Lisfranc injuries make up 0.2% of all fractures. With or without midfoot injuries, treatment requires early accurate diagnosis, anatomical reduction and stable internal fixation. Some surgeons prefer K-wire fixation, while others rely on rigid screw fixation, especially of the medial column. To assess the radiological and functional outcome of K-wire fixation of Lisfranc injuries, we carried out a prospective study between January 1999 and December 2000. The ages of our 15 male and four female patients ranged from 15 to 47 years. Using the Quenu and Kuss system to classify injuries, we treated five isolated, nine homolateral and five divergent injuries. In eight patients there were associated midfoot injuries, and four had compound fractures. We treated 11 fractures with closed reduction and K-wires. Open reduction with K-wire fixation was carried out on eight fractures, including the four compound fractures, within 19 days of admission. All patients were kept non-weight-bearing in a short backslab, and the wires removed at six weeks. Follow-up times ranged from 4 to 19 months. To assess functional outcome we used the American Orthopaedic Foot and Ankle Society’s midfoot scoring system, which has a maximum score of 100. The mean score of our patients was 70 (52 to 85). Mild or occasional foot pain and slight gait abnormality resulted in limitation of recreational activities. At three months, 15 patients were fully weight-bearing. A single case of superficial sepsis resolved, and there were no cases of implant failure or loss of reduction. K-wire fixation following anatomical reduction is a satisfactory option for the treatment of tarsometatarsal injuries, especially when severe injuries involve the midfoot. The technique is minimally invasive and the K-wires are easily inserted and removed

Background. Percutaneous K-wire fixation is a well-recognised and often performed method of stabilisation for distal radius fractures. However, there is paucity in the literature regarding the infection rate after percutaneous K-wire fixation for distal radius fractures. Aims. To analyse the rate and severity of infection after percutaneous K-wire fixation for distal radius fractures. Material and methods. Between October 2004 and June 2005, 43 patients with closed distal radius fractures had percutaneous K-wire fixation. The wires were left outside the skin in all the cases for easy removal at the end of six weeks at the clinic. They were followed up in the clinic at 1, 2, 4, and 6 weeks. The pin tracts were examined at 2 weeks and six weeks, or if needed earlier. The severity of pin tract infection was graded using modified Oppenheim classification. Results. Out of 43 patients, the male to female ratio was 13:30. The mean age was 49.1 years (range 5-86 years). There were nine cases of pin tract infection, out of which three were grade I, three were grade II, two were grade III, and one was grade IV. In three cases the K-wires had to be removed earlier. Discussion. The infection rate after percutaneous K-wire fixation for distal radius fractures is high (20.9%), which is equivalent to the infection rate quoted in the literature for hybrid external fixators. As the K-wires are used to fix the fractures, the expected implant infection rate in Trauma and Orthopaedics which is less than 1% should be aimed for. However this is not the case. Hence, burying the K-wires under the skin may be an alternative to reduce the infection rate after percutaneous K-wire fixation of distal radius

Purpose: This study compares clinical and radiological outcomes of K-wire fixation with volar locking plate (i.e. fixed angle) fixation in unstable, dorsally angulated, distal radius fractures. Materials and methodology: Fifty four adult patients with an isolated, closed, unstable, dorsally angulated fracture without articular comminution were randomised to closed reduction and K-wire fixation (3 wires) or volar locking plate fixation. All were immobilised in a cast for six weeks and prescribed physiotherapy. Independent clinical and radiological assessment was performed at 3 and 6 months post injury, using the DASH and Gartland & Werley scoring systems. Results: Twenty-four patients were treated with a plate and thirty with K-wires. There were no complications in the plate group. There were 9 complications in the K-wire group. Three patients required re-operation (for malunion, median nerve compression, and retrieval of a migrated wire). Remaining complications included: 5 pin-site infections and 1 superficial radial nerve palsy. Plate fixation achieved statistically significant better radiological and functional results. Conclusion: Volar locking plate fixation achieves better radiological and functional results with fewer complications than K-wire fixation in unstable, dorsally angulated, distal radius fractures

