Berg E E, Mason S L, Lucas M J
Department of Orthopaedic Surgery, University of South Carolina School of Medicine, Columbia 29203, USA.
Am J Sports Med. 1996 Mar-Apr;24(2):218-21. doi: 10.1177/036354659602400218.
Three blinded observers on three separate occasions calculated four commonly employed patellar height ratios on the knees of 15 patients who had three lateral radiographs each. The observers used the same measurement instrument, a hand-held goniometer ruler, to determine the relative reliability of each patellar height ratio. The measurements by the three observers were examined, and the error and reliability of the four methods of measurement were tested statistically. Among the four methods of measuring patellar height that we studied, the Blackburne-Peel method most consistently reproduced the patellar height index. Interobserver measurement error averaged 0.06 for all ratios. Values greater than 0.06 represented real patellar height changes. The ratios were not significantly affected by the change of knee flexion angle from 30 degrees to 50 degrees. Side-to-side patellar height measurement differences averaged 0.16, which suggests that the healthy contralateral limb is not reliable as a control. Mild arthritic changes decreased variability of measurements by an average of 24% because small osteophytes better defined the articular margins of the patella.
三名盲法观察者在三个不同场合，对15名患者的膝盖计算了四种常用的髌股高度比值，每名患者有三张外侧位X线片。观察者使用同一测量工具——手持测角计尺，来确定每个髌股高度比值的相对可靠性。对三名观察者的测量结果进行了检查，并对四种测量方法的误差和可靠性进行了统计学检验。在我们研究的四种测量髌股高度的方法中，Blackburne-Peel法最能始终如一地重现髌股高度指数。所有比值的观察者间测量误差平均为0.06。大于0.06的值代表真正的髌股高度变化。这些比值不受膝关节屈曲角度从30度变为50度的显著影响。双侧髌股高度测量差异平均为0.16，这表明健康的对侧肢体作为对照并不可靠。轻度关节炎改变使测量变异性平均降低了24%，因为小骨赘能更好地界定髌骨的关节边缘。
