Breed: American Shorthair mixed with Garfield, sex: female and neutered, weight: 3.9kg, age: 1 year old.

This is a 1-year-old, female, neutered American Shorthair and Garfield mix. She grew up with a difficult fate and started wandering at a very young age. Rescued by her current owner, she was later found to be walking abnormally. She underwent bilateral tibial osteotomy in other hospitals to correct the tibial deformity. However, the walking condition did not improve too well. It was later discovered that the cat had bilateral hip dysplasia, and the owner chose hip replacement surgery to treat the cat. About half a year ago, the cat came to our hospital and we found that in addition to hip dysplasia, the joint had started to have hyperplasia and there were bone spurs on the lateral edge of the acetabular head. However, the acetabulum was only 9mm, and the smallest acetabular prosthesis we had at that time was 12mm, which was too big for the cat to fit. The surgery had to be postponed. I immediately contacted BlueSAO to see if we had a suitable acetabular prosthesis. The cat's hip joint has its own unique characteristics - the acetabulum is small. The distance from the anterior edge to the posterior edge is usually no more than 15mm, mostly between 10-12mm. The femoral bone marrow cavity is large and straight. Therefore, hip replacements in cats usually have a small acetabular cup corresponding to a large femoral stem.

In fact, BlueSAO was already developing a 10mm acetabular prosthesis at that time. It is very easy to produce such a prosthesis, but it cannot be used directly in clinical cases. After material selection, product formation, product quality control, various experiments, and subsequent improvements, etc.. Finally, it will reach our clinicians and be used in clinical cases.

After waiting for more than half a year, we finally got the Nano Bone Cement Hip Replacement System from BlueSAO. The BlueSAO Nano system is a 10mm acetabular cup prosthesis and a 1-3 head stem with an integrated femoral stem. Such a small hip replacement system is very mini and very delicate.

Four preoperative x-rays of the pelvis in frontal and lateral position, and the femur in frontal and lateral position were taken. For patients who need to use the Nano system, the positioning must be standard and the X-ray markers must be placed in the exact position.

Otherwise, the X-ray calibration is not accurate and a difference of 1mm is a big error. This has a great impact on the selection of surgical implants and the surgical planning.