Bone-preserving adjustable hip replacement illustration

    Bone-preserving adjustable hip replacement

    The problem the invention solves

    Conventional total hip arthroplasty can require removal of large amounts of natural bone (often the femoral neck) and can be difficult to implant with proper alignment. Conventional systems also require many different components and are difficult to adjust to fit the patient in situ.

    The core features of the invention

    A medullary nail is inserted into the femoral canal and includes a neck opening with a central axis at a 110° to 140° neck angle relative to the nail axis. A neck beam with a femoral-head seat is supported in the neck opening and can be longitudinally displaced at the neck angle. A locking assembly engages the nail and an engagement structure on the neck beam to fix the neck beam's longitudinal position, and a femoral head engages the seat.

    The inventive step (what's new or unique)

    The claimed configuration combines (i) an intramedullary nail with a defined-angle neck opening and (ii) a longitudinally displaceable neck beam with tool engagement structures at both ends, plus (iii) a locking assembly that locks the beam position by engaging both the nail and the beam's engagement structure.

    The tangible benefits

    The description states the system provides significant adjustability and retains maximum bone for the possibility of revision. It is intended to allow minimal bone resection and preserve a maximum portion of the femoral neck and proximal femur bone stock. The system is also described as enabling intraoperative alignment and adjustment, including final adjustment of neck length in situ.

    The broader impact (society, sustainability, industry)

    The description indicates preserved natural bone provides a platform permitting future revision surgeries and that the system facilitates later revision without bone resection greater than presently required for current total hip arthroplasty systems.

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