Introduction

Decreasing tissue damage and recovery time, while improving quality of life have been the focus of many approaches to total hip arthroplasty (THA). In this study, we compared two approaches, a tissue-sparing superior capsulotomy percutaneously assisted approach (SP) and the traditional posterior approach (TR), to address the question of whether the novel technique reduces tissue damage. The secondary aim of this study focused on the measurement technologies utilized to quantify the damage resulting from either SP or TR. Image J, BioQuant, and cellSens were the image analysis programs employed. Statistical validation and comparisons of results between all platforms were performed.

High complication rates and poor outcomes have been widely reported in patients undergoing revision of large head metal-on-metal arthroplasty. A previous study from our centre showed high rates of dislocation, nerve injury, early cup loosening and pseudotumor recurrence. After noting these issues, we implemented the following changes in surgical protocol in all large head MOM revisions: One: Use of highly porous shells in all cases. Two: Use of largest femoral head possible. Three: Low threshold for use of dual mobility and constrained liners when abductors affected or absent posterior capsule. Four: Use of ceramic head with titanium sleeve in all cases. Five: Partial resection of pseudotumor adjacent to sciatic and femoral nerves.

The purpose of the present study is to compare the new surgical protocol above to our previously reported early complications in this group of patients

We specifically looked at (1) complications including reoperations, (2) radiologic outcomes, and (3) functional outcomes. Complication rates after (Group 1), and before (Group 2) modified surgical protocol were compared using Chi-square test, assuming statistical significance p < 0 .05.

Major complications occurred in 4 (8.3%) of 48 patients who had modified surgical technique, compared to 12 (38%) of 32 revisions prior to modification (p < 0 .05). Two hips of 48 (4.17%) endured dislocations in Group 1, compared to 9 of 32 (28%) in Group 2 (p < 0 .05). Four patients of 48 had repeat revision in Group 1: 2 for recurrence of pseudotumor, 1 for dislocation, and 1 for infection, compared to 6 patients who had 7 repeat revisions of 32 patients in Group 2: 3 for acetabular loosening, 3 for dislocation, and 1 for recurrence of pseudotumor (p=0.1). None of 48 revisions in Group 1 had acetabular loosening, compared to 4 of 32 in Group 2 (p=0.02). Two patients had nerve injury in Group 2, compared to none in Group 1 (p=0.16). The mean WOMAC pain score was 87.1 of 100 and the function score was 88.4 of 100 in Group 1, compared to a mean WOMAC pain score of 78 of 100 (p=0.6) and a function score of 83 of 100 in Group 2 (p=0.8).

Modification of the surgical techniques described in the introduction has resulted in a significant decrease in complications in revision of large head MOM total hips. We continue to use this protocol and recommend it for these difficult cases.

Introduction

The optimal goal for cup positioning in hip arthroplasty in individual patients is affected by many factors including surgical exposure, femoral anteversion, and pelvic tilt. Some navigation systems ignore pelvic tilt and are based strictly on the anterior pelvic plane while others incorporate pelvic tilt, as measured in the supine position on the operating table. Neither approach incorporates knowledge of preoperative spino-pelvic flexibility or predictions of the change in spino-pelvic attitude or flexibility following surgery. While prior studies have shown little change in pelvic tilt postoperatively, one recent study based on gait analysis, suggested that changes in pelvic tilt are not predictable. The current study aims to assess changes in pelvic tilt following surgery.

Background

High complication rates and poor outcomes have been widely reported in patients undergoing revision of large head metal-on-metal arthroplasty. A previous study from our center showed high rates of dislocation, nerve injury, early cup loosening and pseudotumor recurrence. After noting these issues, we implemented the following changes in surgical protocol in all large head MOM revisions: 1. Use of highly porous shells in all cases 2. Use of largest femoral head possible 3. Low threshold for use of dual mobility and constrained liners when abductors affected or absent posterior capsule 4. Use of ceramic head with titanium sleeve in all cases 5. Partial resection of pseudotumor adjacent to sciatic and femoral nerves.

This study assesses the incidence of noise in ceramic on ceramic (COC) bearings compared to metal on polyethylene (MOP) bearings. Noise after MOP implants has rarely been studied and they never been linked to squeaking.

We have developed a noise characterising hip questionnaire and sent it along with the Oxford Hip Score (OHS) to 1000 patients; 509 respondents, 282 COC and 227 MOP; median age 63.7 (range 45–92), median follow up 2.9 years (range 6–156 months).

