Syed Ali Raza, Adnan Latif Malik, Usman Nazir Gill, Suhail Malhotra, Muhammad Hanif Mian.
Different head sizes of femoral component: does this difference have impact on outcome after arthroplasty?.
Pak J Med Health Sci Jan ;13(4):879-82.

Aim : To compare the outcome in femoral head replacement of different head sizes (28 mm vs. 32mm ) for total hip arthroplasty (THA) . Study design : Randomized controlled trial. Place and duration of study: Department of orthopaedics, LGH , Lahore during 01-01-2018 to 31-12-2018. Methodology : In this study the cases of either gender with age more than 40 years undergoing total hip arthroplasty were included and divided into two equal groups . The cases in group A were managed by head size 32 mm or smaller and those in group B with 36mm or larger. These cases were followed after surgery regarding their outcome on the basis of Harris Hip Score (HHS), rate of hip dislocation and pain at 6 months where the final outcome was seen. Results : In the present study there were total 60 cases (30 in each group). The mean age of the participants was 65.33±8.37 vs 64.41±9.13 years with p= 0.87 in group A and B. There were 19 (63.33%) males in group A and 20 (66.67%) in group B (p= 1.0). Mean Harris Hip score before treatment was 30.51±10.11 vs. 31.57±9.39 (p= 1.0) and post treatment it was 67.19±17.63 vs.83.34±13.57 with p= 0.02 in group A and B respectively. Mean pain on VAS was 1.78±0.39 vs.2.78±0.47 (p= 0.13) in group A and group B respectively. Two patients from group A presented with dislocation within 1 year after THA . Conclusion: Larger head size is better than the smaller one in hip arthroplasty when it comes to Harris Hip score and rate of dislocation, but smaller head size is better in terms of post operative groin pain.

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