A common location for radius fracture is the proximal radial head. With the arm in neutral position, the fracture usually happens in the anterolateral quadrant (Lacheta et al., 2019). If traditional surgeries are not enough to induce bone stabilization and vascularization, or the fracture can be defined grade III or grade IV (Mason classification), a radial head prosthesis can be the optimal compromise between bone saving and recovering the “terrible triad”. A commercially available design of radial head prosthesis such as Antea (Adler Ortho, Milan, Italy) is characterized by flexibility in selecting the best matching size for patients and induced osteointegration thanks to the Ti-Por. ®. radial stem realized by 3D printing with laser technique (Figure 1). As demonstrated, Ti-Por. ®. push-out resistance increased 45% between 8 −12 weeks after implantation, hence confirming the ideal bone-osteointegration. Additional features of Antea are: bipolarity, modularity, TiN coating, radiolucency, hypoallergenic, 10° self-aligning. The osteointegration is of paramount importance for radius, in fact the literature is unfortunately reporting several clinical cases for which the fracture of the prosthesis happened after bone-resorption. Even if related to an uncommon activity, the combination of mechanical resistance provided by the prosthesis and the stabilization due to the osteointegration should cover also accidental movements. Based upon Lacheta et al. (2019), after axial compression-load until radii failure, all native specimens survived a compression-load of 500N, while the failure happened for a mean compression force of 2560N. The aim of this research study was to test the mechanical resistance of a radial head prosthesis obtained by 3D printing. In detail, a finite element analysis (FEA) was used to understand the mechanical resistance of the core of the prosthesis and the potential bone fracture induced in the radius with simulated bone- resorption (Figure 2a). The critical level was estimated at the height for which the thickness of the core is the minimum (Figure 2b). Considered boundary conditions:. - Full-length prosthesis plus radius out of the cement block equal to 60mm (Figure 2a);. - Bone inside the cement equal to 60mm (Figure 2b);. - Load inclined 10° epiphysiary component (Figure 2c);. - Radius with physiological or osteoporotic bone conditions;. - Load (concentrated in the sphere simulating full transmission from the articulation) of 500N or 1300N or 2560N. Figure 3 shows the results in terms of maximum stress on the core of the prosthesis and the risk of fracture (Schileo et al., 2008). According to the obtained results, the radial head prosthesis shows promising mechanical resistance despite of the simulated bone-resorption for all applied loads except for 2560N. The estimated mechanical limit for the material in use is 200MPa. The risk of fracture is in agreement with the experimental findings (Lacheta et al. (2019)), in fact bone starts to fail for the minimum reported failure load, but only for osteoporotic conditions. The presented FEA aimed at investigating the behavior of a femoral head prostheses made by 3D printing with simulated bone-resorption. The prosthesis shows to be a skilled solution even during accidental loads. For any figures or tables, please contact the authors directly

Excision is not a suitable treatment for all comminuted fractures of the radial head. In elbows where instability can be predicted, a replacement arthroplasty of the radial head is more effective. The aim of this paper was to present the medium-term results of the Judet floating radial head prosthesis. This operation was performed on 14 patients between 1992 and 2003, of whom 12 were reviewed at a mean follow-up of five years and three months (1 to 12 years). The outcome was assessed using the Mayo elbow performance score and a modified Disability of Arm Shoulder Hand (DASH) questionnaire. There were six excellent results, four good, one fair and one poor, as graded by the Mayo score. The mean DASH score was 23.9/100 (0 to 65.8/100). The only significant complication occurred in one patient who developed a severe complex regional pain syndrome. There were no patients with secondary instability of the elbow, implant loosening, cubitus valgus, osteoporosis of the capitellum, or pain in the forearm and wrist. Our experience, combined with that of other authors using this device, has encouraged us to continue using the Judet prosthesis in comminuted fractures of the elbow where instability is a potential problem

