The outcome of the Mobility total ankle replacement at a mean of four years: Can poor outcomes be predicted from pre- and post-operative analysis?
We performed a retrospective review of a consecutive series of 178 Mobility total ankle replacements (TARs) performed by three surgeons between January 2004 and June 2009, and analysed radiological parameters and clinical outcomes in a subgroup of 129 patients. The mean follow-up was 4 years (2 to 6.3). A total of ten revision procedures (5.6%) were undertaken. The mean Ankle Osteoarthritis Scale (AOS) pain score was 17 (0 to 88) and 86% of patients were clinically improved at follow-up. However, 18 patients (18 TARs, 14%) had a poor outcome with an AOS pain score of > 30. A worse outcome was associated with a pre-operative diagnosis of post-traumatic degenerative arthritis. However, no pre- or post-operative radiological parameters were significantly associated with a poor outcome. Of the patients with persistent pain, eight had predominantly medial-sided pain. Thirty TARs (29%) had a radiolucency in at least one zone. The outcome of the Mobility TAR at a mean of four years is satisfactory in > 85% of patients. However, there is a significant incidence of persistent pain, particularly on the medial side, for which we were unable to establish a cause.
Tauranga Hospital, Department of Orthopaedic Surgery, Private Bag 12024, Tauranga, New Zealand.
D
D
Muir
J
J
Aoina
T
T
Hong
R
R
Mason
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000843:Ankle Joint / Q000000981:diagnostic imaging; D058737:Arthroplasty, Replacement, Ankle / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery; D010146:Pain / Q000209:etiology; D010147:Pain Measurement / Q000379:methods; D019990:Perioperative Care / Q000379:methods*; D011379:Prognosis; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome
Ankle osteoarthritis scale; Mobility; TAR; Total ankle replacement