Highly Cross-Linked Polyethylene in Total Hip Arthroplasty in Patients Younger Than 50 Years With Osteonecrosis of the Femoral Head: A Minimum of 10 Years of Follow-Up.

BACKGROUND: Polyethylene wear and subsequent periprosthetic osteolysis remain a major concern of total hip arthroplasty (THA) failure in young, active patients with osteonecrosis of the femoral head (ONFH). The literature is lacking regarding the long-term performance of highly cross-linked polyethylene (HXLPE) in these patients. The purpose of this study is to evaluate long-term results for cementless THA using metal-on-HXLPE bearing couplings in patients younger than 50 years with ONFH. METHODS: We retrospectively evaluated the clinical and radiographic results of a consecutive series of 85 THAs (in 67 patients) performed with HXLPE liners (Durasul) in patients younger than 50 years who had ONFH. All procedures were performed at a single institution by a single surgeon using the same type of implants. The minimum duration of follow-up was 10 years (mean, 13.5 years; range, 10-17.3 years). Wear was measured using computer software. Osteolysis was evaluated with the use of radiography and computed tomography. RESULTS: The mean Harris hip score was 49.3 points (range, 26-68 points) before surgery, which improved to 93.6 points (range, 87-98 points) after surgery. Neither femoral nor acetabular components displayed mechanical loosening, and no components had been revised by the final follow-up evaluation. Radiographs and computed tomography scans did not demonstrate osteolysis. The mean liner wear was 0.037 mm/y (range, 0-0.099 mm/y). With the data available, univariate regression analysis did not demonstrate that age, sex, weight, activity level, underlying cause of osteonecrosis, liner thickness, or cup inclination had any influence on liner penetration. CONCLUSION: Although the long-term effects of HXLPE particles remain unknown, the implant survivorship rate and wear rate in our study are promising and support the continued use of metal-on-HXLPE bearing couplings in these high-risk patients because they do not produce any of the issues associated with hard-on-hard couplings. LEVEL OF EVIDENCE: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Is the pectoralis major tendon a reliable reference for restoration of humeral length with fracture hemiarthroplasty?

BACKGROUND: The primary objective was to calculate and to apply the numeric value of the distance from the pectoralis major tendon insertion to the superior aspect of the humeral head (PMTD) without any radiation exposure or equipment through basic data such as age, sex, height, and weight of Asian populations. METHODS: We analyzed shoulder magnetic resonance images of 260 patients (107 men and 153 women; average age, 59.8 years). The superior border of the pectoralis major was identified on the transverse section and cross-referenced with the coronal section. Measurements were made inferiorly from the corresponding transverse section to the top of the humeral head superiorly in coronal view. Correlation analysis was performed between variables including the patient's age, sex, height, weight, and body mass index and the PMTD by multiple linear regression analysis. RESULTS: The mean PMTD was 52 mm, with an average of 55 mm for men and 49 mm for women. Sex and height were significantly correlated with PMTD. The PMTD increased to a consistent level proportionally to height, and the difference in PMTD between men and women was 3.45 mm. An equation to estimate PMTD using these findings is as follows: PMTD (in mm) = 23 + (height [cm] × 0.17) + 3.45 (the last number is added for men). This equation had a prediction error of 0.3 mm. CONCLUSION: Our study demonstrated that PMTD is a useful and reliable reference for optimal humeral height during hemiarthroplasty for proximal humerus fractures in Asian populations.

Outcomes are equivalent for two-column acetabular fractures either with or without posterior-wall fractures.

