COMPARISON OF THE ACCURACY OF TOTAL HIP ARTHROPLASTY COMPONENT PLACEMENT BETWEEN CEMENTED AND UNCEMENTED IMPLANTS
0
Citation
0
Reference
20
Related Paper
Abstract:
Data from recent AOANJRR shows a higher incidence of acetabular revision for dislocation of THA in uncemented compared to cemented THA (RR 1.59). We hypothesized that a difference in accuracy of component placement may be a factor. We aimed to assess any difference in accuracy between these 2 types of THA. Patients undergoing navigated THA were prospectively recruited. Choice of uncemented or cemented THA was based on individual surgeon’s routine practice and preference and no adjustments were made for this study. All THAs (Cemented Exeter-21 and uncemented Trident/Secur fit-20) were performed through a posterior approach. Statistical analysis: the mean and 95% confidence intervals (or median and interquartile range (IQR) for non parametric data) for each measure in both groups. ANOVA and nonparametric Mann-Whitney U test (significance level 5%). Levene’s test for homogeneity, Comparison of frequencies with chi-squared test or Fishers Exact test. Bonferroni correction where necessary. We demonstrated a significant difference in reproducibility between components. Four of 20 (20%) uncemented cups deviated from the target inclination by 5 degrees or more compared to none of 21 in the cemented group (p=0.048). Seven of the 20 (35%) of the uncemented cups deviated from the target version by 5 degrees or more compared to none of 21 in the cemented group (p=0.003). There was a significant difference between the groups with regard to deviation from planned leg length (p Statistically significant reduced accuracy of cup placement is demonstrated with uncemented compared to cemented implants. It is harder to control implant positioning in uncemented implants than cemented implants.Keywords:
Bonferroni correction
Interquartile range
Cite
Inclination angle
Cite
Citations (3)
Introduction Dislocation following total hip arthroplasty THA is a major short term complication not infrequently resulting in revision arthroplasty. Malposition of the acetabular component in THA results in a higher rate of dislocation as well as increased wear and osteolysis. The aim of this study was to assess the effect of mode of fixation on positioning of the acetabular component. Patients, materials and methods For all THAs performed at our hospital in 2008, angle of acetabular inclination was measured using PACS by two independent observers. Interobserver and intraobserver reliability were assessed (Pearson9s correlation coefficient, r). We determined whether the number of acetabular components outside the target angle range (eg:45±5°) was significantly different between cemented and cementless THA (chi squared test). An enquiry was made to the National Joint Registry (NJR) in respect to incidence of revision for dislocation of THA using cemented and cementless acetabular components, 2004–2009. Results During 2008 126 THA were performed, 80 cemented and 46 cementless. There was good reliability of angle measurement (interobserver: r=0.89; intraobserver: r=0.87 and 0.97). More cemented acetabular components were within target angle range compared to cementless (cemented 32/80, cementless 29/46; chi squared=6.39, p Conclusion Positioning of the acetabular component is more difficult when using cementless systems as implant position is determined by orientation of reaming whereas with cement there is potential for fine implant position adjustment on insertion. The choice of a cementless acetabular component significantly increases the incidence of dislocation post THA. Acetabular component malposition is likely to be a factor in this increased incidence.
Osteolysis
Cite
Citations (0)
Introduction: The information in the literature about the relative merits of cemented and cementless unicompartmental knee replacement (UKR) is contradictory, with some favouring cementless fixation while others favouring cemented fixation. Cemented fixations give good survivorship but there is concern about the radiolucency which frequently develops around the tibial component. The exact cause of the occurrence of radiolucency is unknown but according to some, it may suggest suboptimal fixation. Method: Sixty-two knees (31 in each group) were randomised to receive either cemented or cementless UKR components. The components were similar except that the cementless had a porous titanium and hydroxyappatite (HA) coating. Patients were prospectively assessed by an independent observer pre-operatively and annually thereafter. The clinical assessment included Oxford Knee Score, Knee Society Scores and Tegner activity score. Fluoroscopically aligned radiographs were assessed for thickness and extent of radiolucency under the tibial implant. Results: At one year there were no differences in the clinical outcome between the groups and there were no loose components. No radiolucencies thicker than 1mm were seen. At one year none of the cementless tibias and 30% of the cemented tibias had complete radiolucencies. One out of 31 cementless (3%) and 12 out of 31 cemented (39%) had partial radiolucencies. This difference between these two groups was high significant (p Conclusions: This study clearly demonstrates that the incidence of radiolucency beneath the tibial component is influenced by component design and method of fixation. With identical designs of tibial component none of the cementless components developed complete radiolucences whereas 30% of the cemented components did. We conclude that HA achieves better bone integration than cement.
