How much preoperative flexion contracture is a predictor for residual flexion contracture after total knee arthroplasty in hemophilic arthropathy and rheumatoid arthritis?

Table 1 Patient demographics

	Hemophilia	Rheumatoid arthritis	p-Value
Number of knees (patients)	48 (37)	92 (63)
Hemophilia type A/B^a	32/5
Hemophilia severity (severe/moderate)^b	4/33
HIV (negative/positive)	37/0	63/0
HBV (negative/positive)	14/23	33/30	0.159
HCV (negative/positive)	10/27	63/0	< 0.001
Factor inhibitor (negative/positive)	31/6
Age (years)	46.7 ± 11.2	57.4 ± 10.1	< 0.001
Female/male	3/34	58/5	< 0.001
Body mass index (kg/m²)	22.4 ± 2.8	25.0 ± 4.0	0.011
Right/left	26/22	49/43	0.919
Normal patellar height/patella baja	34/14	87/5	< 0.001
Operating period	2002–2018	2003–2018
CR/PS/CCK^c	1/46/1	9/80/3	0.321
PFC/Triathlon/Lospa/NexGen/Persona/Attune^d	12/24/9/0/2/1	56/1/1/13/12/9	< 0.001
Surgical approach (MPPA/rectus snip/V–Y quadricepsplasty)	44/1/3	92/0/0	0.013
Patella resurfacing/patella non-resurfacing	46/2	86/6	0.715
Follow-up period (years)	8.8 ± 4.9	8.0 ± 4.6	0.389

MPPA medial parapatellar approach with general method
^aType A/B, patient deficient of coagulation factor VIII/IX
^bSevere/moderate, factor level of < 1%/1–5%
^cCR/PS/CCK, the types of prostheses implanted, including those retaining and substituting of the posterior cruciate ligament and constrained condylar knee
^dPFC/Triathlon/Lospa/NexGen/Persona/Attune, PFC (Press Fit Condylar, Depuy, Raynham, MA), Triathlon (Stryker, Mahwah, NJ), Lospa (Corentec, Seoul, Korea), NexGen (Zimmer, Warsaw, Indiana), Persona (Zimmer, Warsaw, Indiana), Attune (Depuy, Raynham, MA)

ISSN: 2234-2451