47 (17%) of the COC patients reported noise compared to 19 (8%) of the MOP patients (P=0.048). 9 COC and 4 MOP patients reported their hip noise as squeaking. We found the incidence of squeaking in the COC hips to be 3.2% compared to 1.8% in the MOP hips. Overall, 27% patients with noise reported avoiding recreational activities because of it and patient's with noisy hips scored on average 4 points less in the OHS (COC: P=0.04 and MOP: P =0.007).

This is the first study to report squeaking from MOP hip replacements. We therefore believe the squeaking hip phenomenon is not exclusive to hard bearings. Surprisingly, only a small proportion of patients described nose from their as a ‘squeak’. Noisy hip implants may have social implications, and patients should be aware of this. We have shown a relationship between noise and a lower OHS. However, longer follow-up and further study is needed to link noise to a poorly functioning implant.

A consecutive series of patients who underwent 113 total hip arthroplasty (THA) with minimally invasive surgery (MIS) (63 one-, 50 two-incision cases) were studied. One-incision THA was performed with a posterolateral approach. For the two-incision, the first incision for cup insertion was made over the anterolateral side of the hip and intermuscular dissection was performed between the gluteus medius and the tensor fascia lata. The second incision for stem insertion was made on the posterolateral side along the fiber of the gluteus maximus and intermuscular dissection was made between the gluteus medius and the piriformis.

The average length of the skin incision and standard deviation (SD) in the one- and two-incision group was 7.5 ± 0.54 cm and 12.1 ± 0.93 cm (p < 0.001). Average surgical time for the two groups (and SD) was 52 ± 8.5 minutes and 70 ± 10.2 minutes (p = 0.042) in the one and two incision groups respectively. Fluoroscopy was used in the two-incision group for an average 6.0 ± 5.3 seconds. In the one-incision group, the average time was 1.3 ± 2.1 seconds.

The patients in the one-incision group could walk on crutches at postoperative 3.7 days on average, and in the two-incision group at 1.6 days on average (p = 0.000). In the one-incision group, patients used crutches for 6 weeks on average, and in the two-incision group, patients used crutches for 3 weeks on average (p = 0.042).

Complications that developed within 1 month of surgery in the one-incision group were: 1 case of DVT, 1 case of intra-operative fracture and 1 case of dislocation; for the two incision group there were: 1 case of DVT, 1 case of intra-operative fracture and 1 case of femoral nerve entrapment.

Before surgery, the HHS for the one-incision group was 49.8 points, and for the two-incision group it was 49.6 points (p > 0.05). At the time of the follow up review conducted postoperatively 1 year, the average HHS was not significantly different (p > 0.05). However, the average function score in HSS for the two-incision group was superior to that of the one-incision group (p = 0.045). Preoperative WOMAC scores were not different for the two groups (68.7 in one-incision group and 70.9 in two-incision group, respectively, p > 0.05). However, the average WOMAC score for the two-incision group was better, especially for the function score (p = 0.001). The other hip functions, common in oriental persons, were also better in the two-incision group compared to the one-incision group.

On the radiographs, the location of the femoral prosthesis inserted in the medullary cavity was usually central in both groups; only 4 cases showed varus in the one-incision group and 2 cases in the two-incision group. The opening angle of the acetabular component was 38.1° in the one-incision group and 39.2° in the two-incision group (p > 0.05). The anteversion of the acetabular component was 21.0° in the one-incision group and 22.2° in two-incision group (p > 0.05).

As compared with one-incision MIS-THA, two-incision MIS-THA, although it is a more difficult procedure, produces superior results, recovery was faster and patient satisfaction was higher due to early rehabilitation and reduced soft tissue damage without increasing the complication frequency.

Introduction:

Subsidence of cementless femoral stems in total hip arthroplasty (THA) has been associated with poor initial fixation and subsequent risk of aspectic loosening. There is limited literature on how subsidence of cementless, proximally porous coated, tapered wedge femoral stems impacts the patient clinically. The aim of our study was to assess whether subsidence with these stems is associated with a decline in clinical function.

Introduction

Early rehabilitation and discharge following minimally-invasive total hip arthroplasty has potential risks including the possibility that patients may become progressively anemic at home. The current study assess the use of pre-emptive autologous blood transfusion on the length of stay, readmission, and allogenous transfusion.