Purpose: We reviewed retrospectively 22 patients with recent and old fractures of the radial head treated with the GUEPAR radial head prosthesis which has a mobile metal cup derived from the GUEPAR gliding total elbow prosthesis. Material and methods: Among the 22 patients, 13 underwent surgery in an emergency setting and four underwent a secondary procedure. Mean age was 41 years and follow-up was 18 months. The Mayo Clinic score was noted. Fractures were total or disengaged cervical fractures and in 72% of the elbows dislocation was associated. The coronoid process was fixed in one elbow, the olecranon in one and the medial ligaments were repaired in five. The status of the humeral condyle was examined in detail before insertion of the prosthesis. We also were particularly attentive concerning the height position of the prosthesis. Results: There were no complications. Outcome was good among the patients undergoing an emergency procedure with a mean Mayo Clinic score of 83/100, mean force 75%, good motion, particularly 77° pronation, and 79° supination, with good stability and absence of wrist problems. The patients who underwent a secondary procedure had less satisfactory results, particularly for motion (44° pronation and 54° supination). The distal radioulnar index was not perfectly restored. Finally four patients had arthrolysis for limited flexion/extension, three of them in the secondary group. Discussion: Resection of the radial head is an alternative for complex fractures that has its inconveniences. The first is that it destabilises the elbow in valgus position in the event of injury to the medial ligaments and the second is the ascension of the radius in the event of injury to the interosseous membrane. Fixation is another alternative, but it is difficult and has not provided good results in our hands or in the literature (we have compared this series with a series of 20 fixations for equivalent fractures). The prosthesis appears to be a good solution: it stabilises the elbow, prevents ascension of the radius, allows early rehabilitation, and provides good subjective outcome, particularly in emergency cases

Aims

It has been hypothesized that proximal radial neck resorption (PRNR) following press-fit radial head arthroplasty (RHA) is due to stress-shielding. We compared two different press-fit stems by means of radiographs to investigate whether the shape and size of the stems are correlated with the degree of PRNR.

The Essex-Lopresti injury (ELI) of the forearm is a rare and serious condition which is often overlooked, leading to a poor outcome.

The purpose of this retrospective case study was to establish whether early surgery can give good medium-term results.

From a group of 295 patients with a fracture of the radial head, 12 patients were diagnosed with ELI on MRI which confirmed injury to the interosseous membrane (IOM) and ligament (IOL). They were treated by reduction and temporary Kirschner (K)-wire stabilisation of the distal radioulnar joint (DRUJ). In addition, eight patients had a radial head replacement, and two a radial head reconstruction.

All patients were examined clinically and radiologically 59 months (25 to 90) after surgery when the mean Mayo Modified Wrist Score (MMWS) was 88.4 (78 to 94), the mean Mayo Elbow Performance Scores (MEPS) 86.7 (77 to 95) and the mean disabilities of arm, shoulder and hand (DASH) score 20.5 (16 to 31): all of these indicate a good outcome.

In case of a high index of suspicion for ELI in patients with a radial head fracture, we recommend the following: confirmation of IOM and IOL injury with an early MRI scan; early surgery with reduction and temporary K-wire stabilisation of the DRUJ; preservation of the radial head if at all possible or replacement if not, and functional bracing in supination. This will increase the prospect of a good result, and avoid the complications of a missed diagnosis and the difficulties of late treatment.

Cite this article: Bone Joint J 2014;96-B:1385–91.

Aims

Radial head arthroplasty (RHA) may be used in the treatment of non-reconstructable radial head fractures. The aim of this study was to evaluate the mid-term clinical and radiographic results of RHA.

