Table 3 Pearson’s or Spearman’s correlation between the change in the coronal lumbar-pelvic-femoral alignment after conversion to THA and possible associated factors.

From: Changes of the coronal lumbar-pelvic-femoral alignment after conversion total hip arthroplasty in patients with unilateral ankylosed hip

 

ΔLS (°)

ΔPO (°)

ΔHAA (°)

Age at conversion THA (years)

0.029

 − 0.157

 − 0.139

Height (cm)

0.276

0.118

0.096

Weight (kg)

0.150

 − 0.037

 − 0.107

Body mass index (kg/m2)

 − 0.136

 − 0.170

 − 0.244

Duration of arthrodesis (years)

 − 0.028

 − 0.180

 − 0.735****

Preoperative LS (°)

 − 0.621****

 − 0.671****

 − 0.613****

Preoperative PO (°)

 − 0.581****

 − 0.892****

 − 0.751****

Preoperative HAA (°)

 − 0.467****

 − 0.728****

 − 0.824****

Preoperative LLD (cm)

0.048

0.014

0.123

ΔLLD (cm)

0.059

0.020

0.028

Preoperative flexion (°)

 − 0.014

 − 0.032

 − 0.044

Preoperative extension (°)

0.153

0.145

0.248

Preoperative abduction (°)

 − 0.065

 − 0.348*

 − 0.350*

Preoperative adduction (°)

0.185

0.342*

0.419*

Preoperative external rotation (°)

0.279

 − 0.150

 − 0.193

Preoperative internal rotation (°)

 − 0.256

0.036

0.133

ΔJOA hip score (points)

0.274

0.369*

0.399**

  1. THA, total hip arthroplasty; LS, lumbar scoliosis; PO, pelvic obliquity; HAA, hip adduction angle; JOA, Japanese Orthopaedic Association.
  2. ΔLS: the difference between the LS before and after surgery. ΔPO: difference between the PO before and after surgery. ΔHAA: difference between the HAA before and after surgery. ΔJOA hip score: difference between the JOA hip score before and after surgery.
  3. Pearson’s correlation coefficient was calculated for variables without shade, and Spearman’s correlation coefficient was calculated for variables with shade. *p < 0.05, **p < 0.01, ***p < 0.005, ****p < 0.001.
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