten to prevent the prosthesis from sinking again.

During the DAA THA operation, the stability of the hip joint should be checked. The inspection should be carried out to ensure that the prosthesis is in place, there is no bone impact, and the length of both lower limbs is the same.

The above information is provided by the joint prosthesis supplier.