Birmingham Hip resurfacings have been a popular mode of treatment for younger and more active patients with arthritis of the hip. However the use of hybrid hip arthroplasty system with a Birmingham hip resurfacing cup and modular head with a variety of cemented/uncemented stems is less well described in the literature. We analysed radiographic and clinical outcomes of 99 consecutive hybrid hip arthroplasties performed by a single surgeon between 2000 and 2006. A total of 93 patients (52 females and 41 males) with an average age of 69.9 (47 to 88) and average BMI of 28.8 (18.7 to 140.9) had arthroplasties with a mean follow up of 4.1 Yrs (1 to 6.3 years). 57 right and 42 left hip arthroplasties were performed of which 6 patients had bilateral consecutive hybrid hip arthroplasties. 93 were performed for osteoarthritis, 4 for RA, 5 patients for revision of failed hip resurfacing arthroplasties with #NOF and 1 revision for failed THR. No patients had dislocations and one patient had revision of a resurfacing cup secondary to hip pain due to excessive cup anteversion, no loosening of components were identified at the most recent follow-up and all patients were mobilising well with no complaints of pain. Hip Resurfacing procedures are gaining popularity in the younger individuals with arthrosis of the hip. Some patients who are fairly independent and active fall short of satisfying the criteria for a hip resurfacing and we preferred the option of the Birmingham hip resurfacing cup with a large modular head and a compliment of stems. This metal-on-metal option with large heads would ideally increase stability and reduce wear patterns with the prospect of increasing longevity of total hip arthroplasties

When the Birmingham Hip Resurfacing (BHR) metal-on-metal implant system was approved by the United States Food and Drug Administration in 2006, a multicenter, prospective, post-approval study (PAS) was required. This study uses data from the PAS to investigate metal level and glomerular filtration rate (GFR) trends over the first decade in vivo. Between October 2006 and March 2011, 290 primary BHR procedures were performed among 262 patients at 5 sites. Whole blood samples were sent to a single specialized laboratory to determine GFR, cobalt (Co) and chromium (Cr) levels. The population for this study consists of 117 unrevised unilateral patients with a mean age at surgery of 51.3±6.5 years who had pre-operative, 1-year, 4-year, 5-year and 10-year laboratory data. The mean follow-up for these patients that included 36 females was 10.1±0.2 years. Median metal levels at 1-year increased relative to pre-operative values for Co (by a factor of 9.7 from 0.13 to 1.26 ppb, p<0.001) and Cr (by a factor of 2.5 from 0. 60 to 1.50 ppb, p<0.001). Metal levels subsequently remained relatively constant over time with a median 10-year value of 1.12 ppb for Co and 1.29 ppb for Cr. Based on 585 blood samples from all 117 patients, there was no relationship between GFR and Co (. →. =−0.06, p=0.14) or Cr (. →. =0.05, p=0.27) levels. However, lower pre-operative GFR values were associated with larger increases in Co at 1-year relative to the pre-operative level (. →. =−0.26, p=0.005). There was no relationship between pre-operative GFR values and changes in Cr at 1 year (. →. =−0.13, p=0.15). Through the first decade in vivo, elevated whole blood metal levels for unilateral BHR patients do not appear to adversely affect GFR. However, patients with lower pre-operative GFR values tend to have larger increases in their Co level at 1-year

Aims. The aim of this study was to assess the functional gain achieved following hip resurfacing arthroplasty (HRA). Patients and Methods. A total of 28 patients (23 male, five female; mean age, 56 years (25 to 73)) awaiting Birmingham HRA volunteered for this prospective gait study, with an age-matched control group of 26 healthy adults (16 male, ten female; mean age, 56 years (33 to 84)). The Oxford Hip Score (OHS) and gait analysis using an instrumented treadmill were used preoperatively and more than two years postoperatively to measure the functional change attributable to the intervention. Results. The mean OHS improved significantly from 27 to 46 points (p < 0.001) at a mean of 29 months (12 to 60) after HRA. The mean metal ion levels at a mean 32 months (13 to 60) postoperatively were 1.71 (0.77 to 4.83) µg/l (ppb) and 1.77 (0.68 to 4.16) µg/l (ppb) for cobalt and chromium, respectively. When compared with healthy controls, preoperative patients overloaded the contralateral good hip, limping significantly. After HRA, patients walked at high speeds, with symmetrical gait, statistically indistinguishable from healthy controls over almost all characteristics. The control group could only be distinguished by an increased push-off force at higher speeds, which may reflect the operative approach. Conclusion. Patients undergoing HRA improved their preoperative gait pattern of a significant limp to a symmetrical gait at high speeds and on inclines, almost indistinguishable from normal controls. HRA with an approved device offers substantial functional gains, almost indistinguishable from healthy controls. Cite this article: Bone Joint J 2019;101-B:1423–1430

