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[Correlation between shifting of gravity center position and functional recovery after total hip arthroplasty in patients who suffered from avascular necrosis of the femoral head].

OBJECTIVE
To explore correlation between shifting of gravity center position (GCP) and functional recovery after total hip arthroplasty (THA) in patients who suffered from avascular necrosis of the femoral head.


METHODS
Eighty six patients (49 right hip, 37 left hip) with avascular necrosis of the single femoral head who underwent THA at our department from January 2011 to December 2013 were investigated. Each patient was evaluated with Harris score system and measured GCP by corresponding instrument preoperatively and six month, one-year postoperatively. Pearson's correlation analysis was used to analyze the correlation between shifting degree of GCP and changing degree of Harris score at the above time points.


RESULTS
Harris score significantly improved after surgery (P<0.01), and there was a direct linear relationship between shifting degree of GCP and changing degree of Harris score at the same period after the surgery, and the adjusted R(2) value between them were 0.521 at six month and 0.46 at one year after operation.


CONCLUSIONS
As the function of the hip recovers, the GCP moves from its initial position to the operative side after THA. The shifting degree of GCP can be a reflection of recovery of the joint function in some extent.