This study aims to compare the outcomes of Volar locking plating (VLP) versus percutaneous Kirschner wires (K-wire) fixation for surgical management of distal radius fractures. We systematically searched multiple databases, including MEDLINE for randomized controlled trials (RCTs) comparing outcomes of VLP fixation and K-wire for treatment of distal radius fracture in adults. The methodological quality of each study was assessed by the Cochrane Risk of Bias tool. Patient-reported outcomes, functional outcomes, and complications at 1 year follow up were evaluated. Meta-analysis was performed using random-effects models and results presented as risk ratios (RRs) or mean differences (MDs) with 95% confidence interval (CI). 13 RCTs with 1336 participants met the inclusion criteria. Disabilities of the Arm, Shoulder and Hand (DASH) scores were significantly better for VLP fixation (MD= 2.15; 95% CI, 0.56-3.74; P = 0.01; I2=23%). No significant difference between the two procedures for grip strength measured in kilograms (MD= −3.84; 95% CI,-8.42-0.74; P = 0.10; I2=52%) and Patient-Rated Wrist Evaluation (PRWE) scores (MD= −0.06; 95% CI,-0.87-0.75; P = 0.89; I2=0%). K-wire treatment yielded significantly improved extension (MD= −4.30; P=0.04) but with no differences in flexion, pronation, supination, and radial deviation (P >0.05). The risk of complications and rate of reoperation were similar for the two procedures (P >0.05). This meta-analysis suggests that VLP fixation improves DASH score at 12 months follow up, however, the difference is small and unlikely to be clinically important. Existing literature does not provide sufficient evidence to demonstrate the superiority of either VLP or K-wire treatment in terms of patient-reported outcomes, functional outcomes, and complications

Aim: We report radiological outcome following percutaneous minimally invasive corrention of Hallux Valgus using K-wire fixation. Methods: We followed 15 patients (11 bilateral operations) who had above procedure for Hallux Valgus deformity correction. All patients had pre operative and post operative x-rays assessed for Hallux Valgus angle, 1st Intermetatarsal angle and Distal Metatarsal Articular angle. We also collected clinical data including deformity correction and complications. Results: Mean age of the patients was 55.47(SD 14.27). Of the 15 procedures 11 had bilateral operations and 4 had only one side operated (total 14 right sided 12 left sided operations). Mean duration of follow up was 85.47 days (range 29 to 259). The pre operative mean Hallux Valgus angle was 37.05(SD 6.49, range 28 to 49) where as post operative it was 11.32(SD 9.07, range 0 to 33). The pre operative mean 1st Intermetatarsal angle was 16.46(SD 2.74, range 11 to 21) where as post operative it was 5.48(SD 3.62, range 1 to 16). The pre operative mean Distal metatarsal articular angle was 35.36(SD 8.38, range 18 to 51) where as post operative it was 8.29(SD 9.13, range 0 to 38). Clinically one great toe had infection post operatively requiring early removal of K-wires resulting in residual deformity. One had mild bilateral recurrence, two had mild unilateral recurrence. These patients did not require any further surgery. Conclusion: Above results indicate that Percutaneous Minimally invasive Hallux Valgus correction using K-wire fixation showed good radiological correction in various angles measured to quantify Hallux Valgus deformity

The aim of this study is to compare functional, clinical and radiological outcomes in K-wire fixation versus volar fixed-angle plate fixation in unstable, dorsally angulated distal radius fractures. Fifty-four adult patients with an isolated closed, unilateral, unstable, distal radius fracture were recruited to participate in the study. Only dorsally displaced fractures with no articular comminution were included. Patients were randomised to have their fracture treated with either closed reduction and K-wire fixation (3 wires) or fixed-angle volar plating. Both groups were immobilised in a below elbow cast for six weeks. The wires removed in the outpatients at six weeks and both groups were referred for physiotherapy. Independent clinical review was performed at three and six months post injury. Functional scoring was performed using the DASH and Gartland and Werley scoring systems. Radiographs were evaluated by an independent orthopaedic surgeon. Twenty-five patients were treated with a plate and twenty-nine with wires. There were no complications in the plate group. There were 9 complications in the K-wire group with 3 patients requiring a second operation (1 corrective osteotomy for malunion, 1 median nerve decompression and 1 retrieval of a migrated wire). The remaining complications included: 5 pin site infections (3 treated with early pin removal and 2 with oral antibiotics only), and 1 superficial radial nerve palsy. There were no tendon ruptures. Both groups scored satisfactory functional results with no statistical difference. There was a statistically significant difference in the radiological outcomes with the plate group achieving better results. We conclude that in unstable dorsally angulated distal radius fractures volar fixed-angle plate fixation is able to achieve comparable functional results to K-wire fixation with better radiological results and fewer complications. This has resulted in a change in our clinical practice