INTRODUCTION: It is likely that posterior-wall involvement in association with two-column fractures plays a pivotal role in outcomes because of the potential for hip instability if it is not anatomically reduced and fixed. Uncertainty remains about how this fracture is best treated, especially regarding how posterior-wall involvement may affect functional results. MATERIALS AND METHODS: To better understand the role that posterior-wall involvement may play in determining functional results, we compared data for outcomes for patients with posterior-wall involvement and for those without in a consecutive series of two-column fractures. Between 2000 and 2013, 42 patients who underwent surgical treatment for two-column acetabular fractures were evaluated after a minimum follow-up period of 1 year. Data were prospectively collected and retrospectively evaluated. Of the 42 patients, 25 had only a two-column fracture (group 1) and 17 had a two-column fracture with posterior-wall involvement (group 2). RESULTS: There were no differences between groups in terms of reduction accuracy, radiographic results, clinical results, or complication rates. All hips in patients with internal fixation for the associated posterior-wall fracture had anatomical reduction. At the latest follow-up evaluation, three patients from group 1 (without posterior-wall involvement) and three patients from group 2 (with posterior-wall involvement) had undergone total hip arthroplasty. CONCLUSION: These results suggest that a posterior-wall fracture in a two-column fracture does not compromise functional outcomes when the treatment algorithm discussed here is followed.

Efficacy of interscalene block combined with multimodal pain control for postoperative analgesia after rotator cuff repair.

PURPOSE: The aim of the study reported here was to compare the efficacy and safety of postoperative analgesia provided by interscalene block with multimodal pain control (IB-MPC) versus that provided by multimodal pain control (MPC) alone after arthroscopic rotator cuff repair. METHODS: Sixty consecutive patients were assigned to either the IB-MPC group (30 patients) or the MPC group (30 patients). Visual analogue scale (VAS) pain scores before surgery and through day 5 after surgery, consumption of rescue analgesic, adverse effects and complications were evaluated. RESULTS: Mean VAS pain scores immediately after surgery and on days 1 through 5 after surgery were 3.9 ± 2.6, 4.4 ± 1.5, 3.4 ± 1.3, 2.7 ± 1.3, 2.4 ± 1.2, and 2.0 ± 1.0, respectively, in the IB-MPC group and 6.2 ± 1.8, 4.1 ± 1.7, 3.2 ± 1.9, 2.7 ± 1.4, 2.5 ± 1.3, and 2.0 ± 1.2, respectively, in the MPC group. The IB-MPC group had significantly lower VAS pain score immediately after surgery than the MPC group did (P < 0.001). There were no statistically significant differences regarding consumption of rescue analgesic or adverse effects between the two groups (n.s.). In the IB-MPC group, complications related to interscalene block included tingling of the hand in three patients and numbness of the neck and ear in two. However, these symptoms resolved spontaneously within a few days. No patients had major complications related to interscalene block. CONCLUSIONS: IB-MPC achieved better pain control immediately after surgery than MPC alone, without major complications related to interscalene block. It is an effective and safe method for providing postoperative analgesia after arthroscopic rotator cuff repair. LEVEL OF EVIDENCE: Prospective Comparative Study, Prognosis Study, Level II.

High incidence of stem loosening in association with periprosthetic femur fractures in previously well-fixed cementless grit-blasted tapered-wedge stems.

PURPOSE: Periprosthetic femur fracture is a potentially worrisome phenomenon for cementless stem fixation. The aim of this study was to document the incidence of stem loosening following periprosthetic femur fracture in previously well-fixed cementless grit-blasted tapered-wedge stems. METHODS: We identified 36 periprosthetic femur fractures of either Vancouver B1 or B2 following hip arthroplasties using cementless grit-blasted tapered-wedge titanium stems at three participating institutions (GB group). The control group consisted of 21 periprosthetic femur fractures of either Vancouver B1 or B2 following hip arthroplasties using cementless proximal porous-coated stems at the same institutions during the same period of study (PC group). All femoral stems had been in a well-fixed state before occurrence of fracture. All patients were treated surgically and femoral stem stability was assessed using preoperative radiographs and confirmed by intraoperative scrutinization. RESULTS: Seven (19.4%) of 36 fractures were Vancouver B1 and 29 (80.6%) were Vancouver B2 in the GB group, whereas 18 (85.7%) of 21 fractures were Vancouver B1 and 3 (14.3%) were Vancouver B2 in the PC group (P < 0.0001). The odds ratio for stem loosening was 24.86 (95% CI, 5.69-108.63) in the GB group versus the PC group. CONCLUSIONS: Hip arthroplasty using cementless grit-blasted tapered-wedge titanium stems showed higher incidence of stem loosening in association with periprosthetic femur fracture than hip arthroplasty conducted using proximal porous-coated stems. A high index of suspicion of stem loosening might be necessary in periprosthetic femur fracture following hip arthroplasty using this type of stems.

