Long-term survival of resurfacing humeral hemiarthroplasty.

INTRODUCTION: The indication for shoulder resurfacing arthroplasty is controversial, and survival of these implants is somewhat inconsistent. This study aimed to evaluate the long-term survivorship of resurfacing humeral head implants (RHHIs) and determine risk factors for complications and revisions. MATERIALS AND METHODS: This retrospective cohort study consisted of 275 cases and two types of RHHIs. The survival rate was evaluated using the Kaplan-Meier method and Cox regression for risk factor analysis. Demographic factors were studied, and the change in the humerus centre of rotation (COR) was measured. RESULTS: The mean follow-up time was 8.7 years (SD 2.7 months, range 2.8-15.9 years). The mean age of the patients was 67.6 years (SD 9.6, range 33.5-84.9). Ten-year cumulative RHHI survival was 94.1%. The cumulative estimate without any complication was 98.9% at 5 years, 80.0% at 10 years and at 15 years it was 61.5%. The most common complication was persistent pain in 13.8% of the RHHIs. The risk factors for complications and revisions were implant type, preoperative conditions and change of COR > 5 mm. CONCLUSIONS: RRHIs showed excellent long-term survival, but many complications were found. The most common complication was persistent pain, which seemed to be caused by a change of COR and was more related to one type of implant.

Incidences and Outcomes of Operatively Treated Interprosthetic Femoral Fractures Compared to Vancouver Type C and Rorabeck Type II Fractures.

BACKGROUND: This case-control study evaluated the incidences and outcomes of interprosthetic femoral fracture (IPFF) (Group I) and performed comparisons with Vancouver type C (Group II) and Rorabeck type II (Group III) periprosthetic femoral fractures (PPFF) occurring at similar anatomic sites. METHODS: A retrospective analysis was performed for all patients who had a previously implanted total hip arthroplasty (THA) and total knee arthroplasty (TKA), who lived in the hospital district and had undergone surgery due to PPFF. A total of 153 PPFFs [Group I (n = 31), Group II (n = 21), and Group III (n = 108)] were included. The annual incidences of PPFFs were summarized per 100,000 individuals. The risks of complications, reoperations, and mortalities were evaluated for all groups. RESULTS: The mean population-based annual incidence was 0.9 per 100,000 person years for Group I, 0.7 per 100,000 person years for Group II, and 3.1 per 100,000 person years for Group III. A total of 25 of 153 (16%) major complications were found and 23 of 153 (13%) cases resulted in a revision surgery. The cumulative incidence of death in Group I was 50.4% at 10 years, in Group II it was 63.8% at 10 years, and in Group III it was 74.9% at 10 years. CONCLUSION: The annual incidence of the IPFF almost doubled while the incidence of Vancouver type C stayed stable and Rorabeck type II incidence increased 5-fold. Most of the major complications occurred in IPFF group, while Rorabeck type II patients had the worst survival.

Charlson comorbidity index predicts the 10-year survivorship of the operatively treated hip fracture patients.

PURPOSE: The aim of this study was to determine how Charlson comorbidity index (CCI) predicts the 10-year survival of operatively treated hip fracture patients aged ≥ 65 years. METHODS: This retrospective cohort study included all consecutive patients who had a hip fracture and were operatively treated upon in the study period from 01 January 2007 to 31 December 2007 at the university hospital. The clinical patient data were obtained from the medical records, and CCI score was calculated. The CCI predicts the 10-year mortality for a patient who may have a range of 22 comorbid conditions. Cumulative survival and complications were evaluated in terms of gender. RESULTS: A total of 241 hip fractures were studied; of these, 183/241 (76%) were females. A total of 32/241 (15%) complications were found, of which 26/241 (11%) were considered major. Overall, 213/241 (88%) patients died during the 10 years of follow-up. Cumulative survival estimates for females were 13% at 10 years (SE = 0.3, 95% CI 3.8-4.8), and for males, it was 12% at 10 years (SE = 0.5, 95% CI 2.8-4.6) (p = 0.33). CCI was significantly associated with mortality after the hip fracture as patients with CCI scores ≥ 4 were at a 3.1-8.5 times higher risk of death compared to patients with low CCI scores of 2-3 (p < 0.001). CONCLUSION: Complications are common after operatively treated hip fracture. Advanced age, living in a care facility, ASA class 4 and high CCI score ≥ 4 were risk factors of mortality after the operatively treated hip fracture.

Survival and failure analysis of 167 medial opening wedge high tibial osteotomy with a locking titanium plate.