Aims. Management of displaced paediatric supracondylar elbow fractures remains widely debated and actual practice is unclear. This national trainee collaboration aimed to evaluate surgical and postoperative management of these injuries across the UK. Methods. This study was led by the South West Orthopaedic Research Division (SWORD) and performed by the Supra Man Collaborative. Displaced paediatric supracondylar elbow fractures undergoing surgery between 1 January 2019 and 31 December 2019 were retrospectively identified and their anonymized data were collected via Research Electronic Data Capture (REDCap). Results. A total of 972 patients were identified across 41 hospitals. Mean age at injury was 6.3 years (1 to 15), 504 were male (52%), 583 involved the left side (60%), and 538 were Gartland type 3 fractures (55%). Median time from injury to theatre was 16 hours (interquartile range (IQR) 6.6 to 22), 300 patients (31%) underwent surgery on the day of injury, and 91 (9%) underwent surgery between 10:00 pm and 8:00 am. Overall, 910 patients (94%) had Kirschner (K)-wire) fixation and these were left percutaneous in 869 (95%), while 62 patients (6%) had manipulation under anaesthetic (MUA) and casting. Crossed K-wire configuration was used as fixation in 544 cases (59.5%). Overall, 208 of the fixation cases (61%) performed or supervised by a paediatric orthopaedic consultant underwent lateral-only fixation, whereas 153 (27%) of the fixation cases performed or supervised by a non-paediatric orthopaedic consultant used lateral-only fixation. In total, 129 percutaneous wires (16%) were removed in theatre. Of the 341 percutaneous wire fixations performed or supervised by a paediatric orthopaedic consultant, 11 (3%) underwent wire removal in theatre, whereas 118 (22%) of the 528 percutaneous wire fixation cases performed or supervised by a non-paediatric orthopaedic consultant underwent wire removal in theatre. Four MUA patients (6%) and seven K-wire fixation patients (0.8%) required revision surgery within 30 days for displacement. Conclusion. The treatment of supracondylar elbow fractures in children varies across the UK. Patient cases where a paediatric orthopaedic consultant was involved had an increased tendency for lateral only K-wire fixation and for wire removal in clinic. Low rates of displacement requiring revision surgery were identified in all fixation configurations. Cite this article: Bone Joint J 2023;105-B(1):82–87

In a prospective trial, biodegradable polyglycolic acid rods were compared with Kirschner wires for fixation of wrist fractures (Frykman types I, II, V and VI). Fifteen patients were randomly assigned to each treatment group. There was no significant difference between the groups with regard to age, sex ratio and fracture type. Kapandji's pinning technique was used in all cases. There were no significant differences in the results obtained in both groups at final follow-up. At three months and six months the functional results of the Kirschner-wire group were, however, significantly better (p < 0.05), due to numerous transient complications from foreign-body reactions to the polyglycolic acid rods. The use of polyglycolic acid rods is therefore not recommended for the fixation of distal radial fractures

Conservative treatment of the ‘boxer’s fracture’ gives acceptable functional results but often leaves the patient with a residual deformity.

Using a prograde intramedullary K-wire, we treated 23 consecutive patients with a fractured neck of the fifth metacarpal. Volar angulation exceeded 40°. A 1.6-mm pre-bent K-wire was inserted via the base of the fifth metacarpal in each case. Time to regaining full function, time to union and final functional and radiological outcome were recorded.