Detection of prefracture hip lesions in atypical subtrochanteric fracture with dual-energy x-ray absorptiometry images.

PURPOSE: To retrospectively assess how often and how early hip dual-energy x-ray absorptiometry (DXA) images show prefracture lesions in patients with atypical subtrochanteric fracture (ASF) and determine whether DXA images with assessment of prodromal symptoms could be used for early ASF prediction. MATERIALS AND METHODS: The retrospective research protocol complied with HIPAA and was institutional review board approved, with waiver of informed consent. Among 62 women with ASF, nine without hip DXA images and seven without clear documentation of prodromal symptoms were excluded. Serial DXA images of 52 hips in 46 patients were included. Among them, 33 hips were assessed with ipsilateral DXA. For this ipsilateral group, each hip was assessed for prodromal symptoms and focal cortical changes in the lateral subtrochanteric femur cortex at DXA. Overall and cumulative detection rates for prodromal symptoms, DXA, and DXA with prodromal symptoms were measured and compared with a general linear model for overall detection rate and Cox proportional hazard models for cumulative detection rate. Thirty-three representative ipsilateral images and 199 images from subjects without fractures were reviewed in random order for prefracture lesions by three musculoskeletal radiologists independently, and the performance of DXA in ASF prediction was assessed. RESULTS: Overall detection rates for DXA, prodromal symptoms, and DXA with prodromal symptoms were 61% (20 of 33), 42% (14 of 33), and 73% (24 of 33), respectively, in the ipsilateral group. Overall detection rate comparisons showed that DXA with prodromal symptoms was superior to prodromal symptoms alone (P = .0377). The cumulative detection rate curve for DXA with prodromal symptoms was also superior to that of prodromal symptoms alone (P = .0018). Sensitivity and specificity of DXA in ASF prediction ranged from 52% (17 of 33) to 58% (19 of 33) and 99% (197 of 199) to 100% (199 of 199), respectively. CONCLUSION: Assessment of hip DXA images combined with conventional assessment of prodromal symptoms enables detection of more ASFs earlier than assessment based on prodromal symptoms alone.

Revision of ceramic head fracture after third generation ceramic-on-ceramic total hip arthroplasty.

We performed 24 revisions of fractures of third generation ceramic heads. The stem was not changed in 20 revisions; a new ceramic-on-ceramic bearing was used in four and a metal-on-polyethylene bearing in 16. The stem was changed in four revisions; a new ceramic-on-ceramic bearing was used in three and a metal-on-polyethylene bearing in one. During the follow-up of 57.5 months, complications occurred in five hips among the 20 stem retained revisions: a fracture of the new ceramic head in two, metallosis with pseudocyst in two, and femoral osteolysis with stem loosening in one. However, there were no complications in the four revisions where the stem was changed. Revision surgery after ceramic head fracture shows high rates of early complications. We recommend stem revision in cases of THA failure due to fracture of a modern ceramic head.

Computed tomography-guided removal of a misplaced acetabular screw.

Open reduction and internal fixation with multiple screws and plates is the treatment of choice in patients with complex acetabular fractures. Two cases of a misplaced acetabular screw were detected on post-operative imaging, and referred to us for CT-guided removal of the misplaced screw. With the patients in the decubitus position, preliminary images were obtained to determine the puncture site and angle of approach. A k-wire was advanced to the head of the screw, over which we inserted a cannulated screwdriver and removed the screw. At each step all procedures were monitored with CT. The average total procedure time was 30 min. We observed no significant complications during or after the procedure. CT-guided removal of a misplaced acetabular screw seems to be a simple and safe procedure.