Femoral neck fracture is a recognised complication of Birmingham Hip Resurfacing. But stress fracture is uncommon. Femoral neck stress fractures are one of the most difficult problems to diagnose. The pain associated with a femoral neck stress fracture often is localized poorly and may be referred to the thigh or back. We present a young fit gentleman who underwent Birmingham Hip resurfacing for Osteoarthritis Hip. He underwent Birmingham Hip Resurfacing Right side with satisfactory post-operative x-rays and progress. He presented for the Left side Birmingham Hip Resurfacing. X-rays revealed a stress fracture through the femoral neck. Patient was asymptomatic and refused any surgical intervention. Patient successfully underwent Birmingham Hip Resurfacing Left side. The Right stress fracture neck of femur healed in varus without any further complications. The patient is asymptomatic after 30 months of diagnosis. We conclude that expectant treatment has role in asymptomatic stress fracture following Birmingham Hip resurfacing

A concern of metal on metal hip resurfacing arthroplasty is long term exposure to Cobalt (Co) and Chromium (CR) wear debris from the bearing. This study compares whole blood metal ion levels from patients drawn at one-year following Birmingham Hip Resurfacing (BHR) to levels taken at a minimum 10-year follow-up. A retrospective chart review was conducted to identify all patients who underwent a BHR for osteoarthritis with a minimum 10-year follow-up. Whole blood metal ion levels were drawn at final follow-up in June 2019. These results were compared to values from patients with one-year metal ion levels. Of the 211 patients who received a BHR, 71 patients (54 males and 17 females) had long term metal ion levels assessed (mean follow-up 12.7 +/− 1.4 years). The mean Co and Cr levels for patients with unilateral BHRs (43 males and 13 females) were 3.12 ± 6.31 ug/L and 2.62 ± 2.69 ug/L, respectively, and 2.78 ± 1.02 ug/L and 1.83 ± 0.65 ug/L for patients with bilateral BHRs (11 males and 4 females). Thirty-five patients (27 male and 8 female) had metal-ion levels tested at one-year postoperatively. The mean changes in Co and Cr levels were 2.29 ug/l (p = 0.0919) and 0.57 (p = 0.1612), respectively, at one year compared to long-term. These changes were not statistically significant. This study reveals that whole blood metal ion levels do not change significantly when comparing one-year and ten-year Co and Cr levels. These ion levels appear to reach a steady state at one year. Our results also suggest that regular metal-ion testing as per current Medicines and Healthcare products Regulatory Agency (MHRA) guidelines may be impractical for asymptomatic patients. Metal-ion levels, in and of themselves, may in fact possess little utility in determining the risk of failure and should be paired with radiographic and clinical findings to determine the need for revision

We previously reported the five to ten-year results of the Birmingham Hip Resurfacing (BHR) implant. The purpose of this study was to evaluate the survivorship, radiographic results, and clinical outcomes of the BHR at long-term follow-up. We retrospectively reviewed 250 patients from the original cohort of 324 BHRs performed from 2006 to 2013 who met contemporary BHR indications. Of these, 4 patients died and 4 withdrew. From the 242 patients, 224 patients (93%) were available for analysis. Modified Harris hip score (mHHS) and University of California, Los Angeles (UCLA) scores were collected and compared to a matched total hip arthroplasty (THA) cohort. Mean follow-up was 14 years. Survivorship free of aseptic revision was 97.4% and survivorship free of any revision was 96.0% at 15 years. Revisions included 3 periprosthetic joint infections, 2 for elevated metal ions and symptomatic pseudotumor, 2 for aseptic femoral loosening, and 1 for unexplained pain. The mean mHHS was 93 in BHR patients at final follow-up, similar to the THA cohort (p=0.44). The UCLA score was significantly higher for BHR patients (p=0.02), however there were equal proportions of patients who remained highly active (UCLA 9 or 10) in both groups, 60.5% and 52.2% (p=0.45) for BHR and THA respectively. Metal ion levels at long term follow-up were low (mean serum cobalt 1.8±1.5 ppb and mean serum chromium 2.2±2.0 ppb). BHR demonstrated excellent survivorship in males less than 60 years of age at time of surgery. Clinical outcomes and activity levels were similar to THA patients. Failures related to the metal-on-metal bearing were rare and metal levels were low at long-term follow-up. Level of evidence: III. Keywords: survivorship; hip arthroplasty; activity; metal-on-metal. Surface Replacement Arthroplasty demonstrates low revision rates and similar activity level compared to total hip arthroplasty at long-term follow-up