All 23 patients went on to full clinical and radiological union within six weeks. In 18 patients, the reduction was anatomical with no residual angulation. In five the residual angulation ranged from 5° to 15°, with a mean of 8°. There was a transient sensory neuropraxia in two patients.

This minimally invasive technique is a simple, cost-effective and reliable method of treating a ‘boxer’s fracture’ and ensures a rapid return to full function with little or no residual deformity.

Mitchell – Hawkins osteotomy is a widely used technique for correction of mild to moderate hallux valgus. Several authors have recognised that, for a good result, the osteotomy must be stable enough to prevent excessive shortening or displacement of the distal fragment. Several fixation techniques have been proposed: sutures, staples, K-wires and screws. The aim of the study is to define whether the use of a screw could give better results than a single K-wire in the fixation of the osteotomy. We studied prospectively 30 patients with moderate hallux valgus operated on consecutively at our institute using the Mitchell osteotomy. In 15 patients (Group A) fixation was achieved with a single K-wire inserted through the tip of the toe and driven medial to the metatarsal head into the first metatarsal shaft, while in the others (Group B) a Herbert screw was used. All procedures were identical except for the fixation device and were carried out by the same surgeon. Weight bearing was allowed from the first day after surgery with a postoperative shoe. The K-wire was removed at the fifth postoperative week. In Group B the correct position of the great toe was maintained with a dressing, renewed weekly for 8 weeks after surgery. Patients were evaluated clinically with the AOFAS score and radiologically either before surgery and at the follow-up. The mean follow-up time was 10 months. We did not find any difference between the groups in correction of the intermetatarsal angle and of the valgus angle or in the improvement of the AOFAS score. No symptomatic displacement of the distal fragment occurred in either group. Five patients of Group A complained of a pin tract infection of the K-wire, which was treated successfully with oral antibiotics. No deep infection occurred. All the patients were satisfied with the treatment received but the majority of those of Group A (10/15) complained of discomfort in leaving the K-wire in place for such a long time. The Mitchell – Hawkins osteotomy can be fixed either with a K-wire or a screw with similar results in terms of angle correction and clinical scores. Patients felt more comfortable without protruding fixation devices, but for a successful procedure with the use of a screw, repeated dressing of the foot is required, which is time-consuming for both the surgeon and the patient.

To ascertain the optimum number, thickness and configuration of K-wires needed to prevent displacement of distal radial fractures.

Synthetic and cadaver bones were used. A transverse osteotomy was performed 1. 5 cm proximal to the articular surface of the distal radius. Different numbers and configurations of 1. 1mm or 1. 6mm K-wires were used to hold the bone reduced. Dorsoradial and distraction forces were applied using a tensiometer. The endpoint was a displacement of 3mm at the osteotomy site.

We demonstrated a statistically significant increase in the force required to displace the osteotomy site a) when using thicker wires and b) when using three crossed wires compared with two wires either crossed or parallel.

When balancing ease of insertion with maximum stability, we would recommend two parallel 1. 6mm wires inserted through the radial styloid process, with 1 wire inserted from the dorsoulnar corner of the radius crossing at approximately 90 degrees. All wires should pass into the opposite cortex. This configuration resisted forces of over 300 Newtons and there was little benefit in using additional wires.

The use of percutaneous Kirschner wires [K-wires] and plaster is a popular method of treatment for displaced distal radius fracture. However, multi-database electronic literature review reveals unsurprisingly different views regarding their use.

From August 2002 till June 2004, 280 distal radial fractures were admitted to our orthopaedic department. They were recorded prospectively in the departmental trauma admissions database. We studied the 87 cases treated with the K-wires and plaster technique. They were classified according to the AO classification system. The mean patient age was 53 [5-88] years. The mean delay before surgery was 7 [0-24] days. We studied the complications reported by the attending orthopaedic surgical team. 48 out of 87 patients [55.1%] were reported to have complications.

We analysed the displacement and the pin tract infection, as they were the main reported complications. 28 out of 87 patients [32%] had displacement [9 had further surgery to correct the displacement, 19 did not have any further surgery as the displacement was accepted]. 11 out of 87 patients [12.6%] had pin tract infection [7 needed early removals of the K-wires and systematic treatment]. Further analysis showed no statistically significant relation between the complications rate and the age of the patients, the delay before surgery or the type of the fractures.

