Condylar constrained knee prosthesis and rotating hinge prosthesis for revision total knee arthroplasty for mechanical failure have not the same indications and same results

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Table 1

Comparison of patient demographics by group.

	CCK group (n = 33)^a	RHK group (n = 30)^a	P value
Age at surgery (year)	65 ± 10 [47 – 87]	71 ± 8 [55 – 89]	0.008
Follow-up (months)	27.8 ± 5.2 [24 – 51]	33.3 ± 13.9 [24 – 78.8]	0.01
Sex (female)	20/33 (60.6%)	23/30 (76.7%)	n.s.
BMI	30.6 ± 4.1 [24.2 – 42.9]	30.9 ± 7.6 [19.8 – 55]	n.s.
Delay from primary TKA (months)	51.4 ± 61 (5.6 – 228)	49.9 ± 43.6 (2.2 – 137)	n.s.
ASA score
ASA 1	5 (15.2%)	5 (17.2%)	n.s.
ASA 2	18 (54.5%)	14 (46.7%)	n.s.
ASA 3	10 (30.3%)	11 (37.9%)	n.s.
Indication for revision
Aseptic loosening	17 (51.5%)	9 (30%)	n.s.
Femorotibial instability	9 (27.3%)	14 (46.7%)	n.s.
Stiffness	3 (9.1%)	4 (13.3%)	n.s.
Patellofemoral instability	2 (6.1%)	3 (10%)	n.s.
Persistent pain	2 (6.1%)	0 (0%)	n.s.
Preoperative flexion ROM (°)	107.3 ± 21 (60 – 135)	99.2 ± 25.9 (30 – 140)	n.s.
Preoperative mFTA (°)	178.4 ± 3.9 [166 – 185]	176.2 ± 8.1 [151 – 185]	n.s.

Data are presented as mean ± standard deviation [minimum – maximum] or number (proportion).

BMI: body mass index (kg/m²); ASA: American Society of Anesthesiologists; mFTA: mechanical femorotibial angle; ROM: Range of motion; n.s.: non-significant.

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