·Breed: Pomeranian, nickname: Er Gou Age: 1 year old Gender: Female Weight: 8Kg The medial side of the patella in the left hind limb is dislocated. Palpation reveals a distinct bone friction sound between the patella and the pulley. The preoperative assessment showed that the internal rotation of the tibia was less than 20°, and it was decided to perform a biological pulley groove replacement surgery combined with TTTT surgery. Before the operation, precise surgical planning was carried out using the BlueSAO iBlueVet software. As the pulley groove deepening surgery had been performed a year ago, it was found during the operation that the pulley was severely worn. Therefore, the BlueSAO biological pulley groove replacement System (PGR) # 3 implant was used for replacement. The operation was successfully completed. Hope you recover soon! Thank you, Dr. Chi Xinyu from the Animal Hospital of Northeast Agricultural University in Heilongjiang Province, for sharing the clinical case of the BlueSAO biological pulley groove replacement system! The pulley groove replacement surgery will bring a painless joint to patients with patellar dislocation. Doctor Jia Xinsheng's view is that the pulley groove replacement surgery will bring a painless joint to patients with patellar dislocation, and he suggests that the pulley groove replacement surgery be adopted for eligible cases of patellar dislocation. For instance, cases where the pulley groove is flat, deformed, poorly developed, too narrow, or where the veterinarian's assessment of the deepening of the pulley groove fails to yield effective results, etc., all recommend the use of pulley groove replacement