Aims. The aim of this retrospective multicentre study was to evaluate mid-term results of the operative treatment of Monteggia-like lesions and to determine the prognostic factors that influence the clinical and radiological outcome. Patients and Methods. A total of 46 patients (27 women and 19 men), with a mean age of 57.7 years (18 to 84) who had sustained a Monteggia-like lesion were followed up clinically and radiologically after surgical treatment. The Mayo Modified Wrist Score (MMWS), Mayo Elbow Performance Score (MEPS), Broberg and Morrey Score, and Disabilities of the Arm, Shoulder and Hand (DASH) score were used for evaluation at a mean of 65 months (27 to 111) postoperatively. All ulnar fractures were stabilized using a proximally contoured or precontoured locking compression plate. Mason type I fractures of the radial head were treated conservatively, type II fractures were treated with reconstruction, and type III fractures with arthroplasty. All Morrey type II and III fractures of the coronoid process was stabilized using lag screws. Results. Good results were found for the MMWS, with a mean of 88.4 (40 to 100). There were 29 excellent results (63%), nine good (20%), seven satisfactory (15%), and one poor (2%). Excellent results were obtained for the MEPS, with a mean of 90.7 (70 to 100): 31 excellent results (68%), 13 good (28%), and two fair (4%). Good results were also found for the functional rating index of Broberg and Morrey, with a mean score of 86.6 (57 to 100). There were 16 excellent results (35%), 22 good (48%), six fair (13%), and two poor (4%). The mean DASH score was 15.1 (0 to 55.8). Two patients had delayed wound healing; four patients had nonunion requiring bone grafting. One patient had asymptomatic loosening of the radial head prosthesis. Conclusion. Monteggia-like lesions are rare. With correct identification, classification, and understanding using CT scans followed by appropriate surgical treatment that addresses all components of the injury, good to excellent mid-term results can be achieved. Cite this article: Bone Joint J 2018;100-B:212–18

Prosthetic radial head replacement is usually performed for trauma or post traumatic reconstruction. Therefore pain caused by a loose prosthesis might be incorrectly attributed to other causes. We lack reliable guidelines for diagnosing a loose radial head prosthesis that is symptomatic. Experience in Hip Arthroplasty has identified thigh pain as originating from the bone-prosthesis interface in the femoral canal, as opposed to the acetabulum or hip joint itself. The authors have recognized a similar phenomenon with radial head prostheses that has not yet been reported in the literature. Pain from a loose stem within the proximal radius may present as forearm pain. The medical records and radiographs of 14 consecutive cases (13 patients) with proximal radial forearm pain associated with a loose radial head prosthesis were reviewed retrospectively. From August 1999 to December 2006, 9 consecutive patients (10 cases) required revision surgery for painful aseptic loosening of a primary metal prosthetic radial head implant. One of the 9 patients required re-revision with a longer stem. A further 4 patients with symptomatic aseptic loosening have not yet been revised. The indication for revision surgery was painful loosening of the prosthesis within the canal of the proximal radius in 7 patients (8 cases) and pain with no evidence of loosening in 2 patients (2 cases). Various prosthetic designs had been used in the primary operations. In 12 of 14 cases the loosening was evident radiographically, but in 2 the only indication of a loose prosthesis (confirmed surgically) was proximal forearm pain. Revision or prosthetic removal eliminated the pain in 7 of 10 cases and decreased it in 1 Most of the patients who had relief of their forearm pain could tell in the first few days that the pain was gone following revision or removal of the loose radial head prosthetic component. One patient with moderate pain had an arthritic elbow and had no significant lasting relief from surgery. One patient was lost to follow-up. Follow-up averaged 27 months (range 1 to 66 months). Three of the 4 patients who had not yet undergone revision, were still awaiting revision and one did not want further surgery. In conclusion, the presence of radial sided proximal forearm pain in a patient with a radial head prosthesis is a strong indicator of symptomatic aseptic loosening. If the prosthesis has a textured surface for bone ingrowth, and was inserted without cement, we now consider this symptom to be diagnostic even in the absence of radiographic signs of loosening

