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 2

Comparison of KSS and satisfaction by group.

	CCK group (n = 33)^a	RHK group (n = 30)^a	P value
Preoperative KSS
Knee	46.6 ± 11.7 [12 – 69]	45.6 ± 14.9 [20 – 85]	n.s.
Function	47.3 ± 14.8 [10 – 80]	30.9 ± 19.5 [0 – 68]	0.05
Total	93.9 ± 21.6 [27 – 129]	76.5 ± 28.6 [20 – 135]	0.008
Postoperative KSS
Knee	70.5 ± 10.2 [36 – 87]	60.7 ± 14.4 [41 – 95]	0.003
Function	74.9 ± 12.5 [40 – 100]	47.7 ± 21.4 [10 – 90]	0.004
Total	145.3 ± 20 [81 – 179]	108.4 ± 32.8 [51 – 169]	0.03
KSS Improvement
Knee	23.9 ± 14.1 [−21 – 58]	15.2 ± 15.9 [−14 – 51]	0.03
Function	27.6 ± 17.8 [−5 – 60]	16.7 ± 28.1 [−40 – 70]	n.s.
Total	51.5 ± 27.6 [−21 – 98]	31.9 ± 40.2 [−54 – 121]	0.03
Postoperative satisfaction	26/33 (78.8%)	14/30 (46.7%)	0.01

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

CCK: Condylar Constrained Knee; RHK: Rotating hinge knee; KSS = Knee society score; n.s.: non-significant

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