We present a consecutive case cohort of the first 100 Birmingham Hip Resurfacing (BHR)'s in 90 patients with a minimum follow up of 20 years. All procedures were performed by a single surgeon having commenced the study in 1998. The original cohort included 68 males with 75 hips (7 bilateral) and 22 females with 25 hips (3 bilateral). The mean age at index procedure was 52. Patients were recalled to review in clinic as per Medicines and Healthcare products Regulatory Agency guidelines with x-rays, metal ions and Harris Hip Scores recorded. After a minimum of 20 year follow-up review the known overall revision rate is 11%. 11 have died and 7 have been lost to review. In males the known revision rate is 4/75 (5%), 3 of which were due to early fractures and 1 revision for infection at 5 years. The known revision rate in females is 7/25 (28%) of which 6 were due to adverse reactions to metal debris; 3 at 7–8 yrs, 1 at 15 yrs, 2 at 18 years, and 1 at 2 months for avascular necrosis. The mean 20 year metal ions results were cobalt 36.6 nmol/l (range 7.4–232.1) and chromium 32.1 nmol/l (range 6–120.8). The mean Harris hip score was 88.5 (range 38.6–99.8). This case series with 20 years follow-up demonstrates excellent long term survival of the BHRs further to registry BHR data and similar to THR for same age recipients. Applying today's strict criteria for patient selection would likely improve survival rate further. BHR has not demonstrated the catastrophic revision rates associated with some metal-on-metal resurfacing and remains a safe option for those who meet the criteria

Purpose: To find the incidence of Periprosthitic fracture following Birmingham Hip Resurfacing over the age of 65 yrs – in Ashford & St. Peters Hospitals. Method: We have done an audit to study the total number of patients who had Femoral neck fractures following Birmingham Hip Resurfacing, comparing them with the incidence of Femoral neck fracture in the age group of 65 yrs & above, from the period of March 2000 to January 2006 in Ashford & St. Peters Hospitals (NHS & Private). Between March 2000 and January 2006, 327 Birmingham hips were inserted by 8 surgeons. Fracture of the neck of the femur occurred in 5 patients, an incidence of 1.53%. Results:. 1 Intra op fracture & 4 post op fractures. Out of the total number of patients, 131 were above the age of 65years, with mean age of 68.80 years & a range of 65–77 years. No Femoral neck fractures were found in this age group. Conclusion: Incidence of Femoral neck fracture is NIL in the age group of 65 yrs & above compared to 1.53% over all

To review the early functional results of Birmingham hip resurfacing. First 116 hips (98 patients), a cohort of consecutive patients prospectively underwent BHR in a single arthroplasty Surgeon’s practice in a University Hospital outside Birmingham. Inclusion criteria fit and active patients. 98 patients mean age 50 years (range 19–67). Pathology OA 85%, Perthes 7%, DDH 4.7% & SUFE 2%. Mean follow-up 30 months (range 12–45). Scoring systems used were Harris hip score (HHS), WOMAC & SF36. HHS: mean pre-arthroplasty 47 (range 10–73), one year 99 (n=57), at 2 years 97.3 (n=26) and at third year 100 (n=3), statistically significant improvement (P=0.001). WOMAC: pain: pre-op score 18.8, at 1 year 5.6 and second year 5.7. Stiffness: pre-op 8.5, 1 year 2.7 & 2. nd. year 2.7. Physical: 49.3, 1 year 23.4 & 2. nd. year 22.6. This shows a statistically significant improvement in pain score (p=0.025) and physical function score (p=0.025). SF-36 one-year post op, when analysed against an age/sex match control group normal values using a 2 tailed ‘t’ Test, seven of the eight domains showed no statistical significance. Only the Social Functioning domain showed a statistically significant result (p=0.011). One fracture following a fall (patient had deep cysts in proximal head now such patients are not offered BHR), one dislocation following RTA and one AVN in a 50 years old post menopausal lady. Birmingham hip resurfacing can provide excellent level of activity and patient satisfaction. A long-term study is needed to evaluate the long-term benefit and survivorship

