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| Comparative study of preoperative planning of acetabular cups for primary total hip arthroplasty between pelvic height planning and conventional templating |
| Dong1,ZHANG Huawu1,SUN Shui1,ZHOU Yonggang2,CHEN Jiying2,and HAO Libo2 |
1.Department of Orthopaedic Surgery,Shandong Provincial Hospital, Affiliated to Shandong University, Jinan, 250022 China;
2.Department of Orthopaedic Surgery,Chinese PLA General Hospital, Beijing,100853 China |
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Abstract Objective To evaluate the value of pelvic height planning and conventional templating for measurement of the acetabular cup size before primary total hip arthroplasty.Methods A comparative randomised study was conducted in Joint Department of PLA General Hospital between July 2014 and December 2014,involving 200 consecutive patients(288hips) who underwent primary THA. These patients were randomly and equally divided into Group A(conventional templating) and Group B (pelvic height planning). The size of cetabular cups were measured preoperatively with conventional templating and pelvic height planning respectively, and compared with the exact size of cups used intraoperatively.Results According to the exact size of acetabular cups, the cup size was close or within±one size in 57 (47.5%) cases, within ±two sizes in 49 (40.8%) , and within ±three sizes in 14 (11.7%) in Group A. The cup size was close or within±one size in 145 (86.3%) , within ±two sizes in 20 (11.9%) , and within ±three sizes in 3(1.8%) in Group B. The difference between the preoperative size and actual cup was (2.58±0.89) mm in group A and (1.38±1.22)mm in Group B. There was a statistically significant difference between the two groups using independent samples t-test(P=0.000).Conclusions The actual goodness of fit of pelvic height planning is significantly higher than that of conventional templating, which can be used as a method to measure the cup size before primary total hip arthroplasty.
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Received: 01 November 2016
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2017, Vol. 28 
