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Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_9 | Pages 23 - 23
16 May 2024
McCormack D Kirmani S Aziz S Faroug R Solan M Mangwani J
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Background

Supination-external rotation (SER) injuries make up 80% of all ankle fractures. SER stage 2 injuries (AITFL and Weber B) are considered stable. SER stage 3 injury includes disruption of the posterior malleolus (or PITFL). In SER stage 4 there is either medial malleolus fracture or deltoid injury too. SER 4 injuries have been considered unstable, requiring surgery. The deltoid ligament is a key component of ankle stability, but clinical tests to assess deltoid injury have low specificity. This study specifically investigates the role of the components of the deep deltoid ligament in SER ankle fractures.

Aim

To investigate the effect of deep deltoid ligament injury on SER ankle fracture stability.


Orthopaedic Proceedings
Vol. 97-B, Issue SUPP_14 | Pages 26 - 26
1 Dec 2015
Baumhauer J Singh D Glazebrook M Blundell C Wansbrough G de Vries G Le I Nielson D Petersen E Sakellariou A Solan M Younger A Daniels T
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Patients with advanced stage hallux rigidus from 12 centers in Canada and the UK were randomized (2:1) to treatment with a small (8/10 mm) hydrogel implant (Cartiva) or 1st MTP arthrodesis. VAS pain scale, validated outcome measures (FAAM sport scale), great toe active dorsiflexion motion, secondary procedures, radiographic assessment and safety parameters were evaluated.

236 patients were initially enrolled, 17 patients withdrew prior to randomization, 17 patients withdrew after randomization and 22 were non-randomized training patients, leaving 152 implant and 50 arthrodesis patients. Standard demographics and baseline outcomes were similar for both groups.

Mean VAS pain scores decreased from 6.8 and 6.9 respectively for the implant and arthrodesis groups from baseline to 1.4 and 0.7 at 24 months. Similarly, the FAAM sports score improved significantly from baseline levels of 37 and 36 to 24 months level of 77 and 82 respectively for the implant and arthrodesis groups. First MTP active dorsiflexion motion improved an average of 4° at 3 months after implant placement and was maintained at 24 months.

Secondary surgeries occurred in 17 (11.2%) implant patients and 6 (12.0%) arthrodesis patients. Fourteen (9.2%) implants were removed and converted to arthrodesis and 6 (12.0%) arthrodesis patients had painful hardware requiring removal. There was no case of implant fragmentation, wear, or bone loss. Analysis of a single composite endpoint utilizing the three primary study outcomes (pain, function, and safety) showed statistical equivalence between the2groups.

Conclusion

In patients requiring surgery for advanced stage hallux rigidus, treatment with a small synthetic cartilage implant resulted in comparable clinically important pain relief and functional outcomes compared to 1st MTP arthrodesis while preserving and often improving great toe motion. Secondary surgical intervention was similar in the implant and arthrodesis groups. Revision from a small implant plug to arthrodesis can be performed if needed.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_18 | Pages 10 - 10
1 Dec 2014
Ghosh K Robati S Shaheen A Solan M
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The MediShoe (Promedics Orthopaedics Ltd, Glasgow) is a specific post-operative foot orthosis used by post-operative foot and ankle patients designed to protect fixations, wounds and maximise comfort. The use of rigid-soled shoes has been said to alter joint loading within the knee and with the popular use of the MediShoe at our centre in post operative foot and ankle surgery patients, it is important to ascertain whether this is also true.

An analysis of the knee gait kinetics in healthy subjects wearing the MediShoe was carried out. Ten healthy subjects were investigated in a gait lab both during normal gait (control) and then with one shoe orthosis worn. Force plates and an optoelectronic motion capture system with retroreflective markers were used and placed on the subjects using a standardised referencing system. Three knee gait kinetic parameters were measured:- knee adduction moment; angle of action of the ground reaction force with respect to the ground in the coronal plane as well as the tibiofemoral angle. These were calculated with the Qualisys software package (Gothenburg, Sweden).

A two-tailed paired t-test (95% CI) showed no significant difference between the control group and the shoe orthosis-fitted group for the knee adduction moment (p = 0.238) and insignificant changes with respect to the tibiofemoral angle (p = 0.4952) and the acting angle of the ground reaction force (p = 0.059).

The MediShoe doesn't significantly alter knee gait kinetics in healthy patients. Further work, however is recommended before justifying its routine use.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_1 | Pages 11 - 11
1 Jan 2013
Gurdezi S Kohls-Gatzoulis J Solan M
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Background

Most patients with Achilles tendinopathy (AT) are treated successfully with physiotherapy ie eccentric calf training. In some patients gastrocnemius contracture persists. Three other publications have reported improvement in AT following gastrocnemius release, but this is the first series of patients to have proximal medial gastrocnemius release (PMGR) for AT. The purpose of this study was to review patients with refractory non-insertional and insertional AT treated by PMGR with a minimum followup of 18 months.