Purpose of study. This study is to determine the survival and outcomes of the Birmingham Interlocking Triple Pelvic Osteotomy. A dysplastic hip predisposes to early arthritis. The Triple Pelvic Osteotomy (TPO) is a joint-preserving option for the treatment of young adults with hip dysplasia. The long term success of the procedure is not known. Patients and methods. The senior author has been performing Birmingham Interlocking Triple Pelvic Osteotomies for 18 years. The outcomes of the first 100 patients (117 TPOs) were reviewed using postal questionnaires, telephone interviews and radiograph review. The primary outcome measure of the study was the Kaplan—Meier survival curve for the TPO. Hip replacement or resurfacing were taken as failure points. The Oxford Hip Score (OHS) and University of California, Los Angeles (UCLA) score were used as secondary outcome measures for the surviving osteotomies. The pre-and post-operative acetabular index and centre-edge angles were measured from surviving radiographs. Results. Follow-up was 93% for survivorship. The mean age at operation was 31 years (range of 7 to 57 years). The mean pre- and post-operative centre-edge angles were 19°and 50° and acetabular indices were 23° and 2°. The Kaplan-Meier survival curve demonstrates that the 10, 15 and 18-year survival rates are 76%, 57% and 50% respectively. Survival was 89% if the osteotomy was performed before 20 years of age. The median UCLA score was five (inter-quartile range three to seven). Median OHS was 41 (inter-quartile range 24 to 46). The UCLA and OHSs show that those with surviving osteotomies tend to have good hip function. Conclusions. The Birmingham Interlocking Pelvic Osteotomy provides a valuable tool to preserve dysplastic hip function and delay arthroplasty surgery, particularly in the younger patient. It is best performed early before arthritis sets in

Introduction. In the early 2000s hip resurfacing became an established bone conserving hip arthroplasty option particularly for the fit and active patient cohort. The performance of second-generation metal-on-metal bearings had led to the reintroduction of hip resurfacing. The Birmingham Hip resurfacing (BHR) was introduced in 1997. This was followed by a number of different designs of the hip resurfacing. The Durom hip resurfacing was introduced in 2001. These two designs had different metallurgical properties, design parameters particularly clearance and different implantation techniques. Data from joint registries show that both prosthesis perform well. Objectives. Our objective was to perform a retrospective survival analysis comparing the Birmingham to the Durom hip resurfacing and analyse the mode of failures of the cases revised. Methods. Data was collected prospectively but analysed retrospectively. The two cohorts comprised patients treated by two senior surgeons at different units. The follow up range was 1 to 14 years with a mean of 10 years. The end-point was revision for any cause. However this was further substratified. Results. The outcome of all patients was known. The two cohorts exhibited no significant difference in demographics. No failures in either cohort were attributed to adverse reaction to metal debris. Revision for any cause was analysed by plotting Kaplan-Meier Survival curves. The Durom cohort (n=273) had 5 deaths and 9 revisions. The Birmingham cohort (n=567) had 5 deaths and 22 revisions. The Kaplan-Meier survival curves for the two resurfacing designs were different. The Durom cohort demonstrated a concave curve with more early failures. This was contrary to the BHR's convex curve with higher incidence of late failures. We analysed the data by substratifying into failure of femoral or acetabular component and neck fractures. Conclusions. The Kaplan-Meier survival analysis demonstrates that the Durom hip resurfacings had a higher rate of early failure. However extrapolation of the curves suggests that the Durom may have a superior long term survival compared to the BHR. We postulate that this may be due to the femoral implantation technique with less late failures in Duroms and an apparent acceleration of failures in BHR cohort around the ten year stage. Joint registry data also reflect this pattern