Radiodensity
Cite
Citations (0)
BACKGROUND Hybrid total hip arthroplasty (THA) commonly recognized as cementless hemi-spherical acetabular component combined with cemented femoral stem. We have done so called “reverse” hybrid THA with cemented socket and cementless stem and compared with all-cemented THAs. PATIENTS AND METHODS We have been collecting data on total hip arthroplasty since November, 1993. Reverse hybrid hip replacements were used mainly from February, 2001. We evaluated data on 272 reverse hybrid THAs (223 patients) from this year onward until May, 2010, and compared the results with those from 283 all-cemented THAs (237 patients) between 1993 and May, 2010. Eighty percent or more of patients had diagnosed as secondary osteoarthritis of the hip joint due to dysplasia in our hospitals. Highly cross linked ultrahigh molecular polyethylene (CLP) socket was introduced in October, 1999. We used conventional (not cross linked polyethylene) socket for 82 hips (cemented group-1) operated before October, 1999 and CLP socket for 201 hips (cemented group-2) in all-cemented cases. We used the Kaplan-Meier method for estimation of prosthesis survival and relative risk of revision. The endpoint was radiological loosening or revision. Socket linear wear rates were also assessed in radiographically. Clinical assessment was performed using the Japanese Orthopedic Association (JOA) scores and Merle d9Aubigne & Postel scores. RESULTS We have 12 hips (11 sockets and 1 stem) with radiological loosening in all cemented series and no hips in reverse hybrid series. A case with stem loosening in all cemented THAs had fractured stem without bony support due to massive osteolysis caused by heavy polyethylene wear. All of the loosening cases had conventional polyethylene socket and six of them were revised. Socket linear wear rates were calculated as 0.171 +/− 0.069, 0.030+/− 0.027, and 0.035+/− 0.026 mm per year for cemented group-1, group-2 and reverse hybrid cases, respectively. Clinical scores were significantly improved those at the time of final follow up compared with those of preoperative assessment. There were significant differences between conventional and cross linked polyethylene cases. We found no significant difference survival to that from cemented THR at 12 years (all cemented: 96.1% (95% CI: 92.7–99.1); reverse hybrid: 100%) (Figure 1). DISCUSSION AND CONCLUSION With a follow-up of up to 12 years, reverse hybrid THAs performed well, and similarly to all-cemented THRs from the same time period. The reason for loosening was mainly bone loss and osteolysis due to polyethylene socket wear. It is no problem if the stem was installed by cemented or cementless fixation, because the rates of stem loosening were very low in the current study. The reverse hybrid method might therefore be an alternative to all-cemented THR. Longer follow-up time is needed to evaluate whether reverse hybrid hip arthroplasty has any advantages over all-cemented THA.
Osteolysis
Harris Hip Score
Cite
Citations (0)
Background: Cemented and cementless fixations of acetabular components in total hip arthroplasty are routine practice with inherent advantages and disadvantages. The aim of our prospective randomized study was to compare the clinical and radiographic results of cementless porous-coated cobalt chromium acetabular component with cemented all-polyethylene acetabular component in total hip arthroplasty. Methods: Three hundred patients were randomized to receive a cementless hemispherical cobalt chromium porous-coated no-hole acetabular component (group 1) or cemented all-polyethylene acetabular component (group 2) with an identical cemented femoral stem and 28mm cobalt-chromium head. Patients were evaluated clinically with Harris Hip Scores (HHS) and radiographically. Analysis of both intention-to-treat groups was performed. Results: Group 1 had 128 patients (55 male, 73 female) with average age of 70.3 years. Group 2 had 147 patients (63 male, 84 female) with average age of 71.2 years. Average follow-up was 9.5 years (1.03–13.23). The median follow-up was 10 years. 25 patients were excluded from analysis for reasons including unfit for surgery (2), operation cancelled (2), missing data (8) and non-study device (10). Average preoperative HHS improved from 34.4 and 34.5 to 80 and 82.5 postoperatively in group 1 and 2 respectively. There was no statistically significant difference between the average HHS of the two groups (p=0.449) at last follow-up. There were 7 revisions in group 1 [infection (2), cup migration (2), aseptic loosening (1), slipped cup (1) and fractured liner (1)]. 11 patients had revision in group 2 [aseptic loosening (8) and recurrent dislocations (3)]. Revision rate between the two groups was not statistically significant (p=0.465). 10-year survivorship was 93.8%; and 86.6%; for group 1 and 2 respectively. No statistically significant difference was noted for prognostic factors like gender (p=0.006), body mass index (p=0.433), age (p=0.657) and surgical approach (p=0.004) for the two groups. Prognostic factors like gender (male, p=0.006) and surgical approach (posterior, p=0.004) were noted to be significant but body mass index (p=0.433) and age (p=0.657) had no statistical significance. Bootstrapping analysis for the two groups (p-value calculations N=3000) showed a significant p-value for 19 and not significant p-value for 2981 calculations. 4 porous coated cups and 29 all-polyethylene cups had radiolucencies. None of the porous-coated cups had expansile osteolysis. Conclusions: The results from our study indicate that patients with a cemented all-polyethylene cup and cementless porous coated cup have similar long term outcomes. In patients over 75 years cemented cups have excellent results (100% survivorship at 10 years).