Background. Comminuted radial head fractures are challenging to treat with open reduction and internal fixation. Complicating matters further, radial head fractures are often associated with other elbow fractures and soft tissue injuries. Radial head arthroplasty is a favorable technique for the treatment of radial head fractures. The purpose of this study was to evaluate the functional outcomes of radial head arthroplasty using Modular Pyrocarbon radial head prosthesis in patients with unreconstructible radial head fractures. Methods. This single surgeon, single centre study retrospectively reviewed the functional and radiological outcomes of 21 consecutive patients requiring radial head arthroplasty for unreconstructible radial head fractures between July 2003 and July 2009. Patients were at least one year post-op and completed a Short-Form 36 (SF-36) questionnaire, the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire, and the Mayo Elbow Performance Index (MEPI). These patients were independently physically examined and their post-operative radiographs were independently reviewed. Results. 21 patients (9 males and 12 females) were reviewed at a minimum of 12 months follow-up. The mean DASH score was 10.8 (0-34.1), the mean SF-36 physical score was 76.9 (35-96), the mean SF-36 mental score was 83.8 (60-94), and their MEPI score was 86.4 (70-100). Patients maintained 90% of their grip strength in their injured arm when compared to their un-injured arm and had 17. o. of fixed flexion in the affected arm. Radiologically, 14 cases had some degree of post-traumatic osteoarthritis, 12 cases had evidence of heterotrophic ossification, 5 had some evidence of periprosthetic lucency and 3 of our cases were radiologically but not functionally ‘overstuffed’. Conclusion. Radial Head Arthroplasty with Pyrocarbon Radial Head Prosthesis is a safe and effective option when treating unreconstructable comminuted radial head fractures yielding good functional and radiological outcomes and remains the treatment option of choice at our institution

Essex-Lopresti injuries are often unrecognized acutely with resulting debilitating adverse effects. Persistent axial forearm instability may affect load transmission at both the elbow and wrist, resulting in significant pain. In the setting of both acute and chronic injuries metallic radial head arthroplasty has been advocated, however there is little information regarding their outcome. The purpose of this study was to assess the efficacy of a radial head arthroplasty to address both acute and chronic Essex-Lopresti type injuries. A retrospective review from 2006 to 2016 identified 11 Essex-Lopresti type injuries at a mean follow-up of 18 months. Five were diagnosed and treated acutely at a mean of 11 days (range, 8 to 19 days) from injury, while 6 were treated in a delayed fashion at a mean of 1.9 years (range, 2.7 months to 6.2 years) from injury with a mean 1.5 (range, 0 to 4) prior procedures. The cohort included 10 males with a mean age was 44.5 years (range, 28 to 71 years). A smooth stem, modular radial head arthroplasty was used in all cases. Outcomes included range of motion and radiographic findings such as ulnar variance, capitellar erosion, implant positioning and implant lucency using a modification of the method described by Gruen. Reoperations, including the need for ulnar shortening osteotomy, were also recorded. Three patients in each group (55%) reported persistent wrist pain. The mean ulnar variance improved from +5 mm (range, 1.8 to 7 mm) to +3.7 mm (range, 1 to 6.3 mm) at the time of final follow-up or prior to reoperation. Three (50%) patients in the chronic group underwent a staged ulnar shortening osteotomy (USO) to correct residual ulnar positive variance and to manage residual wrist pain. There were no reoperations in the acute group. Following USO, the ulnar variance in those three cases improved further to +3.5, +2.1, and −1.1 mm. No radial head prostheses required removal. Capitellar erosion was noted in five (45%) elbows, and was rated severe in one, moderate in two, and mild in two. Lucency about the radial head prosthesis stem was noted in eight (73%) cases, and rated as severe in 2 (18%), based on Gruen zones. Treatment of acute and chronic Essex-Lopresti lesions with radial head arthroplasty often results in persistent wrist pain. In the chronic setting, a planned USO was often necessary to restore axial forearm stability after radial head arthroplasty. Essex-Lopresti lesions represent a rare clinical entity that are difficult treat, particularly in the chronic setting. Early recognition and management with a smooth stem modular radial head arthroplasty may provide improved outcomes compared to chronic reconstruction