INTRODUCTION: This retrospective study investigated the survival rate and complications of medial opening wedge high tibial osteotomy (MOWHTO) with a precountered titanium locking plate. HYPOTHESIS: Advanced age (≥50years), gender, body mass index (BMI), type of osteotomy cut (monoplanar or biplanar), osteoarthritis (OA) grade, the use of bone grafting or substitution and preoperative hip-knee-ankle (HKA) have impact on MOWHTO survival. MATERIAL AND METHODS: A total of 167 knees (155 patients) were consecutively operated during the study period of 01.01.2006-31.12.2014. The primary outcome measure was survival without a need for revision to total knee arthroplasty (TKA). The secondary outcome was a major adverse event leading to revision surgery. Adverse events and complications were evaluated and radiological analyses were done. Furthermore, risk factors that affected the survival were analysed with the Cox regression model. RESULTS: The mean follow-up time was 7.7 (SD: 2.7, range: 0.9-14.5) years. The Kaplan-Meier estimates for the cumulative survival considering no need for TKA after MOWHTO was 90% at 5years, 78% at 10years and 61% at 14.5years (SE: 0.4, 95% CI: 11.2-12.9). The adverse event rate was 30% and 35% of the patients required a secondary surgery. The Cox regression model did not show that age, gender, weight, osteotomy type, the use of bone grafting or substitution, preoperative HKA angle or OA grade were not risk factors for conversion to arthroplasty. DISCUSSION: MOWHTO with locking plate provides good survival with no need for TKA in 78% of the knee medial OA patients at 10years of cumulative follow-up. However, a high adverse event rate (30%) is expected. Risk factors for conversion to TKA were not found and thereby hypothesis of this study was not proved. LEVEL OF EVIDENCE: VI; Retrospective cohort study.

Long-term follow-up results of medial opening wedge high tibia osteotomy with a pre-countered non-locking steel plate.

INTRODUCTION: This retrospective study investigated the long-term follow-up results of medial opening wedge high tibial osteotomy (MOWHTO) with a pre-countered non-locking steel plate implant (Puddu plate = PP) used for medial knee osteoarthrosis (OA) treatment. MATERIALS AND METHODS: Consecutive 70 MOWHTOs (66 patients) were performed between 01.01.2004 and 31.12.2008 with the mean follow-up time of 11.4 (SD 4.5; range 1.2-16.1) years. The Kaplan-Meier survival analysis was used to evaluate the cumulative survival of the implant in terms of age (< 50 years old and ≥ 50 years old) and gender. Adverse events were studied and Cox regression analysis was used to evaluate risk factors [age, gender, body mass index (BMI), preoperative mechanical axis, severity of OA, use of bone grafting or substitution and undercorrection of mechanical axis from varus to valgus] for revisions. RESULTS: The estimates for the cumulative survival with no need for TKA after MOWHTO were 86% at 5 years, 67% at 10 years and 58% at 16.1 years (SE 0.6, CI 95% 11.1-13.5). A total of 33/70 (47%) adverse events occurred and 38/70 (54%) knees required some revision surgery during the follow-up. Cox regression did not show any statistically significant risk factors for revision. CONCLUSIONS: The PP has feasible MOWHTO results with a cumulative survival of 67% at 10 years with no need for conversion to TKA. Many adverse events occurred and revision rate due to any reason was high. Age or gender did not have statistically significant differences in terms of survival.

Anterior glenohumeral instability treated with arthroscopic Bankart operation - a retrospective 5-year follow-up study.

BACKGROUND: This retrospective study investigated 5-year results of primary arthroscopic operation for anterior glenohumeral instability (AI) with special interest in patients aged<25 years and gender. HYPOTHESIS: Recurrence of AI is higher in male patients aged<25 years than older patients or females. PATIENTS AND METHODS: Primary arthroscopic Bankart repair was performed between January 2009 and December 2015 on 156 shoulders [154 patients, 104/156 (67%) males]. The mean follow-up was 5.6 (SD 2.1, range 0.4-8.9) years. Outcome measures, including re-dislocation, fear of dislocation, Western Ontario instability index, Subjective shoulder value and pain Numerical rating scale scores, the number of revision surgeries and satisfaction with the result of surgical treatment, were assessed for 130 shoulders [82/130 (63%) males]. AI recurrence was defined as a dislocation or a fear of such. RESULTS: The Kaplan-Meier analysis estimates for the cumulative survival of stable shoulders were 28% at 8.8 years for patients aged<25 years (SE 0.4, CI 95% 5.5-7.2) and 53% at 8.9 years for patients aged ≥25 years (SE 0.2, CI 95% 7.2-8.0; p=0.005). The Kaplan-Meier estimates for the cumulative survival of stable shoulders were 50% at 8.9 years for males (SE 0.3, CI 95% 6.8-7.8) and 37% at 8.6 years for females (SE 0.3, CI 95% 6.5-7.7; p=0.8). Mean time to revision was 2.4 (SD 1.7, range 0.4-5.3) years. DISCUSSION: Recurrence of AI was higher in the patients aged<25 years (p=0.005), but gender was not a risk factor. Re-operation rate due to recurrent AI was 10% in this 5-year follow-up. LEVEL OF EVIDENCE: III; case-control study.