Pathological conditions of the hip joint may present with variable patterns of pain referral in the lower limb. Literature reports suggest that up to 35% of total hip arthroplasties are performed on patients whose primary compliant is obturator nerve referred “knee pain”. However the effect of varied pain patterns on patient outcome and satisfaction has not previously been examined. This prospective study was undertaken to determine the most common referral patterns of hip pain in patients scheduled to undergo primary total hip replacement and to examine whether initial pain referral pattern predicted ultimate patient outcome. Patients were assessed using the Harris Hip score, SF 36 and WOMAC scoring systems measured preoperatively, at 6 months, 1 and 2 years post operatively.

236 patients were identified with isolated single hip joint disease. Patients who demonstrated multi joint disease, and particularly ipsilateral knee pathology were excluded. Forty-five percent of patients with primary hip disease had pain primarily at or about the knee. There was no difference in preoperative demographics, physical function, social function, perceived general health, Harris Hip score (p=0.74), SF 36 (p=0.66) or WOMAC scores (p=0.81) between the pain pattern groups. Operator status and operative techniques were comparable. At 1 and 2 years postoperatively the groin and thigh pain groups were similar in all respects. However at 6 months, 12 months and 2 years, Harris hip scores (p=0.04, p=0.037, p=0.021) and SF 36 scores (p=0.035, p=0.027, p=0.01) were significantly lower in those patients presenting initially with knee pain. Multivariate regression analysis confirmed that no other confounding variables could account for the observed differences between the groups. These results indicate that, using current outcome measures, patients with “knee pain” who undergo total hip arthroplasty, and in whom ipsilateral knee disease has been excluded, have poorer long-term physical and social function and perceived general health. We believe this is the first report of its kind and suggest that patient and surgeon expectations of the results of total hip arthroplasty should be tailored according to the individual initial pain referral pattern.

Introduction

The use of less invasive techniques for total hip arthroplasty (THA) has remained controversial with some studies showing a higher incidence of complications. The technique of performing total hip arthroplasty through a superior capsulotomy was developed to maximally preserve the soft tissue envelope surrounding the hip. The current study assesses the recovery and complications of hips replaced using conventional and tissue preserving techniques.

Purpose of the study: In order to evaluate the influence of prosthesis design and resurfacing on the outcome of total hip arthroplasty (THA) implanted without cement, we reviewed the orthopedic literature from 1980 to 2004.

Material and methods: The PubMed database was screened from 1980 to 2004 for publications reporting cementless THA with a follow-up analysis. The same criteria were used to screen three registries. In all, the publications retained had studied 50,162 cementless THA (mean patient age 48.9 years, mean follow-up 6.5 years) where were studied according to rate of revision, presence of osteolysis, and presence of operative fractures. Eleven families of components grouped together the majority of prostheses: five acetabular families [screw fixation without resurfacing (n=2997), screw fixation with hydroxyapatite (HA) resurfacing (n=3618), screw fixation with corindon resurfacing (2360), press-fit mac-roporous (15691), press-fit HA (6094)]; and six families of femoral pivots [straight macroprous (n=7502), straight HA (n=3255), straight corindon (n=6136), anatomic HA (n=3468), anatomic macroporous (n=1215), anatomic corindon (n=1041)].

Results: The rates of revision and of osteolysis were higher for screw fixed cups without resurfacing. For screw fixed or press-fit cups, HA resurfacing did not reduce the rate of revision compared with corindon coated or macroporous implants. For anatomic pivots, adjunction of HA resurfacing reduced the rate of revision but at the shortest follow-up and without reducing the rate of osteolysis. Corindon-coated pivots gave comparable results for straight or anatomic implants. Conversely, HA-coated pivots gave better results with an anatomic design. The shape of the pivot had les effect than resurfacing on osteolysis and revision, but had a greater influence on operative fractures (2.9% for straight implants versus 4.6% for anatomic versions).

