Aims. Higher osteoblastic bone activity is expected in aseptic loosening and painful unicompartmental knee arthroplasty (UKA). However, insights into normal bone activity patterns after medial UKAs are lacking. The aim of this study was to identify the evolution in bone activity pattern in well-functioning medial
This study compared the outcome of total knee
replacement (TKR) in adult patients with fixed- and
The purpose of this study was to undertake a
meta-analysis to determine whether there is lower polyethylene wear and
longer survival when using
This prospective randomised controlled double-blind
trial compared two types of PFC Sigma total knee replacement (TKR),
differing in three design features aimed at improving flexion. The
outcome of a standard fixed-bearing posterior cruciate ligament-preserving
design (FB-S) was compared with that of a high-flexion rotating-platform
posterior-stabilised design (RP-F) at one year after TKR. The study group of 77 patients with osteoarthritis of the knee
comprised 37 men and 40 women, with a mean age of 69 years (44.9
to 84.9). The patients were randomly allocated either to the FB-S
or the RP-F group and assessed pre-operatively and at one year post-operatively.
The mean post-operative non-weight-bearing flexion was 107° (95%
confidence interval (CI) 104° to 110°)) for the FB-S group and 113°
(95% CI 109° to 117°) for the RP-F group, and this difference was
statistically significant (p = 0.032). However, weight-bearing range
of movement during both level walking and ascending a slope as measured
during flexible electrogoniometry was a mean of 4° lower in the RP-F
group than in the FB-S group, with 58° (95% CI 56° to 60°) Although the RP-F group achieved higher non-weight-bearing knee
flexion, patients in this group did not use this during activities
of daily living and reported more pain one year after surgery
Aims. The optimal bearing surface design for medial unicompartmental knee arthroplasty (UKA) remains controversial. The aim of this study was to compare outcomes of fixed-bearing (FB) and
Aims. Since redesign of the Oxford phase III
Bone mineral density (BMD) around the femoral component has been reported to decrease after total knee replacement (TKR) because of stress shielding. Our aim was to determine whether a cemented
We have examined the outcome of 400 consecutive patients who underwent total knee replacement with the Low Contact Stress
We compared patient-reported outcomes of the Kinemax fixed- and
Aims. This study compares the PFC total knee arthroplasty (TKA) system in a prospective randomized control trial (RCT) of the
The Oxford
The contraindications for unicompartmental knee replacement (UKR) remain controversial. The views of many surgeons are based on Kozinn and Scott’s 1989 publication which stated that patients who weighed more than 82 kg, were younger than 60 years, undertook heavy labour, had exposed bone in the patellofemoral joint or chondrocalcinosis, were not ideal candidates for UKR. Our aim was to determine whether these potential contraindications should apply to patients with a
Aims. Altered alignment and biomechanics are thought to contribute to the progression of osteoarthritis (OA) in the native compartments after medial unicompartmental knee arthroplasty (UKA). The aim of this study was to evaluate the bone activity and remodelling in the lateral tibiofemoral and patellofemoral compartment after medial
Between April 2004 and July 2007, we performed 241 primary total knee replacements in 204 patients using the e.motion posterior cruciate-retaining, multidirectional mobile-bearing prosthesis. Of these, 100 were carried out using an image-free navigation system, and the remaining 141 with the conventional technique. We conducted a retrospective study from the prospectively collected data of these patients to assess the early results of this new
Aims. It is not clear whether anterior knee pain and osteoarthritis
(OA) of the patellofemoral joint (PFJ) are contraindications to
medial unicompartmental knee arthroplasty (UKA). Our aim was to
investigate the long-term outcome of a consecutive series of patients,
some of whom had anterior knee pain and PFJ OA managed with UKA. Patients and Methods. We assessed the ten-year functional outcomes and 15-year implant
survival of 805 knees (677 patients) following medial mobile-bearing
UKA. The intra-operative status of the PFJ was documented and, with
the exception of bone loss with grooving to the lateral side, neither
the clinical or radiological state of the PFJ nor the presence of
anterior knee pain were considered a contraindication. The impact
of radiographic findings and anterior knee pain was studied in a
subgroup of 100 knees (91 patients). Results. There was no relationship between functional outcomes, at a mean
of ten years, or 15-year implant survival, and pre-operative anterior
knee pain, or the presence or degree of cartilage loss documented
intra-operatively at the medial patella or trochlea, or radiographic
evidence of OA in the medial side of the PFJ. In 6% of cases there
was full thickness cartilage loss on the lateral side of the patella.
In these cases, the overall ten-year function and 15-year survival
was similar to those without cartilage loss; however they had slightly
more difficulty with descending stairs. Radiographic signs of OA
seen in the lateral part of the PFJ were not associated with a definite
compromise in functional outcome or implant survival. Conclusion. Severe damage to the lateral side of the PFJ with bone loss and
grooving remains a contraindication to
Before proceeding to longer-term studies, we have studied the early clinical results of a new
Components from 73 failed knee replacements (TKRs) consisting of rotating-platform,
We compared the results of 146 patients who received an anatomic modular knee fixed-bearing total knee replacement (TKR) in one knee and a low contact stress rotating platform