We demonstrate a considerable high displacement and infection rate with the use of K-wires and plaster technique for fixation of distal fracture irrespective of the age of the patients, the delay before surgery or the fracture classification. There are other methods for fixation of the distal radial fracture with proven less morbidity which should be considered.

Aims

The aim of this study was to compare the cost-effectiveness of surgical fixation with Kirschner (K-)wire ersus moulded casting after manipulation of a fracture of the distal radius in an operating theatre setting.

Aims. The aim of this study was to examine trends in the management of fractures of the distal radius in Ireland over a ten-year period, and to determine if there were any changes in response to the English Distal Radius Acute Fracture Fixation Trial (DRAFFT). Patients and Methods. Data was grouped into annual intervals from 2008 to 2017. All adult inpatient episodes that involved emergency surgery for fractures of the distal radius were included. Results. In 2008 Kirschner-wire (K-wire) fixation accounted for 59% of operations for fractures of the distal radius, and plate fixation for 21%. In 2017, the rate of K-wire fixation had fallen to 30%, and the proportion of patients who underwent plate fixation had risen to 62%. Conclusion. There is an increasing trend towards open reduction and internal fixation for fractures of the distal radius in Ireland. This has been accompanied by a decrease in popularity for K-wire fixation. DRAFFT did not appear to influence trends in the management of fractures of the distal radius in Ireland. Cite this article: Bone Joint J 2019;101-B:1550–1556

Background. Research on midfoot injuries have primarily concentrated on the central column and the Lisfranc ligament without amassing evidence on lateral column injuries. Lateral column injuries have historically been treated with Kirschner wire fixation when encountered. Objective. Our aim in this study was to analyse lateral column injuries to the midfoot, their method of treatment and the radiological lateral column outcomes. Our nul hypothesis being that fixation is required to obtain and maintain lateral column alignment. Methods. Data was retrospectively collected from four centres on surgically treated midfoot fracture dislocations between 2011 and 2021. Radiographs were analysed using departmental PACS. All statistics was performed using SPSS 26. Results. A total of 235 cases were diagnosed as having a lateral column injury out of the 409 cases included. On cross tabulation, there was a significant association with having a central column injury (234/235, p<.001) and 70% of cases (166/235) also had an additional medial column injury. Of the 235 lateral column injuries, data was available regarding fixation radiographic alignment on 222 cases. There were 44 cases which underwent Kirschner wire fixation, 23 plate fixations and 3 screw fixations. Lateral column alignment loss was seen in 2.84% (4/141) of those which didn't undergo fixation, 13.64% (6/44) which underwent K wires, and 0 % in those fixed by screws or K wires. Conclusion. Lateral column injury occurs in over half of midfoot fractures in this study. It rarely occurs alone and is most commonly related to three column injuries. Nevertheless, following stabilisation of the central column, additional fixation of injuries to the lateral column do not appear beneficial. The use of a bridge plate to fix the central column appears protective and purely ligamentous injury was a higher risk than an injury that included the bone

Aims. Displaced fractures of the lateral condyle of the humerus are frequently managed surgically with the aim of avoiding nonunion, malunion, disturbances of growth and later arthritis. The ideal method of fixation is however not known, and treatment varies between surgeons and hospitals. The aim of this study was to compare the outcome of two well-established forms of surgical treatment, Kirschner wire (K-wire) and screw fixation. Patients and Methods. A retrospective cohort study of children who underwent surgical treatment for a fracture of the lateral condyle of the humerus between January 2005 and December 2014 at two centres was undertaken. Pre, intraoperative and postoperative characteristics were evaluated. A total of 336 children were included in the study. Their mean age at the time of injury was 5.8 years (0 to 15) with a male:female patient ratio of 3:2. A total of 243 (72%) had a Milch II fracture and the fracture was displaced by > 2 mm in 228 (68%). In all, 235 patients underwent K-wire fixation and 101 had screw fixation. . Results. There was a higher rate of nonunion with K-wire fixation (p = 0.02). There was no difference in Baumann’s angle, carrying angle or the rate of major complications between the two groups. No benefit was obtained by immobilizing the elbow for more than four weeks in either group. No short-term complications were seen when fixation crossed the lateral ossific nucleus. Conclusions. Fixation of lateral condylar humeral fractures in children using either K-wires or screws gives satisfactory results. Proponents of both techniques may find justification of their methods in our data, but prospective, randomized trials with long-term follow-up are required to confirm the findings, which suggest a higher rate of nonunion with K-wire fixation. Cite this article: Bone Joint J 2018;100-B:387–95

