HEMIARTHROPLASTY

         It is the partial joint replacement, replacing only one side of a joint. For example head of the femur is replaced with artificial component and the acetabulum is left as it is.

INDICATION:

•  one half of the joint is affected

EXAMPLE: fracture neck of the femur in the elderly person.

PROSTHESES:

    

         The prosthesis used are 

•  single piece - monopolar.
•  2 piece - bipolar. In bipolar, motion occurs between the two parts of the prosthesis.

         The prosthesis can be cemented or uncemented.

•  cemented - bonded to the host bone by bone cement.
•  uncemented - natural bonding occurs between the host bone and the prosthesis.

OPERATIVE TECHNIQUE:

• exposing the hip
• dislocating the hip
• resecting the ends
• medullary canal for receiving the prosthesis
• implanting the prosthesis
• reducing the hip
• closing the wound

POSTOPERATIVE:

        Rehabilitation is needed.

*Reference - Maheshwari and Mhaskar (Jaypee).