The purpose of this study is to show our experience with Birmingham Hip Resurfacing which we think it is a procedure that will play a big role in hip replacement surgery, especially for young people. Methods:. Operative Records from the Theatre Registrar Book, Implant register Book and the theatre computer records. Other similar studies from other Hospitals. Birmingham Hip Resurfacing – Ashford and St. Peter’s Hospitals Experience for the period March 2000 to January 2004. The total number of cases done for the period: 290. The number of patients: 277. Male: 160. Female: 130. Right Hip: 145. Left Hip: 120. Side not recorded: 25. Both sides done: 13. Primary cases: 286. Revisions: 4. The youngest male done aged: 25 years. The youngest female done aged: 33 years. The oldest male done aged: 75 years. The oldest female done aged: 72 years. Mean age: 56.5 years. Conclusion: Birmingham Metal on Metal Resurfacing started by Mr. Derek McMinn at about 13 years ago. Our results and results world-wide are encouraging. The failure rate of THR in young patients is very high, and the revision is difficult and requires a major reconstructive operation. Therefore BHR is a good alternative in our opinion

Modern Metal on Metal hip resurfacing originated from Birmingham in the early 1990’s and is now well estabilished in the U.K. This procdure is gaining acceptance in other parts of the world and is now being performed in many countries in the Asia Pacific region including Australia and India.The demographics of the patient population with hip arthritis in south Asia and western europe is very contrasting. Primary osteoarthritis of the hip is virtually non-existent in the Indian subcontinent wheras it is by far the commonest hip disorder in Europe.Sixty nine percent of patients had primary osteoarthritis as the presenting pathology in the pilot series of metal on metal hip resurfacings from Birmingham. Most patiens in India with hip arthritis are very young and have developed secondary degenerative in the joint due to other specific causes. Thus procedures like the Birminham hip resurfacing which addresses the difficult problem of hip arthritis in the young active adult have a greater role to play in this

Introduction: The Birmingham Hip Resurfacing (BHR) system comprises both a BHR femoral head and a large modular femoral head for use should a total hip replacement be required. The modular femoral head has identical material chemistry, microstructure, spherical form, and surface roughness of the bearing surfaces of resurfacing femoral head and both BHR and THR devices share the same acetabular components. Hence, if the femoral component of a BHR needs revision surgery, the Birmingham hip system provides the potential of converting it to a THR without the need to also revise the well fixed cup. Although it stands to reason that the wear behaviour of the BHR and Birmingham THR will be similar, it is important to investigate the wear behaviour of new THR modular heads against worn BHR cups, representing revision of BHR to Birmingham THR without cup revision. The aim of this study is to assess the viability of the femoral component revision for BHR devices whilst leaving the acetabular components in situ in the pelvis. Materials and Methods: The wear and friction tests were conducted with pristine modular heads paired with BHR cups which had already undergone 5 million cycles (Mc) of wear in a hip simulator against BHR heads. Results and Discussions: The average wear rate of the new Birmingham THR modular heads against worn cups was 0.42 mm. 3. /Mc whilst the new BHR heads against new cups generated wear rate of 0.67 mm. 3. /Mc. Supported by the friction test results, it indicated that the new femoral heads paired with worn cup did not negatively affect the substantial amount of fluid-film lubrication that had developed over the course of the original test. Therefore, it is acceptable to use new femoral heads against worn cups, if the cups are not damaged, well fixed and correctly orientated

Introduction: Femoral neck failure due to avascular necrosis (AVN) is one of the most significant complications following resurfacing hip arthroplasty. It is likely that the surgical approach is one of the factors influenc-ing the development of AVN. Positron emission tomography (PET) is the only form of imaging that allows visualisation of bone metabolic activity deep to a metal surface. Objectives: To establish the reliability and accuracy of PET using fluorine-18 to evaluate viability of the femoral head and neck after resurfacing hip arthroplasty. To assess the viability of ten proximal femora after Birmingham resurfacing hip arthroplasty via a modified lateral approach. Design: A convenience case series of ten patients taken from the first fifteen from one orthopaedic surgeon’s experience of Birmingham resurfacing hip arthroplasty. Setting: The PET unit of a major urban teaching hospital with a large academic orthopaedic department. Participants: Patients that had undergone unilateral Birmingham resurfacing hip arthroplasty via a modified lateral approach were asked to volunteer for the study. The main criterion for inclusion was ease of attendance for imaging. Intervention: Participants were given a single intravenous dose of 250MBq fluorine-18. After a period of 40 minutes uptake time, PET images of adjacent, sequential 10cm transverse sections including both acetabulae and proximal femora were obtained. Main Outcome Measures: Images were reconstructed to allow relative quantification of uptake between operated and non-operated femoral heads and necks. Results: PET imaging was successful in all subjects and demonstrated activity within the resurfaced femoral heads and femoral necks. No evidence of AVN was found. Conclusions: Static positron emission tomography using fluorine-18 is an accurate and reliable method of assessing femoral head and neck viability after resurfacing hip arthroplasty. No evidence of avascular necrosis was found in this initial series of patients that had undergone Birmingham resurfacing hip arthroplasty via a modified lateral approach

