Matejcic Aljosa, Vidovic Dinko, Nebergall Audrey, Greene Meridith, Bresina Stephen, Tepic Slobodan, Malchau Henrik, Hodge William A
University Hospital "Sisters of Mercy", Zagreb - Croatia.
Massachusetts General Hospital, Massachusetts - USA.
Hip Int. 2015 Sep-Oct;25(5):477-83. doi: 10.5301/hipint.5000254. Epub 2015 May 27.
Scyon Orthopaedics AG developed a new mode of cementless fixation of the femoral component that provides immediate and permanent anchorage by monocortical locking screws. The aim of this study was to evaluate the stability of the Scyon total hip replacement (THR) stem in-vivo.
A total of 15 patients, with an average age of 50 years had surgery between 2008 and 2011. Each patient received a Scyon THR. Standard questionnaires were completed at each follow-up visit for evaluation of functional outcomes. RSA, patient reported outcomes, and plain radiographic follow-up were obtained at 6 months, 1 year, 2 years, and 5 years postoperatively.
The median ± standard error (SE) stem subsidence (negative y-translation) was 0.07 ± 0.07 mm at 1 year, 0.05 ± 0.04 mm at 2 years and 0.04 ± 0.13 mm at 5 years. The median ± SE stem rotation (y-rotation) was 0.1 ± 0.21 degrees at 1 year, 0.51 ± 0.31 degrees at 2 years and 0.60 ± 0.37 degrees at 5 years. Plain radiographs showed bone on-growth onto medial aspect of the stem. Median HHS improved from 55 preoperatively to 93 at 1 year and 97 at 5 years. The median UCLA Activity Score improved from 4 preoperatively to 6 at 1 year and 5 years.
RSA results indicate that the Scyon stem with its 5 monocortical locking screws is stable at 5 years. Immediate surgical fixation of the stem and bony on-growth onto the femoral component may ultimately decrease the rate of aseptic stem loosening in these THR patients.
Scyon骨科股份公司研发了一种新型股骨组件非骨水泥固定方式，通过单皮质锁定螺钉实现即刻和永久锚固。本研究旨在评估Scyon全髋关节置换（THR）柄在体内的稳定性。
2008年至2011年间，共15例平均年龄50岁的患者接受了手术。每位患者均接受了Scyon THR。每次随访时均填写标准问卷以评估功能结果。术后6个月、1年、2年和5年进行RSA、患者报告结果及普通X线片随访。
柄下沉（负y轴平移）的中位数±标准误差（SE）在1年时为0.07±0.07mm，2年时为0.05±0.04mm，5年时为0.04±0.13mm。柄旋转（y轴旋转）的中位数±SE在1年时为0.1±0.21度，2年时为0.51±0.31度，5年时为0.60±0.37度。普通X线片显示柄内侧有骨长入。HHS中位数从术前的55分提高到1年时的93分和5年时的97分。UCLA活动评分中位数从术前的4分提高到1年和5年时的6分。
RSA结果表明，带有5枚单皮质锁定螺钉的Scyon柄在5年时是稳定的。柄的即刻手术固定以及股骨组件上的骨长入最终可能降低这些THR患者无菌性柄松动的发生率。