Aims. The aim of this study was to compare the clinical effectiveness of Kirschner wire (K-wire) fixation with locking-plate fixation for patients with a dorsally displaced fracture of the distal radius in the five years after injury. Patients and Methods. We report the five-year follow-up of a multicentre, two-arm, parallel-group randomized controlled trial. A total of 461 adults with a dorsally displaced fracture of the distal radius within 3 cm of the radiocarpal joint that required surgical fixation were recruited from 18 trauma centres in the United Kingdom. Patients were excluded if the surface of the wrist joint was so badly displaced it required open reduction. In all, 448 patients were randomized to receive either K-wire fixation or locking-plate fixation. In the K-wire group, there were 179 female and 38 male patients with a mean age of 59.1 years (19 to 89). In the locking-plate group, there were 194 female and 37 male patients with a mean age of 58.3 years (20 to 89). The primary outcome measure was the patient-rated wrist evaluation (PRWE). Secondary outcomes were health-related quality of life using the EuroQol five-dimension three-level (EQ-5D-3L) assessment, and further surgery related to the index fracture. Results. At 12 months, 402/448 participants (90%) recruited into the main study provided PRWE scores. At year two, 294 participants (66%) provided scores; at year five, 198 participants (44%) provided scores. There was no clinically relevant difference in the PRWE at any point during the five-year follow-up; at five years, the PRWE score was 8.3 (12.5) in the wire group and 11.3 (15.6) in the plate group (95% confidence interval -6.99 to 0.99; p = 0.139). Nor was there a clinically relevant difference in health-related quality of life. Only three participants had further surgery in the five years after their injury (one in the wire group and two in the plate group). Conclusion. This follow-up study continues to show no evidence of a difference in wrist pain, wrist function, or quality of life for patients treated with wires versus locking plates in the five years following a dorsally displaced fracture of the distal radius. Cite this article: Bone Joint J 2019;101-B:978–983

Recent researches indicate that both M1 and M2 macrophages play vital roles in tissue repair and foreign body reaction processes. In this study, we investigated the dynamics of M1 macrophages in the induced membrane using a mouse femur critical-sized bone defect model. The Masquelet method (M) and control (C) groups were established using C57BL/6J male mice (n=24). A 3mm-bone defect was created in the right femoral diaphysis followed by a Kirschner wire fixation, and a cement spacer was inserted into the defect in group M. In group C, the bone defect was left uninserted. Tissues around the defect were harvested at 1, 2, 4, and 6 weeks after surgery (n=3 in each group at each time point). Following Hematoxylin and eosin (HE) staining, immunohistochemical staining (IHC) was used to evaluate the CD68 expression as a marker of M1 macrophage. Iron staining was performed additionally to distinguish them from hemosiderin-phagocytosed macrophages. In group M, HE staining revealed a hematoma-like structure, and CD68-positive cells were observed between the spacer and fibroblast layer at 1 week. The number of CD68-positive cells decreased at 2 weeks, while they were observed around the new bone at 4 and 6 weeks. In group C, fibroblast infiltration and fewer CD68-positive cells were observed in the bone defect without hematoma-like structure until 2 weeks, and no CD68-positive cells were observed at 4 and 6 weeks. Iron staining showed hemosiderin deposition in the surrounding area of the new bone in both groups at 4 and 6 weeks. The location of hemosiderin deposition was different from that of macrophage aggregation. This study suggests that M1 macrophage aggregation is involved in the formation of induced membranes and osteogenesis and may be facilitated by the presence of spacers