Introduction: Hip Resurfacing has always been an attractive concept for the treatment of hip arthritis in young patients. Excellent early and medium-term results have been reported with the Birmingham Hip Resurfacing (BHR) device in single and multi-surgeon all-diagnoses and OA series. In the present report we present the results of BHR in inflammatory arthritis. Methods: This is a single-surgeon consecutive series. There were 15 consecutive hips (12 patients) including 2 women (2 hips) with ankylosing spondylitis (AS) operated at a mean age of 41.7 years (range 29.5 to 54.3 years). Fortytwo hips (31 patients) with seronegative or rheumatoid (RA) arthritis treated with a BHR at a mean age of 40 (13 to 64) years and a follow-up of 2 to 9 (mean 5.9) years were also studied. One patient died 5 years later. Revision for any reason was the end-point and unrevised patients were assessed with Oxford hip scores and reviewed clinico-radiologically with AP and lateral radiographs. Results: In the RA group there was one failure from femoral neck fracture two months after operation giving a failure rate of 2.4%. There were no failures in this cohort at a follow-up of 1.8 to 8.8 (mean 4.9) years. As a combined group the failure rate of BHRs in inflammatory arthritis is 1.75% and the cumulative survivorship at 9 years is 98.2% (figure). Discussion: The good results of Birmingham Hip Resurfacing in inflammatory arthritis in this relatively young cohort of patients make this a viable treatment option for these patients. Selection of patients with a reason-able bone quality and adherence to precise operative technique are vital to the success of this procedure

Introduction: The Birmingham Hip resurfacing was commercially introduced in 1997 and early originating centre series show good functional outcomes. Concerns have been raised over the longevity, functional outcomes and metal ion release from the implants. There are no series of medium term results from an independent district general hospital reported in the literature. We present a prospective series of 100 patients with mean 5 year follow up from a district general hospital. Each patient underwent yearly clinical, hip scoring, and regular radiographic evaluation. Radiographic analysis was undertaken using Harris’, Hodgkinson’s and Amstutz’s criteria, evaluation of component position, neck narrowing and migration using diagnostic PACS workstations with standardised scaled images. Results: Between June 2001 and Feb 2004 100 Birmingham Hip replacements were performed by two consultant surgeons (MP, AA). Mean follow up is 61.2 months (range 38–76 months). Harris hip scores (fig 1) improved from 46 pre-operatively to 90 post-operatively and no significant change over the next five years. There were no revisions in this period. Obese patients (BMI> 30) had a significantly (p< 0.03) lower post operative functional score as compared normal patients. No other factors were significant for outcome. Component position was satisfactory in 93% of cases. Radiographic analysis showed no cups, or stems were definitely loose. Radiolucent lines were present in 8/100 acetabular and 3/100 femoral components, osteolytic lesions were seen in three acetabular components. Mean neck narrowing was 9mm. No patients show any radiographic evidence of avascular necrosis. Conclusion This independent series shows the results of the Birmingham hip resurfacing are reproducible and comparable to those reported in the originating centre. The Birmingham hip resurfacing gives excellent clinical results, and there is no early evidence of radiographic failure. The high rate of neck narrowing gives us cause for concern and we would recommend regular radiographic follow up