Conclusion: In all:

uncoated implants should be abandoned;

Introduction: The debris of standard Polyethylene in Total Hip Arthroplasty (THA) has been responsible for aseptic loosing and osteolysis in many patients. Wear rates for Polyethylene-Ceramic are analysed around 10 to 20 mm3 per year, those of PE-metal even 5 times more. Dislocation of primary THA is also common and problematic. Using a PE insert with a dorsal rim lowers the risk of dislocation but could be a potential risk for impingement if not correctly placed. Aim of this study was to value of reduced risk for dislocation in terms of increased risk for impingements. Study design: Between 1989 and 2003, 1107 non-cemented SL cups with Polyethylene on Ceramic were implanted in 953 patients, 422 (44%) implanted in women. All PE inserts were with dorsal rim. Average age at implantation was 69.9 years (range 39 to 90). In all cases, a cemented stem was implanted. Of those 1107 primary THA, 100 were revised for aseptic loosening. In 11 cases both components were revised, 7 times only the cup was replaced and for the 82 revisions remaining, only the stem was revised. In all cases the PE insert was removed and replaced. All inserts were analysed macroscopically for impingement and the volume worn off was calculated. Dislocation risk of PE couplings with rim was compared to standard PE couplings without rim. Results: In 18 PE inserts of 100 with rim, signs of impingement were found, ranging from slight (considered as creep not wear) to massive. An average yearly wear rate of 43 mm^3 (range 7 to 119) was calculated. Median survival time of the inserts without impingement was 5.2 years (range 0.7 to 11.4) of those with impingement it was reduced to 4.5 years (range 1.1 to 13.8). No statistical difference calculated (Mann-Whitney-U test, p=0.28) . In 2 of all 1107 cases (0.2%) operative revision of dislocation was performed whereas in 6 of the 598 cases (1%) with PE cups without rim, operative intervention was performed. Discussion: The use of a PE insert with dislocation protection rim holds a potential danger if not correctly placed. Though an earlier failing of THA with PE impingement was found, it was not significant and overpowered by the fact that most loosenings were due to cemented titanium stems with their great potential for early loosening.

Introduction:. The incidence of heterotrophic ossification after primary total hip arthoplasty (THA) has been reported to be between 8 to 90%. The incidence is higher in lateral approach because of extensive muscular trauma associated with it. There exists limited data on the incidence of heterotrophic ossification after direct anterior approach (DAA) THA. The purpose of this study was to assess the incidence of heterotrophic ossification after THA via the direct anterior approach and the influence of surgical technique and chemoprophylaxis. Method:. A consecutive series of four hundred two primary uncemented direct anterior approach total hip arthoplasties in 378 patients were reviewed for incidence of heterotrophic ossification. In the first 200 total hip arthoplasties an anterior capsulectomy (Group 1) was done for exposure while in the subsequent 202 total hip arthoplasties a capsulotomy (Group 2) followed by complete release of supero-lateral flap of from its attachement to the gluteus minimus muscle and trochanter was performed (Figure 1). Group 1 received warfarin for thromboprophylaxis; while aspirin (thromboprophylaxis) and celecoxib (pain) was used in group 2. Heterotrophic ossification was classified according to Brooker's classification on plain radiographs. Results:. Heterotrophic ossification was significantly less in group 2 (4/202, 1.98%) as compared to group 1 (29/200, 14.5%). No severe heterotrophic ossification was found in group 2. Conclusion:. Release of the superior-lateral capsular flap from the gluteus minimus muscle allows the femoral mobilization required during the femoral preparation and exposes the trochanter for easier retractor placement and thereby minimizes the muscular traumatic insult. When combined with aspirin and celecoxib chemoprophylaxis, this technique may diminish heterotrophic ossification

Introduction. Highly cross-linked polyethylene has been introduced to decrease osteolysis secondary to polyethylene wear debris generation, but there are few long-term data on revision total hip arthroplasty using highly cross-linked polyethylene liners. The purpose of this study was to report the long-term radiographic and clinical outcomes of a highly cross-linked polyethylene liner in revision total hip arthroplasty. Materials & Methods. We analyzed 63 revision total hip arthoplasties that were performed in 63 patients using a highly cross-linked polyethylene liner between April 2000 and February 2005. Of these, nine died and four were lost to follow-up before the end of the 10-year evaluation. Thus, the final study cohort consisted of 50 patients (50 hips). There were 26 males and 24 females with a mean age at time of revision total hip arthoplasty of 53 years (range, 27–75 years). Mean duration of follow-up was 11 years (range, 10–14 years). Results. Mean Harris hip score improved from 44 points preoperatively to 85 points at final follow-up. No radiographic evidence of osteolysis was found in any hip. One hip required re-revision surgery for acetabular cup loosening at 6.5 years postoperatively. One required re-revision with a constrained liner because of recurrent dislocation. Three sustained deep infections requiring additional surgical procedures. Kaplan-Meier survivorship with an end point of re-revision for any reason was 91.0% and for aseptic cup loosening was 97.9% at 11 years (Figs. 1 and 2). Conclusions. At a minimum of 10 years, the highly cross-linked polyethylene liners showed excellent clinical performance and implant survivorship, and were not associated with osteolysis in our group of patients with revision total hip arthoplasties