Introduction and Aims: A retrospective review of the medical records and radiographs of patients treated with operative fixation of two-part proximal humerus fractures was undertaken to compare the results of different modes of fixation. Comparison was made between ORIF with a blade plate, percutaneous Kirschner wire fixation, and intramedullary nail fixation utilising a Polarus nail. Method: Thirty-six patients were treated with intramedullary fixation, 11 with blade plate fixation and 10 with percutaneous fixation, utilising Kirschner wires. Union rates were 34/36 (94%) for the Polarus nail, 9/10 (90%) for K-wire fixation and 9/11 (82%) for blade plate fixation. Time to union averaged 12.4 weeks for the Polarus nail, 11 weeks for K-wire fixation and 21 weeks for blade plate fixation. Average active shoulder range of motion in forward flexion/abduction were 125/118 degrees for intramedullary nail, 132/132 degrees for the blade plate and 112/111 degrees for patients treated with K-wire fixation. Results: The major discrepancy in comparison of the different modes of fixation was in the complication rate. Ten complications occurred in the group treated with intramedullary fixation. These included one non-union, one painless fibrous non-union and back out of the proximal interlocking screw in eight patients, five of which required screw removal. Seven of 11 patients treated with blade plate fixation experienced complications, including two non-unions, two malunions, two with functionally limiting heterotopic ossification, one arthrofibrosis and one with persistent pain. The complications associated with percutaneous Kirschner wire fixation included one non-union, two malunions, four developed functionally limiting heterotopic ossification, five incidences of early pin removal secondary to pin migration, one arthrofibrosis requiring surgical intervention and one infection requiring surgical irrigation and debridement. Conclusion: Results comparable in all groups. Fewer complications seen with intramedullary fixation. Majority of complications with Polarus nail related to backing out of proximal interlocking screw. Modification of implant to include end cap, which locks the proximal screw seems to eliminate complication. Results indicate that intramedullary nail fixation is superior to blade plate fixation or pecutaneous Kirschner wire fixation for two-part proximal humerus fractures

Aims. With the ageing population, fragility fractures have become one of the most common conditions. The objective of this study was to investigate whether microbiological outcomes and fracture-healing in osteoporotic bone is worse than normal bone with fracture-related infection (FRI). Methods. A total of 120 six-month-old Sprague-Dawley (SD) rats were randomized to six groups: Sham, sham + infection (Sham-Inf), sham with infection + antibiotics (Sham-Inf-A), ovariectomized (OVX), OVX + infection (OVX-Inf), and OVX + infection + antibiotics (OVX-Inf-A). Open femoral diaphysis fractures with Kirschner wire fixation were performed. Staphylococcus aureus at 4 × 10. 4. colony-forming units (CFU)/ml was inoculated. Rats were euthanized at four and eight weeks post-surgery. Radiography, micro-CT, haematoxylin-eosin, mechanical testing, immunohistochemistry (IHC), gram staining, agar plating, crystal violet staining, and scanning electron microscopy were performed. Results. Agar plating analysis revealed a higher bacterial load in bone (p = 0.002), and gram staining showed higher cortical bone colonization (p = 0.039) in OVX-Inf compared to Sham-Inf. OVX-Inf showed significantly increased callus area (p = 0.013), but decreased high-density bone volume (p = 0.023) compared to Sham-Inf. IHC staining showed a significantly increased expression of TNF-α in OVX-Inf compared to OVX (p = 0.049). Significantly reduced bacterial load on bone (p = 0.001), enhanced ultimate load (p = 0.001), and energy to failure were observed in Sham-Inf-A compared to Sham-Inf (p = 0.028), but not in OVX-Inf-A compared to OVX-Inf. Conclusion. In osteoporotic bone with FRI, infection was more severe with more bone lysis and higher bacterial load, and fracture-healing was further delayed. Systemic antibiotics significantly reduced bacterial load and enhanced callus quality and strength in normal bone with FRI, but not in osteoporotic bone. Cite this article: Bone Joint Res 2022;11(2):49–60