Breed: Pomeranian Age: 5 years old Gender: Male Weight: 1.9Kg Extreme patellar grade four dislocation, with a lateral femoral dissection Angle of 107°, tibial torsion of 40°, trochlear groove deformity, and joint torsion, it was decided to undergo trochlear groove replacement surgery + tibial osteotomy and orthopedic correction + femoral osteotomy and orthopedic treatment. During the operation, the BlueSAO press-fit biological pulley groove replacement system (PGR) #1 implant was used for replacement. Internal fixation was carried out using the BlueSAO -mini system bone plate 4mm-L pure titanium locking bone plate and the BlueSAO - PRCL®-5mm+ 4mm pure titanium locking bone plate. The operation was very challenging. It was successfully completed. I resumed normal exercise one week after the operation. I hope you will recover soon! Thank you, President Shao Zhiwei of Wuhan Weiwei Animal Hospital, for sharing the clinical cases of the BlueSAO press-fit biological pulley groove replacement system, TPLO system and PRCL 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