Retrospective Population-Based Cohort Study of Incidence, Complications, and Survival of 202 Operatively Treated Periprosthetic Femoral Fractures.

BACKGROUND: The aim of this study is to investigate the population and primary total hip arthroplasty (THA)-based incidences, fracture types, complications, and survival of operatively treated periprosthetic femoral fracture (PFF). METHODS: This retrospective study reviewed 202 cases of operatively treated PFFs in a study period from January 2004 to December 2016. The Vancouver classification was used to classify PFFs. RESULTS: The incidence of PFF related to 1000 primary THAs per year was 2.7 (standard deviation 1.0, range 0.9-4.5) at a defined hospital district area during the study period. The mean population-based incidence of operatively treated PFFs raised from 1.6 to 4.5 per 100,000 person-years during the study period. The B1-type fracture was the most common fracture type in 71 of 202 (35%) of these PFFs. The cumulative incidence of re-revision was 10.9% at 1 year and 15.6% at 15 years (95% confidence interval [CI] 10.9-21.0). The cumulative incidence for other major complications was 6.4% at 1 year and 9.9% at 15 years (95% CI 5.9-15.0). The cumulative incidence of death after PFF was 7.4% at 1 year and 56.3% at 15 years (95% CI 41.3-68.8) during the follow-up time from January 1, 2004 to December 31, 2019. CONCLUSION: This country-specific study showed a 3-fold increasing trend in the incidence of operatively treated PFFs from 2004 to 2016 per 1000 THAs. The Vancouver type B1 fracture was the most common type. A high number of complications were associated with PFFs and 7.4% of the patients had died within 1 year after PFF surgery.

Health-Related Quality of Life after Hip and Knee Arthroplasty Operations.

BACKGROUND AND OBJECTIVE: The aim of this study was to investigate the health-related quality of life before and after a hip and a knee arthroplasty operation using a 15D instrument and to compare these scores to the Finnish control population 15D scores. METHODS: The pre- and post-operative data of 15D were prospective collected from the patients undergoing total hip arthroplasty or total knee arthroplasty at the Kuopio University Hospital. Post-operative data were collected at 6 and 12 months after the operation. RESULTS: The mean change of the 15D score after hip arthroplasty was +0.062 and after knee arthroplasty, it was +0.033 at the 12-month follow-up (p < 0.001). Total hip arthroplasty patients of all ages reached the control population 15D scores at the 12-month follow-up. Of the total knee arthroplasty patients, only patients aged >75 years and males aged 55-64 years did reach control population 15D scores at the 12-month follow-up. Patients experienced a statistically significant improvement in mobility, vision, sleeping, usual activities, discomfort and symptoms, distress, and vitality (p < 0.05). CONCLUSIONS: Successful hip and knee arthroplasty operations improve patients' health-related quality of life. According to this study, hip arthroplasty improves the health-related quality of life more than knee arthroplasty.

Dislocation of large-diameter head metal-on-metal total hip arthroplasty and hip resurfacing arthroplasty.

INTRODUCTION: Dislocation of large-diameter head (LDH) metal-on-metal (MoM) total hip arthroplasty (THA) or hip resurfacing arthroplasty (HRA) is a rare complication. This study aimed to determine the incidence and risk factors for dislocation of LDH MoM THAs and HRAs. METHODS: This retrospective analysis considered 4038 cementless LDH MoM THAs and HRAs, 3207 THAs in 2912 patients and 831 HRAs in 757 patients. The end of follow-up was revision due to dislocation. Incidence of dislocation was evaluated from this study population of 4038, and study groups were formed. The study was designed as a case-control study, and a threefold stratified randomised control group was formed. Demographic data were collected and radiological analyses were performed in the study groups. RESULTS: There were 26/3207 (0.8%) early dislocations in the THA group, and 6/831 (0.7%) in the HRA group ( p = 0.9). Most LDH THA dislocations occurred in a group with head size ⩽ 38 mm (18/26) ( p < 0.001). In dislocated hips, there were more dysplastic acetabula and post-traumatic hips than in the control group ( p = 0.036). In the dislocation group, the mean acetabulum component anteversion angle was 19.6° (standard deviation [SD] 13.4°) and in the control group it was 23.2° (SD 10.4°) ( p = 0.006); 7/32 (21.8%) of dislocated THAs needed revision surgery, and mean time to revision from the index surgery was 1.2 (SD 2.6) years. DISCUSSION: Dislocations occurred more often in THAs of head size ⩽ 38 mm and with a smaller anteversion angle of the acetabulum component. Hip dysplasia and post-traumatic osteoarthritis were more common in patients with dislocation.

