Deschamps, Orthop Traumatol Surg Res 2010 - Total Knee Arthroplasty for Osteoarthritis Secondary to Extra-Articular Malunions

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Total Knee Arthroplasty for Osteoarthritis Secondary to Extra-Articular Malunions

Deschamps, French Hip and Knee Society (S.F.H.G.), et al.·Orthop Traumatol Surg Res·2010·42 citations·Retrospective cohort

Free Full Text·DOI·PubMed

Background

Post-traumatic total knee arthroplasty for extra-articular malunion requires correction of the deformity, either through asymmetrical bone resection (possibly inducing ligaments imbalance) or osteotomy at the time of arthroplasty. We report the results of a continuous multicenter, retrospective series of 78 patients (18 implants with osteotomy) with a mean 4 years of follow-up. The hypothesis is that the selected procedure requires to be based on the deformity's location and severity.

Methods

Patients:

With a mean age of 63 years (younger in the osteotomy group), 38 patients had femoral malunion, 36 had tibial malunion, and 4 had a combined malunion.
There were 70 frontal deformities (48 varus and 22 valgus) and 10 rotational deformities, often diaphyseal, 4 of which more than 20 .
12 patients had a history of infection; 8 had frontal laxity greater than 10 , and 15 a limited range of motion in flexion.
In 70 cases, semi- or nonconstrained implants were used, and in 8 cases more constrained implants, including 4 hinge prostheses.

Results

We observed two deep infections, one case of avulsion of the extensor mechanism, and two cases of aseptic loosening with femoral malunion and varus deformity.
Two osteotomies resulted in nonunion, one with internal fixation devices mobilization requiring revision using extension rods.
The function and pain scores were significantly improved.
The mobility improvements were moderate but did not compromise the surgical procedure main objective.
The preoperative hip-knee angle was corrected with both techniques.
Only the function score gain was greater for the isolated arthroplasty procedures.

Conclusions

The indications for arthroplasty alone were extended to 20 varus and 15 valgus, with no major residual laxity. Beyond 10 , hinge prosthesis should be available. Associated osteotomy can correct rotational deformities that cannot be compensated with bone cuts. In deformities that are close to the joint, osteotomy facilitates implantation of moderately constrained prosthesis. This indication is based on CAT scan rotational deformities measurements because rotational deformities require an osteotomy, and/or the presence of extraligamentous deformity that cannot be reduced with collateral ligaments surgical release.

Level of evidence: Level 4. Non-controlled retrospective study. Copyright remains with the authors and publisher.

Total Knee Arthroplasty for Osteoarthritis Secondary to Extra-Articular Malunions

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Total Knee Arthroplasty for Osteoarthritis Secondary to Extra-Articular Malunions

Deschamps, French Hip and Knee Society (S.F.H.G.), et al.·Orthop Traumatol Surg Res·2010·42 citations·Retrospective cohort

Free Full Text·DOI·PubMed

Background

Post-traumatic total knee arthroplasty for extra-articular malunion requires correction of the deformity, either through asymmetrical bone resection (possibly inducing ligaments imbalance) or osteotomy at the time of arthroplasty. We report the results of a continuous multicenter, retrospective series of 78 patients (18 implants with osteotomy) with a mean 4 years of follow-up. The hypothesis is that the selected procedure requires to be based on the deformity's location and severity.

Methods

Patients:

With a mean age of 63 years (younger in the osteotomy group), 38 patients had femoral malunion, 36 had tibial malunion, and 4 had a combined malunion.
There were 70 frontal deformities (48 varus and 22 valgus) and 10 rotational deformities, often diaphyseal, 4 of which more than 20 .
12 patients had a history of infection; 8 had frontal laxity greater than 10 , and 15 a limited range of motion in flexion.
In 70 cases, semi- or nonconstrained implants were used, and in 8 cases more constrained implants, including 4 hinge prostheses.

Results

We observed two deep infections, one case of avulsion of the extensor mechanism, and two cases of aseptic loosening with femoral malunion and varus deformity.
Two osteotomies resulted in nonunion, one with internal fixation devices mobilization requiring revision using extension rods.
The function and pain scores were significantly improved.
The mobility improvements were moderate but did not compromise the surgical procedure main objective.
The preoperative hip-knee angle was corrected with both techniques.
Only the function score gain was greater for the isolated arthroplasty procedures.

Conclusions

The indications for arthroplasty alone were extended to 20 varus and 15 valgus, with no major residual laxity. Beyond 10 , hinge prosthesis should be available. Associated osteotomy can correct rotational deformities that cannot be compensated with bone cuts. In deformities that are close to the joint, osteotomy facilitates implantation of moderately constrained prosthesis. This indication is based on CAT scan rotational deformities measurements because rotational deformities require an osteotomy, and/or the presence of extraligamentous deformity that cannot be reduced with collateral ligaments surgical release.

Level of evidence: Level 4. Non-controlled retrospective study. Copyright remains with the authors and publisher.

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