Intended for Surgeon

Pelvic reconstruction in a tumor case in a 52-year-old woman: Customized Hip Prosthesis

Product

Orthopedy

Date

Doctor

The patient is a 52-year-old woman who presented to the physician with hip pain. Imaging and biopsy confirmed the diagnosis of a Chondrosarcoma tumor.

The patient’s right hip had a Chondrosarcoma tumor.

Pre-operative simulation and planning

Using MRI imaging, the locations of the cuts on the patient’s bone in the pubis and ischium were identified. The patient’s tumor extended to the SI joint and required reconstruction.

Determining the location of the cuts in the bone

Based on the patient’s contralateral side, the overall geometry of the prosthesis was obtained. The version and inclination angles of the cup were also applied according to the patient’s healthy side.

The positions for 4.5 mm screws at the prosthesis connection to the sacroiliac joint and 3.5 mm screws at the connection to the pubis and ischium were designated for the prosthesis fixation, and holes were made on the prosthesis for muscle attachment. A porous structure was created at the prosthesis-bone interfaces to promote bone tissue formation.

The part was manufactured using a 3D printer and, after post-processing, cleaning, and sterilization with gamma radiation, it was provided to the physician.

Prosthesis with porous structure

Tumor images

The bone was cut using a guide designed based on the patient’s anatomy, and the tumor was removed.

The guide was designed to fit onto the bone.
The tumor was removed from the patient’s pelvis.

Images after surgery

The prosthesis was placed on the pubis, ischium, and sacrum bones according to the planning, and fixation was achieved through the pre-designated screw holes.

The patient’s post-op radiology

Post-operative status

Nine months after the surgery, no signs of recurrence or new involvement were observed in the patient’s PET scan.