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Table 1 Clinical outcomes in the modified group and the conventional group

From: A novel extramedullary technique to guide femoral bone preparation in mobile unicompartmental knee arthroplasty based on tibial cut and overall alignment

 Group A—modified group(mean ± SD(range))Group B—conventional group(mean ± SD(range))t/χ2 valuep value
Number (knees)5050  
Sex (male/female)11/3913/370.2190.640
Side (right/left)25/2521/290.6440.422
Age (years)69.14 ± 9.06(51~85)67.78 ± 9.12(49~85)0.7480.456
BMI (kg/m2)26.34 ± 3.90(18.3~35.2)26.58 ± 2.76(20.8~31.1)− 0.3500.727
Mean follow-up (months)39.34 ± 5.83 (30~51 )40.17 ± 5.74(30~51)− 0.7940.429
Operating time (minutes)54.78 ± 7.95(38~78)59.14 ± 10.91(40~88)− 2.2840.025
Preoperative HSS score58.60 ± 7.86(39~77)59.86 ± 8.33(43~77)− 0.7780.438
Postoperative HSS score91.42 ± 5.21(75~98)92.18 ± 4.76(76~99)− 0.7610.448
Preoperative range of motion (degrees)121.16 ± 9.76(98~132)124.59 ± 8.07(108~134)− 1.9150.058
Postoperative range of motion (degrees)125.96 ± 8.22(104~139)124.96 ± 5.70(113~140)0.7030.484
Preoperative Hemoglobin (g/L)134.12 ± 11.25(108~180)134.00 ± 12.58(108~180)0.0500.960
Postoperative Hemoglobin (g/L)121.78 ± 10.72(100~158)117.26 ± 9.42(90~142)2.2400.027
Hemoglobin drop (g/L)12.34 ± 4.98(4~25)16.74 ± 7.54(5~38)− 3.4440.001
  1. Abbreviations: HSS Hospital for Special Surgery, ROM range of motion