Long-term results of total knee arthroplasty in haemophilic patients: an 18-year follow-up.

PURPOSE: Total knee arthroplasty (TKA) for patients with end-stage haemophilic arthropathy is considered to be a successful procedure with satisfying mid- to long-term results. It was the purpose of this study to provide clinical and radiological long-term results of TKAs implanted in a consecutive cohort of haemophilic patients.

METHODS: Primary TKA was performed in 43 consecutive knees in 30 haemophilic patients. After a mean of 18 (SD ± 4) years, 15 patients (21 knees) with a mean age of 58 (SD ± 8) years were available for follow-up. The outcome was assessed using the Knee Society score, WOMAC, SF-36, Kaplan-Meier survivorship analysis as well as radiographic evaluation of radiolucency.

RESULTS: In 13 (30%) of the 43 consecutive knees, revision surgery was necessary due to infection or aseptic loosening, among which eight (19%) due to aseptic loosening and five (12%) due to haematogenous infection. The calculated 20-year survival rates with revision for any reason or infection as the end points were 59 and 82%, respectively. All patients with the primary TKA in situ observed progressive radiolucent lines around the implants at the final follow-up. The Knee Society clinical and functional score significantly improved from pre- (36 points; SD ± 16 and 62 points; SD ± 19) to post-operatively (73 points; SD ± 15 and 78 points; SD ± 18; p < 0.001). Eighty-six per cent rated their result as either good or excellent. Whereas flexion did not improve, flexion contracture could be reduced significantly from 18° (SD ± 12) to 6° (SD ± 5; p < 0.001) post-operatively.

CONCLUSION: Total knee arthroplasty in haemophilic patients is associated with high revision, loosening and infection rates after 18 years. However, if revision can be avoided, joint replacement in haemophilic patients helps to relieve pain, achieve higher subjective satisfaction and to restore knee function. Level of evidence IV.