The Glens Veterinary Hospital

False pregnancy, also known as Phantom pregnancy or Pseudo-pregnancy, is a condition of both dogs and cats, whereby the unsterilised female animal (regardless of whether she was mated or not) shows some or all of the typical signs of pregnancy but is not really pregnant. In other words, she shows mammary gland development (with or without milk production) but does not produce any offspring.

Patellar luxation is a condition where the knee cap does not run in its groove but slips off to the side. Luxation is a learned word for “slipping”. It is a condition which is regularly encountered in dogs and more commonly in toy breeds. The condition can be developmental or traumatic in origin.

To understand the condition better, it helps to know what the anatomy of the knee looks like. The patella is commonly known as the knee cap and sits at the bottom of the big muscle group of the upper front part of the hind leg called the quadriceps. The patella makes up the front part of the knee and glides in the middle groove of the big bone of the upper part of the hind leg, the femur. This groove is known as the trochlear groove. The groove looks like a valley with two mountain ridges on either side. The ridges on either side of the groove are known as the trochlear ridges. The ridge on the inner part of the leg is known as the medial trochlear ridge and the one on the outer part is known as the lateral trochlear ridge. The knee cap or patella fits nicely in between these two ridges and glides up and down the groove as the knee bends. The patella is stabilised by the big muscle group to the top of it, the strong ligament to the bottom of it and the ligaments and connective tissue to the sides of it. The patella ligament which sits below the patella, implants onto the front of the top part of the bone underneath the femur, the tibia, also known as the shin bone.