Inflammatory cytokines are overexpressed in the subacromial bursa of frozen shoulder.

BACKGROUND: Frozen shoulder is a debilitating condition characterized by gradual loss of glenohumeral motion with chronic inflammation and capsular fibrosis. Yet its pathogenesis remains largely unknown. We hypothesized that the subacromial bursa may be responsible for the pathogenesis of frozen shoulder by producing inflammatory cytokines. MATERIALS AND METHODS: We obtained joint capsules and subacromial bursae from 14 patients with idiopathic frozen shoulder and from 7 control subjects to determine the expression levels of interleukin (IL) 1α, IL-1ß, IL-6, tumor necrosis factor α (TNF-α), cyclooxygenase (COX) 1, and COX-2 by real-time reverse transcriptase-polymerase chain reaction, immunohistochemistry, and enzyme-linked immunosorbent assay. RESULTS: IL-1α, IL-1ß, TNF-α, COX-1, and COX-2 were expressed at significantly high levels in the joint capsules of the frozen shoulder group compared with those of the control group. Intriguingly, IL-1α, TNF-α, and COX-2 were also expressed at significantly high levels in the subacromial bursae of the frozen shoulder group compared with those of the control group. Immunohistochemical analysis showed increased expression of COX-2 in both the joint capsules and subacromial bursae of the frozen shoulder group. CONCLUSIONS: These findings imply that elevated levels of inflammatory cytokines in the subacromial bursa may be associated with the pathogenesis of inflammation evolving into fibrosis.

Highly cross-linked polyethylene in total hip arthroplasty for osteonecrosis of the femoral head: a minimum 5-year follow-up study.

We evaluated 162 hips with osteonecrosis of the femoral head that had undergone THA using highly cross-linked polyethylene liner after a minimum follow-up of 5 years. Neither femoral nor acetabular components displayed radiographic evidence of mechanical loosening or osteolysis, and no components had been revised at the latest follow-up. The mean rate of linear liner wear was 0.038 mm/year. Univariate regression analysis did not demonstrate that age, gender, weight, activity level or cup inclination had any influence on penetration. While the long term effects of altered mechanical properties of highly cross-linked PE remain unknown, the clinical and radiographic results at a minimum of 5 years are promising for this high-risk population.

The Validation of Two-Dimensional and Three-Dimensional Radiographic Measurements of Host Bone Coverage in Total Hip Arthroplasty for Hip Dysplasia: A Comparison with Intra-Operative Measurements.

Several methods have been introduced to measure the host bone coverage of the acetabular component after total hip arthroplasty (THA). The aims of this study were (1) to validate two-dimensional- and three-dimensional-based host bone coverage measurements by comparing intra-operative measurements, and (2) to determine the minimum host bone coverage for achieving stable cup fixation after THA in hip dysplasia. The clinical outcomes of each patient were evaluated during their final follow-up period using the Harris Hip score (HHS). The coverage of the host bone was analyzed by comparing 2D-based, 3D-based, and intraoperative assessments. The mean HHS was increased significantly from 60.84 ± 14.21 pre-operatively to 93.13 ± 4.59 (p < 0.0001). The host bone coverage ratio measured intraoperatively was 83.67 ± 3.40%, while the ratio measured by 3D CT reconstruction was 82.72 ± 3.59%. There was a strong positive correlation between the intra-operative host bone coverage and the 3D-based one (r = 0.826, p < 0.0001). It is recommended that 3D-based measurements are used to evaluate the host bone coverage after THA in patients with hip dysplasia. In addition, achieving a minimum host bone coverage of 75% is recommended for the attainment of stable cup fixation.

Is the Direct Fixation of Displaced Quadrilateral Plates in Acetabular Fractures Necessary?

