Vertical Relationship Ratio (VRR): A High Reliability and Accuracy Radiographic Measurement for Basilar Invagination in Rheumatoid Arthritis

Monchai Ruangchainikom; Ekkapoj Korwutthikulrangsri; Apisit Rattanatanasarn; Ishthayapong Kanjanakeereewong; Win Boonsirikamchai; Panlop Tirawanish; Surin Thanapipatsiri; Werasak Sutipornpalangkul

doi:10.12659/MSM.943329

18 February 2024 : Clinical Research

Vertical Relationship Ratio (VRR): A High Reliability and Accuracy Radiographic Measurement for Basilar Invagination in Rheumatoid Arthritis

Monchai Ruangchainikom^1ABDEF, Ekkapoj Korwutthikulrangsri^1E, Apisit Rattanatanasarn^1C, Ishthayapong Kanjanakeereewong^1C, Win Boonsirikamchai^2C, Panlop Tirawanish^3C, Surin Thanapipatsiri^1A, Werasak Sutipornpalangkul

^1ADE*

DOI: 10.12659/MSM.943329

Med Sci Monit 2024; 30:e943329

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Table 1 Demographic data and different measurement parameters in each group of patients.

	Non-RA (n=56)	RA with BI (n=28)	RA without BI (n=37)	P value

Male	23 (65.7%)	10 (33.3%)^*	6 (16.7%)^**	<0.001^a
Female	12 (34.3%)	20 (66.7%)	30 (83.3%)

Mean±SD	39.80±14.56	59.00±11.85^*	57.06±15.61^**	<0.001^b
Median (range)	42.00 (18–68)	60.00 (39–89)	58.00 (23–90)

Vertical relationship ratio
Median (range)	2.12 (2.03–2.36)	1.84 (1.17–2.16)^*	2.24 (2.02–2.56)^***	<0.001^c
Mean±SD	2.16±0.11	1.79±0.23	2.22±0.12
Ranawat method (mm)
Median (range)	17.14 (14.36–23.26)	11.81 (3.52–21.98)^*	16.92 (10.33–20.81)^***
Mean±SD	17.59±1.92	12.16±3.94	16.54±2.01	<0.001^c
Modified Ranawat (mm)
Mean±SD	34.69±2.46	27.68±4.78^*	32.68±2.69,^**	<0.001^b
Range	30.77–40.81	18.08–39.96	26.39–40.31
95% CI	33.85–35.54	25.90–29.47	31.77–33.59
Redlund-Johnell line (mm)
Mean±SD	41.91±5.70	34.30±5.87^*	39.30±5.67^***	<0.001^b
Range	32.36–53.02	19.56–45.83	27.31–49.83
95% CI	39.95–43.87	32.11–36.49	37.38–41.21
Non-RA – non-rheumatoid arthritis patients, RA with BI – rheumatoid arthritis patients with basilar invagination, RA without BI – rheumatoid arthritis patients without basilar invagination. ^* , , have value less than 0.05, ^* Non-RA group vs RA with BI group, ^ Non-RA group vs RA without BI group, ^* RA with BI vs RA without BI. Statistical analysis by ^a chi-square test, ^b One-way ANOVA, ^c Kruskal-Wallis test.

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Vertical Relationship Ratio (VRR): A High Reliability and Accuracy Radiographic Measurement for Basilar Invagination in Rheumatoid Arthritis

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