Aims: To review the early results of Birmingham hip resurfacing (BHR). First 116 hips (98 patients). Materials: A cohort of consecutive patients prospectively underwent BHR in a single arthroplasty Surgeonñs practice in a University Hospital out side Birmingham. Inclusion criteria þt and active patients expected to out live conventional THR. 98 patients mean age 50 years (range 19–67). Pathology OA 85%, Perthes 7%, DDH 4.7% & SUFE 2%. Mean follow-up 30 months (range 12–45). Scoring systems used were Harris hip score (HHS), WOMAC & SF 36. Results: All patients under review, no radiological loosening. HHS:Mean pre-arthroplasty score 47 (range 10–73), 1 yr score 99 (n=38), 2yr 97.3 (n=30) at 3yr 100 (n=26) & 4th yr 100 (n=4), this shows a statistically signiþcant improvement (P=0.001). WOMAC: Pain: pre-op score 18.8, at 1 year 5.6 & 2nd year 5.7. Stiffness: pre-op 8.5, 1 year 2.7 & 2nd year 2.7. Physical: 49.3, 1 year 23.4 & 2nd year 22.6. This shows a statistically signiþcant improvement in score (p=0.025) SF-36 Analysed against an age/sex match control group of normal values using a 2 tailed Ôtñ Test, seven of the eight domains showed no statistical signiþcant difference. Complications: One fracture following a fall, 2 AVN & early fractures (patients had deep cysts in proximal head now such patients are not offered BHR), one dislocation following RTA Conclusions: Birmingham hip resurfacing can provide excellent level of activity and patient satisfaction. Careful patient selection is needed. A long-term study is needed to evaluate the long-term beneþt and survivorship

Introduction: Although resurfacing hip replacements are widely used there are few little independent outcome data to support this. The aim of this study was to report the 5 year clinical outcome and 7 year survival of an independent series. Method: 610 Birmingham hip resurfacings were implanted in 532 patients with an average age of 51.8 years (range 16.5–81.6 years) and were followed for between 2 to 8 years; 120 of this series had minimum five year follow-up. Two patients were lost. There were 23 revisions, giving an overall survival of 95% (95% CI 85–99%) at seven years. Fractured neck of femur (n=13) was the most common reason for revision, followed by aseptic loosening (n=4). There were also 3 patients who had failures that were possibly related to metal debris. At a minimum of 5 year follow-up 93% had excellent or good outcome according to the Harris Hip Score. The mean Oxford Hip Score was 16.1 points (SD 7.7) and the mean UCLA activity score was 6.6 points (SD 1.9). There were no patients with definite evidence of radiographic loosening or greater than 10% of neck narrowing. Discussion: The results demonstrate that with the Birmingham Hip Resurfacing, implanted using the extended posterior approach, the five year survival is similar or better to the reported survival rates for cemented and hybrid THR’s in young patients. Conclusions: Considering these patients are young and active these results are good and support the use of resurfacing. However, further study is needed to address the early failures; particularly those related to fracture and metal debris

Aim: The purpose of this study was to analyze the in-vivo wear rates of Birmingham Hip Resurfacing (BHR, Midland Medical Technologies Ltd., Birmingham, U.K.) explants and to contrast the results to the wear rates of conventional 28 mm metal-on-metal bearings (Metasul, Zimmer GmbH, Winterthur, Switzerland). Methods: The wear rates, measured by a coordinate measuring machine (CMM5, SIP, Geneva, Switzerland), of 6 femoral components and two complete pairings of the BHR retrieved from 8 hips were contrasted to 43 28 mm heads from second generation metal-on-metal bearings (Metasul, Sulzer Orthopaedics Ltd., Winterthur, Switzerland). Results: After 13 months (7 to 24) the BHR femoral heads showed a median volumetric wear rate of 2.9 mm. 3. (interquartile range: 0.8 to 7.1), slightly, but not significantly higher than the investigated 43 28mm Metasul heads (0.8 mm. 3. /year, p = 0.067, 14 months [7 to 24] in-situ). One BHR case with a cup abduction angle of 70° showed a significant higher wear rate of 17.8 mm. 3. All BHR cases showed only small amounts of metallic particle histological and correspondingly, a mild histiocytic tissue response without foreign body granuloma formation. Discussion: During the first two years after surgery the investigated BHR components showed wear rates substantially lower than conventional polyethylene bearings, comparable to Metasul bearings, implanted with very successful clinical results. But whether the wear rates will drop down after the so called running-in period comparable to conventional metal-on-metal bearings and provide young and active patients with a biologically acceptable particle volume over a long time period, still remains to be seen