Early aseptic loosening of cementless monoblock acetabular components.

PURPOSE: Early aseptic loosening of cementless monoblock acetabular components is a rare complication of total hip arthroplasty (THA) and hip resurfacing arthroplasty (HRA). The purpose of this study was to evaluate the incidence and risk factors for early aseptic loosening of the cementless monoblock acetabular components. METHODS: This retrospective analysis consisted of 4,043 cementless hip devices (3,209 THAs and 834 HRAs). We identified 41 patients with early aseptic loosening of the acetabular component. A control group of 123 patients without acetabular component loosening was randomly selected. The demographic data and risk factors for loosening of the acetabular component were evaluated. The mean follow-up time was 4.6 years (range, 1.7-7.8). The end-point was acetabular revision. RESULTS: The incidence of early acetabular component loosening was 1.0 %. Mean time to revision was 1.2 years (SD 1.6, range 0.0-5.4). There was significantly more Dorr type A and C acetabular morphology in patients with early loosening (P = 0.014). The loosened components were implanted to more vertical (P < 0.001) and less anteverted (P = 0.001) position than those of the control group. Presence of acetabular dysplasia or acetabular component type did not associate to early loosening. CONCLUSIONS: Acetabular morphology (Dorr type A and C) and component positioning vertically and less anteverted were more common in patients with early aseptic loosening of cementless acetabular components. Suboptimal cup position most likely reflects challenges to obtain sufficient stability during surgery. We hypothesize that errors in surgical technique are the main reason for early loosening of monoblock acetabular components.

Risk factors for intraoperative calcar fracture in cementless total hip arthroplasty.

BACKGROUND AND PURPOSE: Intraoperative periprosthetic femoral fracture is a known complication of cementless total hip arthroplasty (THA). We determined the incidence of--and risk factors for--intraoperative calcar fracture, and assessed its influence on the risk of revision. PATIENTS AND METHODS: This retrospective analysis included 3,207 cementless THAs (in 2,913 patients). 118 intraoperative calcar fractures were observed in these hips (3.7%). A control group of 118 patients/hips without calcar fractures was randomly selected. The mean follow-up was 4.2 (1.8-8.0) years. Demographic data, surgical data, type of implant, and proximal femur morphology were evaluated to determine risk factors for intraoperative calcar fracture. RESULTS: The revision rates in the calcar fracture group and the control group were 10% (95% CI: 5.9-17) and 3.4% (CI: 1.3-8.4), respectively. The revision rate directly related to intraoperative calcar fracture was 7.6%. The Hardinge approach and lower age were risk factors for calcar fracture. In the fracture group, 55 of 118 patients (47%) had at least one risk factor, while only 23 of118 patients in the control group (20%) had a risk factor (p = 0.001). Radiological analysis showed that in the calcar fracture group, there were more deviated femoral anatomies and proximal femur bone cortices were thinner. INTERPRETATION: Intraoperative calcar fracture increased the risk of revision. The Hardinge approach and lower age were risk factors for intraoperative calcar fracture. To avoid intraoperative fractures, special attention should be paid when cementless stems are used with deviant-shaped proximal femurs and with thin cortices.

Effect of locally administered zoledronic acid on injury-induced intramembranous bone regeneration and osseointegration of a titanium implant in rats.

BACKGROUND: Intramedullary implantation causes injury-induced stimulation of intramembranous bone regeneration. Intramedullary bone injury along with stress shielding may induce periimplant bone loss and cause early aseptic loosening of an implant. The aim of this study was to determine the effect of locally administered zoledronic acid on periimplant bone and injury-induced stimulation of intramembranous bone regeneration in a rat model. METHODS: A total of 28 male rats had a titanium implant inserted into their right femur. During the operation, the medullary canal was lavaged using 20 muM zoledronic acid (Zometa 4 mg/5 ml) or sodium chloride. Follow-up times were 4 and 12 weeks, with each follow-up group consisting of seven rats. The femurs with the titanium implants in situ were harvested, and three microscope sections were cut from each femur. The sections were photographed and analyzed with the Analysis computer program. RESULTS: Between 4 and 12 weeks, the length of fluorescence bone contact increased significantly in both groups (control 15.7% SD and zoledronic acid 18.8% SD), although the difference between the groups was not significant. Periimplant bone volume (thickness) was increased in the 4-week zoledronic acid group compared to the controls (+/-13.4%, P = 0.002) but at 12 weeks the groups no longer differed from each other. CONCLUSIONS: Our results suggest that zoledronic acid may prevent injury-induced bone loss near an intramedullary implant by inhibiting bone resorption shortly after implantation. This may provide better periimplant bone stock during the early postoperative period.