INTRODUCTION:. Radial head arthroplasty is a reliable procedure with good functional outcomes when faced with irreparable radial head fractures. Since the first attempt at arthroplasty by Speed in 1941, there have been a variety of different designs created for radial head prostheses. There has been considerable recent interest in bipolar radial head components. However, to date, there have been few biomechanical studies comparing bipolar components to their monopolar counterparts. We examine the effects of alteration of axial length of the radial head prosthesis and force conveyed at the radiocapitellar joint in a head-to-head comparison of bipolar implants to monopolar implants. METHODS:. Sixteen fresh-frozen, sided cadaveric arms were utilized. Radial heads were resected and either a monopolar, rigid, metal radial head prosthesis (Solar, Stryker, Mahwah, NJ) was implanted or a bipolar metal prosthesis used (Katalyst, Integra, Plainsboro, NJ). Adjustments of radial head length were made in 2 mm increments using radiolucent washers to create an understuffed (−2), neutral (0), and overstuffed (+2, +4) effect, see Fig. 1. Forearms were cyclically loaded in compression from 13N to 130N with the forearm in neutral. Radiocapitellar forces were measured using Tekscan (Tekscan, Inc., Boston, MA) pressure sensors with radial head length set at −2 mm, 0, +2 mm and +4 mm and comparisons were made with the neutral (0) radial head, see Fig. 2. Multivariant ANOVA with Tukey's HSD correction was used for statistical analysis. RESULTS:. Radiocapitellar average peak pressures using monopolar and bipolar radial heads in arms that were understuffed (−2 mm), were 0.54 and 0.39 MPa, respectively; neutral (0 mm), 0.68 and 0.36 MPa; and overstuffed (+2 mm), 0.44 and 0.39 MPa; (+4 mm), 0.48 and 0.40 MPa, respectively. There was a noticeable stepwise increase in force transmitted with progressive radial head lengthening regardless of implant design. Radiocapitellar forces were almost 1.5 times greater with monopolar radial head overstuffing (+4) compared to neutral (0) while they essentially doubled with bipolar radial head overstuffing (+4) compared to neutral (0) (p < 0.01). The average change in measured values for the monopolar prostheses compared to the bipolar prostheses in the same arm are shown in Figure 2. DISCUSSION:. Progressive radial head lengthening regardless of implant design was associated with a stepwise increase in radiocapitellar joint force. Radiocapitellar forces where notably lower with the bipolar radial head when compared to their monopolar counterparts. This may in part be due to the bipolar design which allows for increased play at the radiocapitellar junction., see Fig. 3. Significance: Sizing and selection of the radial head implant plays a critical role in restoring native radiocapitellar loads and may prevent accelerated wear at the radiocapitellar joint after radial head arthroplasty. Figure 1 – Radial head length was controlled by applying 2 mm thick washers beneath the head, shown here with a monopolar prosthesis. Figure 2 – The bipolar radial head transmitted less force, greater contact area and lower peak pressures than with monopolar prostheses. Figure 3 – This radiographic image shows the potential for the bipolar radial head implant to realign to the joint under load

The proper management of radial head fractures is difficult and controversial. The radial head is intra-articular, part of the forearm ring and participates in both flexion and extension as well as in pronosupination. Our main goal in treating those fractures is anatomic restoration of the joint surface and early mobilization. Excision of the radial head, a well described procedure, may result in elbow instability and proximal migration of the radius. In this work we tried to avoid those complications by either conserving the head (ORIF) or by using a Radial head prosthesis. Material and Methods: 20 Patients were enrolled into the study between 2003–2004. They were divided into 2 groups. 10 patients had ORIF and in patients the Corin Radial head prosthesis was used. Post-op all patients started immediate CPM. All patients were followed-up for 12–28 months (average 18.6). XR were taken each time and clinical examination was done, ROM was noted as well as muscle strength. Elbow stability was tested only on the 2. nd. month post op. Patient satisfaction was noted based of their function ability, and the amount of pain. Pain was rated on a scale of 1–10. Results: Both groups passed the surgery uneventfully. No neurovascular damage nor infection were noted. In clinical examination the elbow was found to be stable in both groups. Decreased ROM in compare with the other elbow was found in both groups, but was more prominent in he ORIF group. One patient in the ORIF group in which biodegradable rod was used developed moderate synovitis that passed without intervention after 9 weeks. XR reveled that one patient in the ORIF group developed Heterotopic ossification, no dislocation or subluxation of the prosthesis was seen. Regarding to pain, in the ORIF group the patients rated their pain as milder in compare to those in the prosthetic group. Conclusions: Both methods result in stable elbow but the ORIF group showed tendency to experience less pains and the prosthesis group showed tendency to better ROM