The June 2015 Hip & Pelvis Roundup. 360 . looks at: neuraxial anaesthesia and large joint arthroplasty; revision total hip arthoplasty: factors associated with re-revision surgery; acetabular version and clinical outcomes in impingement surgery; hip precautions may be ineffective; implant selection and cost effectiveness; femoroacetabular impingement in the older age group; multiple revision in hip arthroplasty

Aims. Revision total hip arthroplasty is a common operation. The MP Link (Waldemar Link, Hamburg, Germany) system is a distally loading, modular, tapered femoral stem component for revision hip surgery. MP Link in revision total hip arthoplasty was investigated clinically, radiologically and with Oxford hip scores. Methods. A prospective study was conducted of 43 patients undergoing revision total hip arthroplasty with MP Link prostheses between 2004 and 2010. The patients were operated upon by one of the senior authors (JM, JS, RC). Outcome data was collected in clinic and via patient questionnaires. Results. Of the 43 patients, 18 were males. The mean age at surgery was 70.88 years (range 37–97 years). The mean follow up was 33.1 months (range 10–61 months). Indications for revision surgery ranged from aseptic loosening in 34 patients (79.1%), infection in 7 (16.3%), periprosthetic fractures in 1 (2.3%) and recurrent dislocations in 1 (2.3%). None of the patients were lost to follow up. 4 patients died with asymptomatic, well-fixed stems. 2 patients requested to have their follow up referred to their local hospital after 6 and 28 months respectively. 1 patient developed a post-operative pulmonary embolus which was treated with warfarin and caused no further problems. The average Birmingham hip score following the revision surgery was 13.5/48. 100% of the patients had osteointegration of the stem and there were no cases of loosening or osteolysis. There was no radiographic evidence of distal migration of the stems. One patient who underwent revision for infection, became re-infected and underwent further revision surgery. Kaplan-Meier survivorship was 98%. Discussion. The early to mid term results of the uncemented, modular femoral MP link prosthesis are encouraging in complex revision total hip arthoplasty. Long term results are awaited

The use of total hip arthroplasty in adolescents for end-stage degenerative hip disease is controversial with few reported outcomes in the literature. The purpose of the study was to report the outcomes of total hip arthroplasty in a cohort of adolescents managed by a multidisciplinary team of paediatric and adult orthopaedic surgeons from a single centre. A multidisciplinary clinic consisting of paediatric and adult hip surgeons was established in 2013 to identify, treat and prospectively follow adolescents who would potentially beneift from a total hip arthoplasty. To date 29 consecutive adolescent patients (20 female, 9 male, 32 hips) with end stage degenerative hip disease have undergone cementless primary total hip arthroplasty. Mean age at decision to treat was 15.7 years (age 11.4–18.5). Ten different underlying paediatric specific pathologies were documented including DDH, cerebral palsy, JIA, skeletal dysplasias, SCFE and idiopathic chondrolysis. Three patients had bilateral staged procedures. Clinical baseline and outcomes were measured using Oxford Hip Score (OHS), WOMAC score and ASKp scores. Radiographic follow-up was conducted at 6 weeks, 6 months and yearly thereafter. Post-operative complications were recorded. Twenty-five hips were eligible for minimum 2-year follow-up scoring at a mean 2.7 years (2.0–3.6 years). No intraoperative complications occurred. One case of recalcitrant postoperative psoas tendonitis occured. OHS improved from 25 (7–43) to 41 (23–48). WOMAC improved from 48 (12–8) to 12 (1–44), and ASKp improved from 78% (33–98%) to 93% (73–100%). Radiographic review revealed acceptable alignment of all components with no signs of loosening or wear. No revision of components was required. One patient died at 6 months post op from an unrelated condition. The early term results of total hip arthroplasty in adolescents from our multidisciplinary program are encouraging. Improvements in quality of life to normal values were seen as were hip scores consistent with satisfactory joint function. Depite the range of complex and varied causes of arthritis seen in this population the establishment of combined paediatric and adult orthopaedic surgical teams appears to be a successful model to manage end-stage degenerative hip disease in adolescents

