Total Hip Replacement (THR)

[БЪЛГАРСКА ВЕРСИЯ]

This is a story of male mixed breed rescued dog named Vini. He suffered from a chronic traumatic dislocation of the left hip joint for a long time which resulted in poor function and significant muscle atrophy of the limb. We performed a total hip replacement as this will restore most fully his left hip joint function and early weight bearing after surgery.

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Phase of the surgery of total hip replacement

The surgery consists of placing implants from modular system made of different type metals, metal alloys and polyethylene plastic which replace the affected joint surfaces and provide normal joint range of motion. Size of the implants differs depending on animal’s size and anatomical features.

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Preoperative planning is a key element in determining the proper size of the implants

Two main artificial hip systems exist in the market – cemented and none cemented. In the first system, the implants are fixed to the prepared bone surface using dedicated bone cement. In none cemented systems the joint surfaces are prepared and the implants are inserted in a press fit fashion or by screwing in the bone. The bone grows in to the rough surface of the implants. None cemented systems are stable for longer time and are considered to be a gold standard in total hip replacement in young animals as was the case with Vini.

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Helica modular hip system which was used in Vini’s syrgery

Our expectation is that Vini will be able to restore the normal hip joint range of motion, despite the chronic nature of his hip luxation and the fact that some muscle groups has changed and become fibrotic.

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Vini’s radiographic finding showing a chronic hip dislocation and severe changes in the joint surfaces

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Post operative radiography of Vini’s new hip joint

 

Ten days after surgery Vini is bearing weight with his limb. Reduced hip extension still exists because of muscle contracture. This will hopefully resolve with time and physical therapy.