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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 7, 879-884.
doi: 10.1302/0301-620X.90B7.20566  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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Does the joint line matter in revision total knee replacement?

A. J. Porteous, FRCS(Trauma & Orth), Consultant Orthopaedic Surgeon1; M. A. Hassaballa, MCh(Orth), MD, Knee Researcher1; and J. H. Newman, FRCS, Consultant Orthopaedic Surgeon1

1 Bristol Knee Group, Avon Orthopaedic Centre Southmead Hospital, Southmead Road, Bristol BS10 5NB, UK.

Correspondence should be sent to Mr A. J. Porteous; e-mail: andrew.porteous{at}nbt.nhs.uk

We identified 148 patients who had undergone a revision total knee replacement using a single implant system between 1990 and 2000. Of these 18 patients had died, six had developed a peri-prosthetic fracture and ten had incomplete records or radiographs. This left 114 with prospectively-collected radiographs and Bristol knee scores available for study. The height of the joint line before and after revision total knee replacement was measured and classified as either restored to within 5 mm of the pre-operative height or elevated if it was positioned more than 5 mm above the pre-operative height. The joint line was elevated in 41 knees (36%) and restored in 73 (64%).

Revision surgery significantly improved the mean Bristol knee score from 41.1 (SD 15.9) pre-operatively to 80.5 (SD 15) post-operatively (p < 0.001). At one year post-operatively both the total Bristol knee score and its functional component were significantly better in the restored group than in the elevated group (p < 0.01). Overall, revision from a unicondylar knee replacement required less use of bone graft, fewer component augments, restored the joint line more often and gave a significantly better total Bristol knee score (p < 0.02) and functional score (p < 0.01) than revision from total knee replacement.

Our findings show that restoration of the joint line at revision total knee replacement gives a significantly better result than leaving it unrestored by more than 5 mm. We recommend the greater use of distal femoral augments to help to achieve this goal.




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Is it joint line and/or patella height that matters?
Benedict A Rogers
J Bone Joint Surg Br Online, 9 Jul 2008 [Full text]

(c) British Editorial Society of Bone and Joint Surgery All Rights Reserved
Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General