Table 3.

Reasons for accepted claims for treatment injuries following knee arthroplasty surgeries in Norway during 2008–2018. Values are count (%)

	All cases	TKA	UKA	PFA
Reason for accepted claim	n = 312	n = 284	n = 25	n = 3
Hospital-acquired infection	87 (28)	75 (26)	11	1
Misplaced implant	81 (26)	77 (27)	4	–
Early aseptic loosening a	40 (13)	37 (13)	3	–
Wrong indication	27 (9)	23 (8)	3	1
Wrong choice of implant	12 (4)	10 (4)	2	–
Peroperative nerve injury	12 (4)	11 (4)	–	1
Inadequate follow-up	10 (3)	10 (4)	–	–
Peroperative vascular injury	10 (3)	10 (4)	–	–
Peroperative tendon/
ligament injury	9 (3)	8 (3)	1	–
Wrong or inadequate
antithrombotic prophylaxis	4 (1)	4 (1)	–	–
Peroperative fracture	4 (1)	4 (1)	–	–
Nerve injury due from
bandage/cuff	3 (1)	3 (1)	–	–
Pain	3 (1.0)	3 (1)	–	–
Delayed treatment	3 (1.0)	3 (1)	–	–
Wrong technique	3 (1.0)	2 (0.5)	1	–
Radial nerve damage from
patient positioning	1 (0.3)	1 (0.3)	–	–
Burn injury from diathermic plate	1 (0.3)	1 (0.3)	–	–
Decubitus from inadequate
postoperative care	1 (0.3)	1 (0.3)	–	–
Other	1 (0.3)	1 (0.3)	–	–

TKA, total knee arthroplasty; UKA, unicompartmental knee arthroplasty; PFA, patellofemoral arthroplasty.

^a Within 3 years.