PFNA has a wide range of indications and is suitable for all types of intertrochanteric fractures (AO classification A 1, A2, A3) and high subtrochanteric fractures, but not for femoral head and neck fractures.
PFNA is a newly improved PFN system. On the one hand, it inherits the original PFN.
On the other hand, there are innovations in the specific design, which make the fixation more effective and the operation simpler. (1) Compared with PFN, PFNA adopts spiral blade locking technology to replace the traditional two pieces.
The screw is fixed, and the unlocked spiral blade automatically screws into the bone when it is tapped, which plays the role of filling the bone. The blade has a wide surface area and a gradually increasing core diameter (4.5 ~ 9
Mm) to ensure the maximum bone filling pressure and ideal anchoring force, and the filling process can be clearly felt when the blade is driven, even for patients with severe osteoporosis. When the blade is pushed into the lock, the blade cannot rotate,
It is tightly anchored to the bone and is not easy to loosen and withdraw. PFNA relies on a part of spiral blades to achieve anti-rotation and stable support. Its anti-cutting stability is higher than that of the traditional screw system, and its anti-rotation stability and anti-varus deformity ability are higher.
Strong. PFNA's spiral blade technology improves its anchoring force to bones, which is more suitable for patients with osteoporosis and unstable fractures, as well as fractures driven by spiral blades on the lateral femur, which is more beneficial to patients.
Early bearing. (2) Secondly, PFNA only needs a 1 spiral blade, which is suitable for patients with thin femoral neck and simple to operate. (3)PFNA has the following improvements on the main nail: ①
The main nail is designed to be hollow, and only a small incision is needed to successfully complete the follow-up operation after guiding the needle into the medullary cavity. Place the main nail, and the external deviation angle of the main nail is 6 degrees, which is convenient to insert from the top of the greater trochanter and enter the medullary cavity. PFN
The main nail is firm, and the nail point should be positioned accurately. If the nail point is not well positioned, it will often lead to the main nail deviating from the center of the medullary cavity or fracture displacement, making it difficult to insert, which may lead to prolonged operation time and aggravated trauma. So, PFNA fucking.
Simpler, less invasive, in line with the principle of minimally invasive. ② There is only one locking hole at the distal end of ②PFN, which can be locked statically or dynamically. In the case of intertrochanteric fracture of femur, the proximal locking may be broken due to the use of vertical impact locking nails.
It is necessary to use oblique locking nails. If it is a high subtrochanteric fracture, you can choose a dynamic locking nail that hits people vertically. ③
The main nail is designed with a sharp groove as long as possible, which can make the insertion more convenient, avoid local stress concentration and reduce the incidence of broken nail and re-broken nail tail.