Quadrilateral plate fractures represent a heterogeneous group of acetabular fractures. Accurate reduction is required to prevent post-traumatic arthritis. The purpose of this study is to determine the reduction effect of the direct fixation of quadrilateral plates in acetabular fractures, and to evaluate the strength of direct fixation compared to indirect fixation. Between 2005 and 2021, 49 patients underwent surgery for open reduction and internal fixation in acetabular fractures with severely displaced quadrilateral plates. Twenty-nine patients comprised the indirect fixation group, and twenty patients comprised the direct fixation group. In a comparison of primary outcome between two groups, 10 out of 29 indirect-group patients and 1 out of 20 direct-group patients developed post-traumatic osteoarthritis, wherein the difference between the two groups is statistically significant. In the assessment of postoperative Matta's radiological reduction status, 19 out of 20 patients in the direct group had achieved anatomical and congruent reduction. The treatment using a direct reduction and internal fixation improved the reduction quality of articular displacement and offered a better survivorship of the affected hip joint.

Anterolateral approach for mini-open rotator cuff repair.

PURPOSE: This study was undertaken to introduce an anterolateral approach for mini-open rotator cuff repair and evaluate its clinical outcome and effectiveness. METHODS: We evaluated 128 consecutive cases that were repaired by mini-open repair using an anterolateral approach. There were 80 men and 48 women, with an average age of 56.2 years. Average follow-up was 25.7 months. There were eight partial-thickness, 26 small, 40 medium, 39 large and 15 massive tears. After arthroscopic glenohumeral examination and subacromial decompression, we made a 3- to 4-cm skin incision from anterolateral edge of the acromion and dissected to the raphe between the anterior and middle deltoid. The torn tendon was repaired with single- or double-row technique using suture anchors. To prevent avulsion of the deltoid from the acromion, additional suturing within the bone tunnel was performed. We retrospectively evaluated clinical outcomes using the American Shoulder and Elbow Surgeon (ASES) scoring system. RESULTS: The average visual analogue scale (VAS), activity of daily living (ADL) and ASES scores improved, respectively, from 6.6, 12.0 and 36.7 preoperatively to 1.2, 26.6 and 88.2 postoperatively. There were 71 excellent, 39 good, ten fair and eight poor results. There were no statistically significant difference between final ASES scores and age, symptom duration, tear size or preoperative stiffness, but men had significantly higher final ASES scores than women (P = 0.014). CONCLUSION: Anterolateral approach for mini-open rotator cuff repair produces satisfactory results. It may also provide better visualisation for rotator cuff tears of all sizes.

Femoral Shaft Fracture in Klippel-Trenaunay-Weber Syndrome Patients - What to Do to Reduce Bleeding Risk: A Case Report.

A fracture of the affected extremity in patients with Klippel-Trenaunay-Weber syndrome can be fatal due to massive bleeding and show poor results. A 42-year-old male presented with an old fracture of the right femoral shaft with metal failure. We planned an operation to remove the previously fixed plate and to perform re-fixation using an intra-medullary nail. Preoperative angiography was performed and the arteriovenous malformations were embolized in order to reduce the risk of bleeding. After angiography, the previously fixed plate was removed. After the operation, a second angiography was performed immediately and the venous malformation was embolized. One week after the first operation, a second operation was performed in order to reduce the fracture and to perform re-fixation using an intramedullary nail. The patient is being followed without major complication over a period of seven years after surgery. We recommend careful planning of preoperative and postoperative angiography and embolization in order to reduce the risk of bleeding in patients with Klippel-Trenaunay-Weber syndrome.

Screw augmented cement spacer for deficient acetabulum in periprosthetic infection following Total Hip Arthroplasty.

For periprosthetic joint infection (PJI) treatment, revision total hip arthroplasty using an antibiotic loaded cement spacer is one of the important surgical methods. However, revision total hip arthroplasty using antibiotic-loaded cement spacers poses a risk of spacer dislodgement in patients with acetabular deficiency. We hypothesized that screw augmentation would be more stable and result in lower rates of cement spacer dislodgement in acetabular deficient patients. Thus, we suggest a method of screw augmentation with cement spacers to treat periprosthetic infection in patients with a deficient acetabulum. And we aim to report better clinical outcomes after revision total hip arthroplasty for infection control using screw augmented cement spacer insertion technique. Level of evidence: IV.

