Aim: Volar locking plates are increasingly used in the management of distal radius fractures. As with any new implant, understanding the rate and type of potential metalwork related complications is important. The aim of the study was to determine the type and rate of implant related complications that require further surgery when using volar locking plates in the management of distal radius fractures.

Methods: In this study, we reviewed 114 distal radius fractures treated with volar locking plating. Patient records were reviewed with regards to demographics, operative details and post-operative outcomes. Fractures were classified as intra-articular or extra-articular. They were further classified using the AO classification system

Results: In our series, 12 cases (10%) underwent further surgery for metal work related complications mainly for screw protrusion into the radiocarpal joint following fracture collapse. Intra-articular fractures had a significantly greater complication rate as compared to extra-articular ones (11 vs. 1, P=0.04). There was no significant difference between the three plating systems used in this series with regards to need of further surgery (P=0.43). There was no significant difference between the grade of the operating surgeon with regards to metal work complications (P=0.9). There was no difference in rate of complications between males and females (P=0.27). Similarly there was no difference in metal work complications between patients aged less than 60 as compared to those aged more than 60 years (P=0.58). Our study has shown that volar locking plates may be associated with up to 10% rate of metalwork complications requiring revision surgery. The most common (8 out of 12) cause of re-operation was to remove the screws protruding into the radio-carpal joint.

Discussion: Our results suggest that volar locking plates are associated with a high rate of metal work related complications requiring further surgery. In conclusion our study suggests that volar locking plates are associated with high reoperation rates for implant related complications. Intraoperative screening to ensure that there is no intrarticular penetration is also essential. We favour obtaining intra-operatively a lateral view with the forearm elevated 15–20 degrees to the horizontal plane to allow for the medial-lateral radial inclination and taking the posterior-anterior view at about 20 degrees to the horizontal plane to allow for the normal volar distal radial tilt.

We feel that for a common fracture such as distal radial fractures an ideal implant should be easily reproducible with a low complication rate.

Purpose: Injury to the distal radioulnar joint can result in ulna sided wrist pain and instability. Stabilisation of the distal radioulnar ligaments described by Adams and Berger uses a tendon graft run along the anatomical course of the distal radioulnar ligaments from the lip of the radial sigmoid notch to the fovea of the ulna. The graft wraps around the ulna head and is fixed with a simple suture; this can be challenging for the surgeon and requires a considerable length of tendon. The length of graft required could be reduced by fixing the graft directly to the ulna. Alternative fixation methods when the graft is short would include bone anchors and interference screws.

We therefore compared the fixation strength achieved with simple suture, by bone anchor and by interference screw (Mini Bio-suture Tack and 3mm Biotenodesis interference screw, Arthrex, UK).

Methods: Four ulna bones were harvested along with four corresponding tendons. Tendons were divided into 2mm wide strips and run through a 3.5mm hole in the ulna. Maximum load was measured after fixing the tendon with 1) simple suture, 2) a bone anchor, and 3) an interference screw. Paired data was tested with the paired T-test and Wilcoxon test.

Results: Maximum load recorded was highest for the Mini Bio-Suture Tack bone anchor (99.28 ± 47.39) followed by the simple suture method (96.23 ± 24.14 N), and the Biotenodesis interference screw (46.90 ± 11.29). Differences approached significance when comparing simple suture fixation with interference screws (p=0.02/0.068).

Conclusions: No study has investigated the use of interference screws to secure two tendons in one graft tunnel. Previous work using a single graft and a single tendon has consistently shown that interference screws are superior to other methods of fixation. However, when performing Adam’s procedure for stabilisation of the distal radioulnar joint suturing the tendon together or using a bone anchor provide the greatest fixation strength. This might be due to loss of the interference effect when placing two grafts in the tunnel.

Introduction: The Polarus nail is used in the treatment of displaced surgical neck of humerus fractures, but has been reported to have a high hardware complication rate. A recent change to 5.3 mm “non-toggling” proximal locking screws has been introduced in an attempt to minimise these complications.

The aims of this study were to determine union rates and hardware complications, and to assess whether the “non-toggle” proximal locking option prevented screw back-out.

Methods: We performed a retrospective review of case notes and radiographs of consecutive patients treated with the 150 mm length Polarus nail for acute displaced surgical neck of humerus fractures at our unit between 1st May 2002 and 29th February 2008. All patients were followed up until fracture union.

Results: Forty-nine patients were treated with the Polarus nail during the study period. Eleven patients were lost to follow-up before fracture union, so were excluded. Median age of the patients was 72 years (range: 31 to 94 years). Mean time to surgery was 10.7 days (range: two to 25 days).

Thirty-six fractures (95%) went on to unite following treatment with the Polarus nail. Of the two fractures that failed to unite one had an infective non-union and the other developed avascular necrosis with non-union of the surgical neck.

Twelve patients (32%) developed post-operative hardware complications. In nine (24%) there was backing out of the proximal locking screws, but only two patients had symptoms requiring screw removal. In five patients (13%) the nail was prominent proximally, causing impingement. In one patient (3%) the proximal screws penetrated the gleno-humeral joint, although this was asymptomatic.

There was backing-out in six of the 21 patients (29%) in which the standard 5.0 mm proximal locking screws were used. This compared with three out of 14 patients (21%) in which the 5.3 mm “non-toggling” screws were used. The difference in the rate of screw backing-out between the two groups was significant (P = 0.0474, Fisher’s Exact test). In three patients a mixture of 5.0 and 5.3 mm screws was used.

Discussion: The Polarus nail provides a stable fixation to union when used for the treatment of displaced surgical neck of humerus fractures. It is associated with a high hardware complication rate (32%), however, this is asymptomatic in the majority of cases (60%). The 5.3 mm “non-toggle” proximal locking option was found to reduce the rate of screw back-out compared with the standard 5.0 mm screw. We recommend the use of this “non-toggling” screw option for proximal locking.