Purpose: We conducted a retrospective study of 20 total elbow prostheses GUEPAR humerocubital and humeroradial (G3) implanted in 19 patients with rheumatoid arthritis. This anatomic metal-polyethylene prosthesis is available in a left and right model and in two sizes, large and small. A radial head prosthesis is now available in addition to the humerocubital prosthesis. The radial head prosthesis has an intramedullary metallic stem and a mobile polyethylene cup which comes in several sizes. Material and methods: Among 20 prostheses implanted between 1997 and 2001, four were first-generation prostheses which did not have a radial head. At three to four years, these four prostheses developed valgus instability with deterioration of the polyethylene of the cubital piece requiring revision with a new generation GUEPAR associated with a radial head. This gave two good results and two failures revised with a semi-constrained prosthesis. For the 16 other cases of rheumatoid disease, the G3 humerocubital prosthesis associated with a radial head was inserted. These 16 prostheses were followed two years and were retained for this analysis. The posterior approach was used with inverted-V section of the triceps using the surgical technique recommended by the promoters. Patients had permanent severe to moderate pain. The Mayo Clinic score (1992 including daily life activities) was 33/100. Radiographically, seven elbows were Larsen grade III, nine grade IV, seven grade IIA and nine grade IIIb (Larsen classification modified by the Mayo Clinic). Results: All patients were reviewed with mean follow-up of two years (1–5). The Mayo Clinic score improved from 33/100 to33/90 with outcome considered excellent in 15 elbows and fair in one. Discussion: We recommend total elbow prostheses for rheumatoid arthritis patients. Semi-constrained prostheses have indications in certain cases of massive destruction, but the minimally or non-constrained gliding prostheses, such as the GUEPAR prosthesis, are part of the evolution of these prostheses, just as was the case for knee prostheses. These good results can be expected to persist over time

Aims

In patients with a failed radial head arthroplasty (RHA), simple removal of the implant is an option. However, there is little information in the literature about the outcome of this procedure. The aim of this study was to review the mid-term clinical and radiological results, and the rate of complications and removal of the implant, in patients whose initial RHA was undertaken acutely for trauma involving the elbow.

Aims

Acute and chronic injuries of the interosseus membrane can result in longitudinal instability of the forearm. Reconstruction of the central band of the interosseus membrane can help to restore biomechanical stability. Different methods have been used to reconstruct the central band, including tendon grafts, bone-ligament-bone grafts, and synthetic grafts. This Idea, Development, Exploration, Assessment, and Long-term (IDEAL) phase 1 study aims to review the clinical results of reconstruction using a synthetic braided cross-linked graft secured at either end with an Endobutton to restore the force balance between the bones of the forearm.

Aims

The aim of this study was to analyze how proximal radial neck resorption (PRNR) starts and progresses radiologically in two types of press-fit radial head arthroplasties (RHAs), and to investigate its clinical relevance.

Aims

The aim of this study was to evaluate the outcome of complex radial head fractures at mid-term follow-up, and determine whether open reduction and internal fixation (ORIF) or radial head arthroplasty (RHA) should be recommended for surgical treatment.