Multimodal approach to postoperative pain control in patients undergoing rotator cuff repair.

PURPOSE: This prospective study was undertaken to compare the effectiveness and safety of a multimodal pain control protocol with those of intravenous patient-controlled analgesia in rotator cuff repair. METHODS: Seventy patients scheduled for rotator cuff repair were randomized to either a multimodal pain control group (group 1, 40 patients) or an intravenous patient-controlled analgesia group (group 2, 30 patients). We compared these two groups with respect to level of pain before surgery to the fifth postoperative day, duration of postoperative rehabilitation, consumption of additional analgesics, and adverse effects. RESULTS: Mean visual analogue scale scores immediately after surgery (day 0) and on postoperative days 1-5 were 6.9, 5.5, 4.3, 3.3, 3.0, and 2.6 in group 1 and 7.8, 5.9, 4.4, 4.7, 4.3, and 3.7 in group 2. Pain relief was significantly better in group 1 on days 0, 3, 4, and 5 (P = 0.026, 0.006, 0.010, and 0.009, respectively). Furthermore, functional recovery occurred earlier in group 1. No significant differences were observed between the two groups with respect to nausea, vomiting, urinary retention, and headache (n.s.), but group 1 was found to be significantly less likely to experience dizziness or urticaria (P = 0.007, 0.017, respectively). One other significant difference was observed: 1 patient (2.5%) in group 1 and 6 patients (20%) in group 2 discontinued regimen because of medication-related adverse effects (P = 0.016). CONCLUSION: The multimodal pain control protocol was found to offer more effective postoperative pain control with fewer adverse effects than intravenous patient-controlled analgesia. However, achieving adequate pain control within the first 48 h of surgery remains challenging, and thus, the developments of more effective and safer multimodal pain control protocols are required.

Acetabulotrochanteric distance in slipped capital femoral epiphysis.

BACKGROUND: A pathognomonic finding of slipped capital femoral epiphysis (SCFE) is a combination of the decrease in the height of the slipped epiphysis and the position of external rotation and flexion of hip. We believe that decrease in the acetabulotrochanteric distance (ATD) on an anteroposterior (AP) radiograph represents this finding. MATERIAL AND METHODS: In a retrospective study of 25 consecutive cases of unilateral SCFE, we defined ATD as the distance between a line connecting the superolateral margins of the acetabulae with a second line, parallel to the first line, which goes through the tip of the greater trochanter on each hip and acetabulotrochanteric angle (ATA) as the angle between a line connecting the superolateral margins of the acetabulae with a second line connecting the tip of greater trochanter on each side. The difference in ATD and ATA between both hips in each case was evaluated and their correlation was determined using the Pearson correlation coefficient. RESULTS: Nineteen cases (76%) showed difference in ATD of > 2 mm and positive ATA divergence of >1 degree. The average difference in ATD was 6.6 mm (range, 0 to 25 mm); the average ATA divergence was 2.4 degree (range, 0 to 5.3 degree). CONCLUSIONS: Our findings show that the difference in acetabulotrochanteric distance (ATD) between hips is an easy, reliable, and sensitive finding present on an AP radiograph of patients with unilateral SCFE. ATD should be taken into consideration while evaluating AP radiographs of a patient suspected to have SCFE, and further evaluation with lateral hip radiographs should be carried out to confirm the diagnosis. LEVEL OF EVIDENCE: Level IV.

A prospective double-blind randomized trial on ultrasound-guided versus blind intra-articular corticosteroid injections for primary frozen shoulder.

