Large flexion contracture angle predicts tight extension gap during navigational posterior stabilized-type total knee arthroplasty with the pre-cut technique: a retrospective study

Table 1 Preoperative patients’ demographics and clinical characteristics

	Group T (n = 19 patients)	Group E (n = 84 patients)	P value
Sex, male/female	4/15	17/67	n.s.^a
Age, years	69.2 ± 7.9	71.6 ± 8.4	n.s.
Body mass index, kg/m²	26.7 ± 4.7	26.6 ± 4.2	n.s.
Diagnosis, osteoarthritis/rheumatoid arthritis	15/4	67/17	n.s.^a
MTSA, °	9.0 ± 2.6	8.3 ± 3.2	n.s.
HKAA, °	10.4 ± 7.5	10.1 ± 5.0	n.s.
FCA, °	18.2 ± 9.2	7.6 ± 7.6	< 0.001*
Active maximum flexion angle, °	108.4 ± 25.5	120.5 ± 19.2	n.s.

Data are displayed as means ± standard deviation. Statistical differences were analyzed using the Mann–Whitney U test, except for Fisher’s exact tests (a). MTSA medial tibial slope angle, HKAA hip knee ankle angle, FCA flexion contracture angle, n.s not significant; (*) statistically significant (P < 0.05).

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