The clinical case refers to a male patient, 34 years old, admitted at the Emergency Department after a fall of 2 meters. Of that trauma, resulted an exposed Monteggia fracture type III – Gustillo & Anderson IIA – on his left arm. With this work, the authors intend to describe the evolution of the patient's clinical condition, as well as the surgical procedures he was submitted to. The authors used the patient's records from Hospital's archives, namely from the Emergency Department, Operating Room, Infirmary and Consultation, and also the diagnostic exams performed throughout the patient's clinical evolution. The clinical case began in December 2011, when the patient suffered a fall of 2 meters in his workplace. From the evaluation in the Emergency Department, it was concluded that the patient presented, at the left forearm, an exposed Monteggia type III fracture – Gustillo & Anderson IIA – combined with a comminuted fracture of the radial head. At the admission day, the wound site was thoroughly rinsed, the fracture was reduced and immobilized with an above-the-elbow cast, and antibiotics were initiated. Six days after admission, the patient was submitted to open reduction with internal fixation with plate and screws of the fracture of the ulna and radial head arthroplasty. The postoperative period was uneventful. Two months after the surgical procedure, inflammatory signals appeared with purulent secretion in the ulnar suture. Accordingly, the patient was submitted to fistulectomy, rinsing of the surgical site and a cycle of antibiotics with Vancomycin, directed to the S. aureus isolated from the purulent secretion. The clinical evolution was unfavorable, leading to the appearance of a metaphyseal pseudarthrosis or the ulna and dislocation of the radial head prosthesis. The previously implanted material was therefore removed, 4 months after the traumatic event; at the same time an external fixation device was applied and the first part of a Masquelet Technique was conducted. The second part of the aforementioned procedure was carried out in December 2012. The patient was discharged from the consultation after a 2 years follow-up, with a range of motion of the left elbow acceptable for his daily living activities. In spite of the multiple surgical rinsing procedures and directed antibiotics, the development of a metaphyseal pseudarthrosis of the ulna was inevitable. This clinical case illustrates how the Masquelet Technique presents itself as a good solution for the cases of non-union of fractures in the context of infection

Purpose. Assess and report the functional and post-operative outcomes of complex acute radial head fractures with elbow instability treated by arthroplasty using an uncemented modular anatomic prosthesis. Methods. Over a 3-year period (2007–2010), 21 patients (mean age 51.9 years) were treated primarily with modular radial head arthroplasty (mean follow up of 27.1 months). Data was collected retrospectively using clinical notes, operation documentation and prospectively using validated scoring systems namely the Oxford Elbow Index, Quick DASH and the Mayo Elbow Performance Score. Associated elbow fractures, ligamentous injury and short to mid term post-operative outcomes including radiographic assessment were recorded. Results. The mean Oxford Elbow Score was 34.80 (range 20–48). The mean Quick Dash score was 26.01 (range 0–68.2). The Mayo Performance score showed 6 scored excellent, 5 scored good, 3 scored fair and 2 scored poor. Regarding post-operative outcomes, 1 patient had a radial head dislocation, 1 patient had prosthesis removal for ongoing pain and 1 patient had a total elbow replacement due to associated proximal ulna fracture non-union. 11 patients had an associated ligamentous injury of which 6 had an associated coronoid fracture. Of note, 7 patient's radiographs showed early signs of implant loosening; this was mainly asymptomatic. Conclusions. With regard to complex radial head fractures with elbow instability, patient outcome measures showed good functionality and overall patient satisfaction despite radiographic evidence of loosening. Post-operative complication rates were low. These findings support the use of this radial head prosthesis in arthoplasty surgery for the treatment of complex acute radial head fractures with elbow instability

To study the surgical outcome of multi-fragmentary, un-reconstructable radial head fractures managed acutely by a radial head prosthetic replacement, we retrospectively reviewed nineteen radial head fractures that were treated acutely with a radial head replacement, over a four-year period in three district general hospitals. Nineteen patients were clinically and radiologically assessed for this study. Functional assessment was performed with the Mayo elbow performance score (MEPS). No patient achieved full functional range of motion. The average range of flexion was 110° (range 80° to 120°), average extension deficit of 35° (range 30° to 45°), average pronation was 35° (range 0° to 65°), and average supination was 50° (range 30° to 85°). Complications included implant removal due to loosening (n=1), elbow stiffness (n=2), and instability (n=1), the latter case requiring a revision of the radial head prosthesis. Some degree of persistent discomfort was noticed in all cases. Five patients were tolerant of the final functional outcome. The average Mayo elbow score was 68/100 (range 55 to 80). One patient had an intra-operative fracture of the radial metaphysis during insertion of the implant. Conclusions. Radial head replacement in general orthopaedic, low volume practice failed to achieve satisfactory results. Contrary to popular belief, it is a technically demanding operation, for which surveillance should be continued for a minimum of one year. Strict indications for prosthetic replacement should be followed and implant selection has yet to be proven to make a significant positive contribution. Our review highlights the need for a stricter adherence to indications; surgery should not be under-estimated and devolved to trainees, and our understanding of the radial axis of the elbow and forearm remains relatively rudimentary