Introduction. In most cases of revision acetabular total hip arthoplasty (THA), some degree of bone loss will be accompanied. If the bone loss is massive, the management of bone defect is more challenging problem. We consider that using cementless accetabular cup for revision acetabular reconstruction is good indication when stable interface fit between the acetabular cup and bone is achieved. The purpose of this study is to review the result of revision hip arthroplasty using cementless acetabular cup with and without bone graft. Materials and methods. Between 1998 and 2012, 65 revisions using cementless acetabular cup (Mallory-Head 4 Finned component) were performed in 64 patients, whose mean age was 64.9 years. The cases of revision are aseptic loosening (53 joints), and infection (12 joints). All patients were followed up for a minimum period of 24.0 months (mean, 84 months) and were divided into two groups as follows: in group A, revisions without bone graft (28 joints); in group B, revisions with bone graft (37 joints). We compared clinical and radiographical results of group A with group B. Results. According to Paproski's classification, bone defects in Group A were evaluated as either Type I or Type IIa, and those in Group B were in the range of Type IIb to Type IIIb. Large cementless accetablar compornent with diameters of 58 mm or more were used in 6 joints and 21 cases, respectively. Postoperative radiography showed there were no significant deference of the position of hip center, lateral inclination and anteversion of acetabular cup in each group. The migration of the socket in the superior and medialaxes has not been observed in all cases at the latest follow-up. The mean JOA hip score improved from 63.1 points to 88.3 points and from 53.2 to 86.1, respectively and there were no cases of re-revisions in this series. Conclusions. Depending on the bone defect, large cementless accetablar compornent and bone graft should be considered. We are confident that results of acetabular reconstraction using cementless acetabular cup are satisfactory

Fracture of the acetabulum can lead to degenerative arthritis of the hip, avascular necrosis of the femoral head, or both. Total hip arthroplasty is a common form of surgical treatment when significant joint changes and pain are present. Ten patients with fracture acetabulum were treated in this study using metal on metal total hip arthoplasty. The initial fracture was posterior wall fracture in one patient, posterior column fracture in one patient, transverse fracture in 2 patients, fracture dislocation in 3 patients and fracture posterior wall and column in 3 patients. The indications of arthroplasty were secondry osteoarthritis after internal fixation or after conservative management or collapse of the femoral head. Arthroplasty was done after an average period of 1.8 years (range from 1 to 4 years). After a follow up period ranged from 3 to 7 years with a mean of 4.6 years, the Harris hip score was improved from a mean of 51 (range 20 to 65) to a mean of 92.5 (range 90 to 95). Infection occurred in one case and two stages revision was done. Another case developed loosening of the acetabular component and was revised using cementless cup fixed with screws and bone graft. Metal on metal THR after acetabular fracture are relatively uncomplicated and lead to a good outcome despite the difficulties faced during the procedure

Purpose: There is no report concerning about long-term comparison result of high placed cementless cup stability with or without screws for developmental dysplasia of the hip. The aim of this study was to ascertain whether or not there are any differences in high placed cementless cup stability with or without screws at the mean 10-year (6–14) follow-up period. Method: We divided 109 hip-cases who underwent identical cementless total hip arthoplasty system (Mallory – Head : Biomet Inc.) to two groups: 57 cups with screw (screw group) and 52 cups without screw (no screw group). No case in both group underwent bulk bone graft for acetabular roof. Radiographic signs of cup instability were defined as the development of radiolucent line (> 2mm) or migration (> 4mm). Degree of subluxation by Crowe classification, cup size and cup abduction angle were also measured. Results: In both groups, there was no significant difference in terms of degree of subluxation (each grade’s %) (screw vs no screw = I (68, 73), II (21, 25), III (11,0), IV (0, 2)), age (yrs) (58, 60), cup size (mm) (46, 47) and cup abduction angle (49, 47). In screw group, one case was revised by replacing only polyethylene insert due to excessive ware. No case in both group showed any sign of component instability. Conclusion: High placed Mallory-Head type cementless cup without screws showed stable radiographic fixation as well as cup with screws at mean 10 years follow-up period