Following a total hip arthroplasty, adherence to specific movement protocols is crucial to ensure proper healing and prevent dislocation. The process of sitting on a sofa requires a methodical approach that respects post-operative precautions, primarily the avoidance of hip flexion beyond 90 degrees.
The initial step involves selecting an appropriate seating surface. A low, soft sofa should be avoided, as it can cause the hips to drop below the knees, violating the 90-degree rule. A firmer, higher sofa is preferable. If necessary, the height of the seating surface can be increased by placing firm cushions or pillows on it.
To begin the movement, the individual should use their walking aid, such as a walker or crutches, to back up toward the sofa until the backs of their legs make contact with its edge. This tactile feedback confirms proximity. The next step is to slide the operated leg slightly forward, keeping the foot on the floor. This maneuver pre-positions the hip in a safe, extended state. The individual should then reach back with both hands to securely grip the armrests or the surface of the sofa for stability.
The descent onto the sofa must be controlled. By transferring weight onto the arms and the non-operated leg, the individual can slowly lower their body onto the prepared surface. It is essential to avoid an uncontrolled drop or "plop," as this can place undue stress on the new joint. Throughout this lowering phase, the operated leg should remain extended forward. Once seated, one can carefully adjust their position to ensure the back is supported and the feet are resting comfortably on the floor, all while maintaining the critical hip angle of 90 degrees or less.
