The effect of tibial implant size on post-operative alignment following medial unicompartmental knee replacement

Hopgood, P.; Martin, Carol; Rae, Paul

doi:10.1016/j.knee.2003.12.008

Cited by 27 publications

(24 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may also have been a reason for the numbers of progression of lateral compartment osteoarthritis [21]. Due to the small number of revision procedures in this cohort, the non-statistically significant finding may be related to a type II statistical error [22], and there may be, as suggested by previous authors, a relationship between bearing size and early implant failure [20,21]. Large bearing size also means deeper tibial cuts.…”

Section: Discussionmentioning

confidence: 77%

“…Large bearing thicknesses (greater than 6 mm) were used for a number of patients in this series (Table 2). Whilst this was not shown to be a statistically important variable in revision risk, by using the largest possible bearing, the knee can be overcorrected into valgus alignment to overloading the lateral compartment [20]. This may also have been a reason for the numbers of progression of lateral compartment osteoarthritis [21].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The mid-term clinical results of the phase 3 Oxford unicompartmental knee arthroplasty: a 6- to 8-year follow-up

Smith

Clark

Glasgow

et al. 2011

Eur J Orthop Surg Traumatol

View full text Add to dashboard Cite

Unicompartmental knee arthroplasty (UKA) is widely performed in the United Kingdom for the management of patients with symptomatic osteoarthritis of the medial compartment of the tibiofemoral joint. A limited number of papers have presented the findings of mid-term clinical and survival data with sufficiently large patient numbers following mobile-bearing UKA. The purpose of this study was to present the 6- to 8-year follow-up data on a series of 230 minimally invasive medial Oxford Phase 3 mobile-bearing UKAs in our institution. Data on surgical procedure, postoperative rehabilitation requirement, complications, revision procedures and Oxford Knee Score (OKS), Short Form-12 (SF-12) and visual analogue scale (VAS) pain scores were analysed. The results indicated that the majority of patient’s recoveries were uneventful, with 96% experiencing no postoperative complications. The mean OKS, VAS pain and SF-12 scores indicated good functional outcomes and acceptable perceived general health for this age group. Twenty-one patients underwent revision surgery, indicating a survival rate of 85% (95% CI: 0.76–0.91) during the 6- to 8-year follow-up period. The most frequently cited indication for revision was due to progression of osteoarthritis to the lateral component. To conclude, this series indicated that the mobile-bearing Oxford UKA provides good clinical outcomes at 6- to 8-year follow-up, with minimal requirement for postoperative rehabilitation, few complications and an acceptable survivorship in the mid-term

show abstract

Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

The mid-term clinical results of the phase 3 Oxford unicompartmental knee arthroplasty: a 6- to 8-year follow-up

Smith

Clark

Glasgow

et al. 2011

Eur J Orthop Surg Traumatol

View full text Add to dashboard Cite

show abstract

“…Preoperatively, three observers (SB, NL, TB) with no clinical contact with the patients determined the femorotibial angle (FTA) (Fig. 1A) [14]. The FTA was determined by locating a point 10 cm above and below the joint line, and taking the midpoint of the femur and tibia at these levels.…”

Section: Methodsmentioning

confidence: 99%

“…was determined as described previously [14], whereas the postoperative TPA was measured as the angle subtended by the tangent to the plane of medial tibial plateau resection and the proximal anatomic axis of the tibia [10]. The postoperative PTS was ascertained as the angle included by the tangent to the medial tibial plateau resection plane and the anatomic axis of the tibia in the sagittal plane [10].…”

Section: Methodsmentioning

confidence: 99%

Is Unicompartmental Arthroplasty an Acceptable Option for Spontaneous Osteonecrosis of the Knee?

Bruni

Iacono

Raspugli

et al. 2012

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

Background The literature suggests survivorship of unicompartmental knee arthroplasties (UKAs) for spontaneous osteonecrosis of the knee ranges from 93% to 97% at 10 to 12 years. However, these data arise from small series (23 to 33 patients), jeopardizing meaningful conclusions. Questions/purposes We determined (1) the longer-term survivorship of UKAs in a larger group of patients with spontaneous osteonecrosis of the knee; (2) their subjective, symptomatic, and functional outcomes; and (3) the percentage of failures and reasons for failures to identify relevant indications, contraindications, and technical parameters for treatment with a modern implant design. Methods We retrospectively evaluated all 84 patients with late-stage spontaneous osteonecrosis of the knee who had a medial UKA from 1998 to 2005. All patients had preoperative MRI to confirm the diagnosis, exclude metaphyseal involvement, and confirm the absence of major degenerative changes in the lateral and patellofemoral compartments. The mean age of the patients at surgery was 66 years and mean BMI was 28.9. We conducted KaplanMeier survival analysis using revision for any reason as the end point. Minimum followup was 63 months (mean, 98 months; range, 63-145 months). Results Ten-year survivorship was 89%. Ten revisions were performed; the most common reasons were subsidence of the tibial component (four) and aseptic loosening of the tibial component (three). No patient underwent revision for progression of osteoarthritis in the lateral or patellofemoral compartments. Conclusions Our data suggest spontaneous osteonecrosis of the knee may be an indication for UKA, provided secondary osteonecrosis of the knee is ruled out, preoperative

show abstract

“…Toshihiro et al [60] also recommended keeping the valgus knees slightly undercorrected after UKA and proposed a postoperative valgus alignment of 5°-7°to balance the forces in both compartments. Hopgood et al [61], in a medial UKA series, reported that the amounts of correction seen with 8 mm, 10 mm, 12 mm and 14 mm inserts were 5.3°, 4.8°, 6.6°and 9.5°, respectively.…”

Section: Complications Of Unicompartmental Arthroplastymentioning

confidence: 98%

Advances in unicompartmental knee arthroplasty with minimally invasive techniques

Maistrelli

Riaz

2006

J Orthopaed Traumatol

View full text Add to dashboard Cite

Unicompartmental arthroplasty has proved to be a reliable option for monocompartmental arthritis in well selected patients. Unicompartmental knee arthroplasty (UKA) is not a temporary procedure and its ten year survival is comparable to TKA and better than High Tibial Osteotomy. The success of the procedure depends on strict patient selection, meticulous surgical technique and proper implant selection. The renewed interest in UKA is due to improved results, more conservative nature of the procedure, faster rehabilitation, decreased cost and the minimally invasive techniques. The sedentary patient with unicompartmental arthritis is currently the primary indication for UKA. The role of unicompartmental arthroplasty in younger patients needs more investigation. Revision of UKA has not found to be as complicated as reported in the early series. Minimally invasive UKA has shown short term promising results but more long term studies showing similar implant longevity compared with the standard approach are required to establish its role. Due to high level of patient satisfaction and low morbidity and complications compared with TKA, unicompartmental arthroplasty is an attractive option for patients with predominantly unicompartmental non inflammatory arthritis.

show abstract

The effect of tibial implant size on post-operative alignment following medial unicompartmental knee replacement

Cited by 27 publications

References 7 publications

The mid-term clinical results of the phase 3 Oxford unicompartmental knee arthroplasty: a 6- to 8-year follow-up

The mid-term clinical results of the phase 3 Oxford unicompartmental knee arthroplasty: a 6- to 8-year follow-up

Is Unicompartmental Arthroplasty an Acceptable Option for Spontaneous Osteonecrosis of the Knee?

Advances in unicompartmental knee arthroplasty with minimally invasive techniques

Contact Info

Product

Resources

About