Mai Kenny T, Verioti Christopher A, Ezzet Kace A, Copp Steven N, Colwell Clifford W
Orthopaedic Surgeon, Hanford Orthopaedics, California.
Am J Orthop (Belle Mead NJ). 2013 Aug;42(8):353-7.
Some patients have been less than satisfied with flexion after total knee arthroplasty (TKA). As early designs provided limited flexion, companies have developed high-flexion designs. We conducted a study to compare flexion between 2 standard and 3 high-flexion designs and to compare clinical and radiographic postoperative flexion. Clinical and radiographic measurements were obtained by 3 independent orthopedists. Clinical flexion, with the patient maximally bending his or her knee as far as possible, was measured with a goniometer, recorded, and compared with measurements from lateral radiographs of the knee in the same position. A total of 144 knees (108 patients) were included in the study. Mean preoperative flexion was 110° for both groups, and mean postoperative flexion was 111° clinically and 109° radiographically for the standard designs, and 114° clinically and 117° radiographically for the high-flexion designs (P<.05). The groups had similar preoperative and postoperative Knee Society knee and function scores. Measurements obtained by the 3 independent examiners were highly correlated. Compared with the standard designs, the highflexion designs demonstrated statistically significantly more flexion, though the clinical increase in flexion was relatively small (3º).
一些患者对全膝关节置换术（TKA）后的膝关节屈曲情况不太满意。由于早期设计的膝关节屈曲受限，各公司已开发出高屈曲设计。我们进行了一项研究，比较2种标准设计和3种高屈曲设计之间的膝关节屈曲情况，并比较术后临床和影像学的膝关节屈曲情况。临床和影像学测量由3位独立的骨科医生进行。临床屈曲情况是让患者尽可能最大限度地弯曲膝关节，用角度计测量并记录，然后与同一位置膝关节的侧位X线片测量结果进行比较。该研究共纳入144个膝关节（108例患者）。两组术前平均屈曲角度均为110°，标准设计术后临床平均屈曲角度为111°，影像学为109°；高屈曲设计术后临床平均屈曲角度为114°，影像学为117°（P<0.05）。两组术前和术后的膝关节协会膝关节及功能评分相似。3位独立检查者获得的测量结果高度相关。与标准设计相比，高屈曲设计在统计学上显示出明显更多的屈曲，尽管临床屈曲增加相对较小（3°）。