Harris Hip Score
Cite
Citations (0)
Aim: To compare the difference in periprosthetic bone density between cemented and uncemented total hip replacement at a minimum follow up of 10 years. Patients and methods: We looked at a cohort of 17 patients who have had bilateral total hip replacement with cemented Charnley total hip on one side and uncemented Furlong total hip on the other side between 1984 and 1994 (minimum follow up 10 years). Harris and Oxford hip scores were used to determine the function, SF 36 was used to measure quality of life and Dual energy X-Ray absorptiometry (DEXA) scan was used to quantify bone mineral density adjacent to the prosthesis. The results from the DEXA scan for cemented and the uncemented hips were analysed using Paired samples two tailed t-tests. To compare the Harris hip scores, a non-parametric Wilcoxon test was used. Pearson correlations were carried out to examine the relationship between the bone density measures (averaged for each zone) and the quality of life measures. Results: Bone mineral density was higher on the Furlong side in Gruen Zones 2, 3, 5 and 6 of the proximal femur and DeLee Charnley Zone 1 of the acetabulum. In all other zones there was no statistical difference. Comparison of Harris hip scores and Oxford hip scores showed no statistically significant difference between the two hips (p = 0.108). Age is negatively correlated with bone density in Gruen zones 6 and 7 and acetabular zones 2 and 3. Conclusion: Bone density is better preserved around the uncemented HAC coated stem compared to the Charnley cemented stem.
Harris Hip Score
Dual-Energy X-ray Absorptiometry
Dual energy
Cite
Citations (0)
The clinical outcome and radiographic results of 90 cemented profile stems, 59 press-fit profile stems and 20 porous-coated profile stems implanted between October, 1987 and December, 1989 were analyzed. All total hip replacements were performed by the same group of surgeons. All used a cementless porous ingrowth acetabular component, and all femoral components were of the same geometrical design. Clinical results were evaluated using the Hip Society/SICOT/AAOS consensus format and were recorded prospectively preoperatively and at 6 months, 1 year, 2 years, 3 years and 4 years postoperatively. Radiographs were evaluated for component migration, subsidence, and cortical and cancellous biologic response as well as zonal analysis of radiolucent lines, using the Muller THR template. The functional results were similar for all three groups with no significant differences at 2 years postoperatively with respect to pain with activity, limp, or support used. However, patient satisfaction tended to be higher for cemented stems than for press-fit or porous-coated stems. Radiographic analysis showed press-fit stems to have a higher incidence (29.5%) of femoral component subsidence (mean 5.7 mm). None of the porous-coated stems subsided. Press-fit and porous-coated stems also demonstrated a higher rate of cortical hypertrophy at mid- and distal stem levels in comparison to cemented components. Press-fit application of the femoral component gives satisfactory clinical results, and the addition of proximal porous coating may confer additional advantages to the technique. Cemented stems enjoy the highest level of patient satisfaction and the most predictable objective clinical results.
Harris Hip Score
Limp
Radiodensity
Cite
Citations (6)
Cite
Citations (17)
Background Preservation of acetabular bone during primary total hip arthroplasty (THA) is important, because proper stability of cementless acetabular cup during primary THA depends largely on the amount of bone stock left after acetabular reaming. Eccentric or excessive acetabular reaming can cause soft tissue impingement, loosening, altered center of rotation, bone-to-bone impingement, intraoperative periprosthetic fracture, and other complications. Furthermore, loss of bone stock during primary THA may adversely affect subsequent revision THA. Questions/Purposes We sought to compare the conventional THA (CTHA) approach to robotic-guided THA (RGTHA) to determine which of these techniques preserves more acetabular bone, as interpreted from the size of the acetabular component compared with the size of the native femoral head. Methods Patients who received RGTHA were matched to a control group of patients who received CTHA, in terms of pre-operative native femoral head size (47.8mm – 48.1mm), age (mean 56.9), gender, BMI, and approach. Acetabular cup size relative to femoral head size was used as a surrogate for amount of bone resected. We compared the groups according to three measures describing the acetabular cup diameter ( c ) in relation to the femoral head diameter ( f ). These three measures were: ( 1 ) ( c − f ), the difference between the cup diameter and femoral head diameter, ( 2 ) ( c − f ) / f , the same difference as a fraction of the femoral head diameter, and ( 3 ) ( c3 − f3) / f3, the same ratio expressed volumetrically. Results A total of 57 matched pairs were included in each group. There were no significant differences between groups in terms of gender, age at surgery, or BMI. No differences in femoral head diameter or acetabular cup diameter were observed between groups (p > 0.05). However, measures ( 1 )( c − f ), ( 2 )( c − f ) / f , and ( 3 )( c3 − f3) / f3 did differ significantly between the groups, with lower values in the RGTHA group (p Conclusion RGTHA allowed for the use of smaller acetabular cups in relation to the patient9s femoral head size, compared to CTHA. Using acetabular cup size relative to femoral head size as a surrogate measure of acetabular bone resection, these results indicate that greater preservation of bone stock using RGTHA compared to CTHA. This may reflect increased translational precision during the reaming process. However, further studies are needed to validate the relationship between acetabular cup size and loss of bone in THA.
Cite
Citations (1)