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Table 5 The percentages of femoral-implant surface contact area for each Gruen’s zone

From: Effect of trochanter displacement on impingement and bone contact in total hip arthroplasty performed after curved intertrochanteric varus osteotomy for osteonecrosis of the femoral head: a simulation study

 

CVO (29 hips)

Control (30 hips)

p value a

Zone 1

8.2 [2.3–15.1]

0.3 [0.1–0.7]

 < 0.001

Zone 2

2.2 [0.3–3.7]

4.1 [2.0–7.3]

0.038

Zone 3

1.8 [0.3–3.7]

2.2 [1.4–6.8]

0.139

Zone 5

4.6 [1.4–8.7]

3.8 [1.6–7.3]

0.471

Zone 6

2.1 [0.3–7.8]

1.6 [0.7–5.4]

0.844

Zone 7

26.2 [20.5–42.9]

2.0 [1.3–4.0]

 < 0.001

Zone 1–3, 5–7

8.5 [5.2–12.8]

2.9 [1.6–5.1]

 < 0.001

  1. Values are presented as medians [interquartile range]
  2. CVO Curved intertrochanteric varus osteotomy
  3. aMann–Whitney U test
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BMC Musculoskeletal Disorders

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