Diagnosis, preoperative evaluation, classification and total hip arthroplasty in patients with long-term unreduced hip joint dislocation, secondary osteoarthritis and pseudoarthrosis

Table 6 Comparison of surgical techniques, function outcome and complications between patients with long-term unreduced hip joint dislocation, secondary osteoarthritis and pseudoarthrosis and controls

Characteristics		Type A			Type B			Type C
		Patients (n = 6)	Controls (n = 100)	P	Patients (n = 9)	Controls (n = 100)	P	Patients (n = 1)	Controls (n = 100)	P
Surgical technique
Approach (n)	Anterior	2	15	0.235^b	1	7	0.651^b	0	0	–
Approach (n)	Posterior	4	85		8	93		1	100
Shell diameter (mm)		49.67 ± 2.34	50.44 ± 4.02	0.648^a	44.00 ± 5.10	45.46 ± 4.21	0.334^a	50.00	53.36 ± 4.88	–
Bone grafting^c (n)	N/A	6	92	0.471^b	3	67	0.108^b	0	23	–
	Non-Structural	0	8		2	8		0	45
	Structural^d	0	0		4	25		1	32
Harris Score		91.50 ± 6.89	92.87 ± 4.82	0.794^a	89.78 ± 4.82	88.97 ± 6.44	0.578^a	82.00	81.24 ± 10.89	–
Complication (n)	N/A	5	85	0.566^b	5	72	0.286^b	1	70	–
	DVT	0	11		2	15		0	16
	Heterotopic ossification	1	3		1	3		0	7
	SSI	0	2		1	2		0	5
	Dislocation	0	2		0	8		0	5
	Periprosthetic fracture	0	1		0	7		0	4
	Aseptic loosen	0	0		0	0		0	1

Note: Because more than one type of complication could be identified in a single patient, the overall count of complications may be more than the number of patients
DVT deep vein thrombosis, SSI surgical site infection
^aMann-Whitney U test
^bChi-square test
^cOnly includes acetabular bone grafting
^dIncludes acetabular augmentation

ISSN: 1471-2474