AIMS: Ultrasound (US)-guided injections are widely used in patients with conditions of the shoulder in order to improve their accuracy. However, the clinical efficacy of US-guided injections compared with blind injections remains controversial. The aim of this study was to compare the accuracy and efficacy of US-guided compared with blind corticosteroid injections into the glenohumeral joint in patients with primary frozen shoulder (FS). METHODS: Intra-articular corticosteroid injections were administered to 90 patients primary FS, who were randomly assigned to either an US-guided (n = 45) or a blind technique (n = 45), by a shoulder specialist. Immediately after injection, fluoroscopic images were obtained to assess the accuracy of the injection. The outcome was assessed using a visual analogue scale (VAS) for pain, the American Shoulder and Elbow Surgeons (ASES) score, the subjective shoulder value (SSV) and range of movement (ROM) for all patients at the time of presentation and at three, six, and 12 weeks after injection. RESULTS: The accuracy of injection in the US and blind groups was 100% (45/45) and 71.1% (32/45), respectively; this difference was significant (p < 0.001). Both groups had significant improvements in VAS pain score, ASES score, SSV, forward flexion, abduction, external rotation, and internal rotation throughout follow-up until 12 weeks after injection (all p < 0.001). There were no significant differences between the VAS pain scores, the ASES score, the SSV and all ROMs between the two groups at the time points assessed (all p > 0.05). No injection-related adverse effects were noted in either group. CONCLUSION: We found no significant differences in pain and functional outcomes between the two groups, although an US-guided injection was associated with greater accuracy. Considering that it is both costly and time-consuming, an US-guided intra-articular injection of corticosteroid seems not always to be necessary in the treatment of FS as it gives similar outcomes as a blind injection. Cite this article: Bone Joint J 2021;103-B(2):353-359.

Progression of Asymptomatic Contralateral Femur in Patients with Complete Atypical Femoral Fracture, According to Initial Radiographic Findings.

BACKGROUND: Atypical femoral fracture (AFF) is associated with high prevalence rates of prodromal symptoms, bilateral involvement, complications, and the need for prophylactic fixation due to a risk of an impending fracture. Although most complete AFF cases have an asymptomatic contralateral femur at the initial presentation, there is lack of clarity on its progression. We evaluated the radiographic progression of asymptomatic contralateral femora in patients with a complete AFF and investigated the characteristics of these patients. METHODS: The medical records of 80 consecutive patients who had been treated for a complete AFF were retrospectively evaluated. We excluded 14 patients who had been lost to follow-up, 10 whose contralateral femur initially had been symptomatic and had been treated simultaneously, and 3 whose contralateral femur had previously been treated surgically. The remaining 53 patients were all women with an average age of 71.8 years. The average duration of bisphosphonate (BP) use was 63.6 months, and the mean follow-up duration was 48.9 months. All of the contralateral femora were asymptomatic and were divided into 2 grades according to the initial radiographic findings. We evaluated the prevalence of radiographic progression according to the grades and compared patient characteristics between the progression and non-progression groups. RESULTS: Radiographic progression was noted in 18 patients (34%) during the follow-up: 3 (12%) of 25 in grade 1 and 15 (53.6%) of 28 in grade 2 (p < 0.001). The mean time to progression for these 18 patients was 25.6 months, which also differed significantly depending on the grade (p = 0.02). Eleven and 9 (61.1% and 25.7%) of the patients received BP postoperatively in the progression and non-progression groups, respectively (p = 0.01). CONCLUSIONS: The prevalence of radiographic progression was relatively high, even though the contralateral femur was initially asymptomatic, and differed significantly according to the initial radiographic grade. The frequency of postoperative BP use was significantly higher in the progression group. LEVEL OF EVIDENCE: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Cementless total hip arthroplasty performed in patients with pigmented villonodular synovitis.

The authors retrospectively reviewed all patients with pigmented villonodular synovitis (PVNS) of the hip treated by cementless total hip arthroplasty (THA) combined with synovectomy. Eight patients were reviewed and observed for an average of 8.9 years (range, 4.3-13.5 years). Mean preoperative Harris hip scores improved from 49.3 to 96.6 points, and all patients were able to regularly perform moderate daily living activities. None of the patients had clinical or radiographic evidence of recurrent PVNS. Osteolysis occurred in 4 hips, and 2 revision surgeries were performed during follow-up. Cementless THA combined with synovectomy is an adequate therapeutic choice for patients with PVNS demonstrating end-stage joint destruction and appears to be effective at improving clinical results and preventing disease recurrence.