Abstract

Purpose: We conducted a study of 72 hammer toes treated with proximal interphalangaeal joint (PIPJ) fusions with a Stayfuse implant. The aim of the study was to access the clinical results of PIPJ fusion carried out with Stayfuse implants.

Method: There were 10 males and 62 females. Average age was 52 years. Twelve cases had bilateral and 60 cases had unilateral foot involvement. Fifty-two second and 20 third toes were operated on. Mean follow up was twelve months. The results were assessed clinically, radiologically and with the American orthopaedic foot and ankle surgery society (AOFAS) score.

Results: All the joints fused clinically except two. There were ten PIPJ’s which did not fuse radiologically. The AOFAS score improved from 42 preoperativley to 84 post operatively. There were two cortical breeches of the proximal phalanx, one implant breakage and one case of dissociation of the components of the implant at six weeks after the surgery, with a recurrence of deformity. There were two patients who complained of over-straight toes. Fifty-two patients were very satisfied with the procedure, seventeen satisfied and three patients were unsatisfied.

Conclusion: We conclude that the Stayfuse is safe, reliable method to correct PIPJ deformity, although there is a learning curve. The main advantages of the implant are that there is no postoperative implant exposure, no violation of healthy joints, no risk of pin tract infection, rotational and angular stability, early rehabilitation and a high patient satisfaction. The disadvantages of the implant are dissociation of the components and the difficulty of removal, if this is needed.

Introduction: Various techniques are being currently used for the internal fixation of scarf osteotomies. We conducted a prospective study on 23 consecutive cases of hallux valgus treated with scarf osteotomy, which was internally fixed with AO mini fragment screws. The aim of our study was to evaluate the clinical efficacy of the AO mini fragment screws in these cases.

Method: Sixteen women and one man (twenty three feet) were included in our study. Mean age was 46 years at the time of surgery. The mean follow-up time was 18 months. A single surgeon performed surgery. Patients were assessed by clinical and radiological evaluation. Preoperative and postoperative American Orthopaedic Foot and Ankle Society score was obtained.

Results: All the osteotomies united without any failure of fixation or hard ware problems. One patient developed superficial wound infection, which responded to antibiotics. At the time of follow-up all the patients were very satisfied. The mean AOFAS score improved significantly from 55 points pre-operatively to 91.95 at follow-up (p < 0.001). The intermetatarsal and hallux valgus angles improved from the mean pre-operative values of 15.86° and 31.18 degrees to 9.09° and 15.18°, respectively. These improvements were significant (p < 0.0001).

Conclusion: We report no failure of fixation in our series and conclude that this is a safe and simple technique. It is cost effective, provides stable fixation and maintains correction till the union of osteotomy.

Displaced proximal humeral fractures remain a difficult management problem. There are many treatment methods described in the literature but there is no universally accepted technique.

Materials and Methods We treated 25 patients with displaced fractures of the proximal humerus by internal fixation with a locked Polarus nail at our hospital over a period of 4 years. The male: female ratio was 13:12. The average age was 63 yrs and the average follow-up in the series was 24 months. Fracture union was evaluated by regular clinical and radio graphic examination. The functional outcome was assessed by Constant’s score.

Results In 23 patients, the fracture united while one patient had failure of the proximal fixation due to collapse of the head requiring a shoulder replacement. One patient died post-operatively due to medical conditions. There were no wound infections in our series; two patients had temporary radial nerve palsy. There were three patients in which one of the proximal locking screws was missing the nail. There was backing out of proximal locking screws in four patients which required removal. One patient required removal of the nail due to impingement symptoms. There was no difference in the Constant’s score in the young and the elderly population. 75% of the patient’s were satisfied with their functional outcome.

Discussion In our limited experience, Polarus nail is an effective mechanical device for the treatment of unstable proximal humeral fractures. The proximal locking screws are often seen to back out in elderly population and they may require removal if symptomatic. This appears to be due to poor grip of screws in osteoporotic bone. In order to minimise the risk of proximal screws missing the nail we recommend the nail insertion device should be assembled by the surgeon himself before insertion into the patient and check to make sure the holes in the jig match those in the nail. In our hands we found that the entry point is very critical and we feel that it should be as medial as possible to preserve the lateral metaphysis. Our study shows that Polarus nail is an effective device to treat displaced proximal humeral fractures but the fracture communition and bone quality also plays a role in the outcome of such fractures.

Aiming to evaluate the efficacy and safety of instrumentation using only segmental pedicle screw fixation, we undertook a prospective study of 17 patients with idiopathic scoliosis who underwent corrective surgery in 1998 and 1999.

A total of 170 pedicle screws was inserted, 119 in the thoracic spine and 51 in the lumbar, extending from T2 to L5. The Cobb angle was measured on an erect anteroposterior radiograph postoperatively and at 6 and 12-month follow-up. Pedicle screw placement was assessed on the radiographs, and where there was concern about screw position, CT scan was performed.

Of the 170 pedicle screws, three were malpositioned lateral to the pedicle and one medial to the pedicle. One pedicle fractured during screw insertion, and three screws partially pulled out on the convex side of the curve at T3 to T5. At six months the mean Cobb angle correction was 53.6%. There were no neurological complications. Two cases required subsequent trimming of rods.

We believe fixation using only segmental pedicle screws is a safe method of correcting idiopathic scholastic deformities, but retain some reservations about the pull-out strength of the uppermost screws in the thoracic spine.