Method

Sixteen PMGRs were performed over a two year period. Nine patients (10 PMGRs) were available for followup. The mean age of patients was 45 (Range, 25 to 63) years, with five female and four male subjects. The average followup period was 2.5 (range, 1.7 to 3.3) years. The sample was divided into non-insertional and insertional tendinopathy, with five PMGRs per group. Outcome measures were VAS scores, VISA-A scores, AOFAS ankle-hindfoot score and overall satisfaction. Complications and further procedures were also recorded.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_1 | Pages 192 - 192
1 Jan 2013
Rogers B Little N Solan M Ricketts D
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Introduction

Entry into orthopaedic higher surgical training remains extremely competitive, however little evidence exists regarding the validity of short-listing and interviewing for selection. This paper assesses the relative correlations of short-listing and interview scores in predicting subsequent performance as an orthopaedic trainee.

Methods

We compared data from the selection process (short-listing and interview scores) to subsequent performance during training (academic output and an annual assessment score by Programme Director). Data was prospectively collected from 115 trainees on the South West Thames region of the U.K. during 2000–2010.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XLIII | Pages 8 - 8
1 Sep 2012
Ieong E Afolayan J Little N Pearce C Solan M
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Introduction

Scar sensitivity is a recognised complication of foot surgery. However there is very little published about it. This study looks at the incidence and natural history of scar sensitivity following hallux valgus surgery.

Materials and Methods

Patients who had open hallux valgus surgery from December 2008 to December 2009, with a minimum follow up of 12 months, were contacted. Data regarding scar symptoms, their duration, severity at their worst and interventions undertaken were collected. Patients also completed a Roles and Maudsley patient satisfaction score.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXIX | Pages 67 - 67
1 Sep 2012
Marsland D Little N Dray A Solan M
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The saphenous nerve is classically described as innervating skin of the medial foot extending to the first MTP joint and thus is at risk in surgery to the medial ankle and forefoot. However, it has previously been demonstrated by the senior author that the dorsomedial branch of the superficial peroneal nerve consistently supplies the dorsomedial forefoot, leading to debate as to whether the saphenous nerve should routinely be included in ankle blocks for forefoot surgery. We undertook a cadaveric study to assess the presence and variability of the saphenous nerve.

29 feet were dissected from a level 10 cm above the medial malleolus, and distally to the termination of the saphenous nerve. In 24 specimens (83%), a saphenous nerve was present at the ankle joint. In 5 specimens the nerve terminated at the level of the ankle joint, and in 19 specimens the nerve extended to supply the skin distal to the ankle. At the ankle, the mean distance of the nerve from the tibialis anterior tendon and saphenous vein was 14mm and 3mm respectively. The mean distance reached in the foot was 5.1cm. 28% of specimens had a saphenous nerve that reached the first metatarsal and no specimens had a nerve that reached the great toe.

The current study shows that the course of the saphenous nerve is highly variable, and when present usually terminates within 5cm of the ankle. The saphenous nerve is at risk in anteromedial arthroscopy portal placement, and should be included in local anaesthetic ankle blocks in forefoot surgery, as a significant proportion of nerves supply the medial forefoot.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXIX | Pages 54 - 54
1 Sep 2012
Ieong E Afolayan J Carne A Solan M
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Introduction

Plantar fasciopathy is a common cause of heel pain, and is usually treated in primary practice with conservative measures. Intractable cases can prove very difficult to treat. Currently plantar fasciopathy is not routinely imaged and treatment is empirical. At the Royal Surrey County Hospital patients with intractable plantar fasciopathy are managed in a unique ‘one-stop’ Heel Pain clinic. Here they undergo clinical assessment, ultrasound scanning and targeted therapy.

Methods

Patients referred to the clinic since 2009, with symptoms lasting longer than 6 months and failed conservative management, were prospectively followed. Plantar fasciopathy was confirmed on ultrasound scanning. The ultrasound scans were used to classify the disease characteristics of the plantar fascia.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XLIII | Pages 23 - 23
1 Sep 2012
Malik A Wright B Mann B Saini A Solan M
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Introduction

Foot and ankle is a well-established and growing sub specialty in orthopaedics. It accounts for 20 to 25 per cent of an average department's workload. There are two well established foot and ankle specialist journals but for many surgeons the Journal of Bone and Surgery (JBJS) remains the preeminent journal in orthopaedics and a highly sought after target journal for publication of research. It is our belief that foot and ankle surgery is underrepresented in the JBJS. We undertook a study to test this hypothesis.

Methods

We analysed all JBJS (British and American editions) volumes over a 10 year period (2001 to 2010). We recorded how many editorials, reviews, original papers and case reports were foot and ankle related.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XLIII | Pages 28 - 28
1 Sep 2012
Marsland D Dray A Little N Solan M
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The saphenous nerve is classically described as innervating skin of the medial foot to the first MTP joint and thus is at risk in surgery to the medial ankle and foot. However, it has previously been demonstrated that the dorsomedial branch of the superficial peroneal nerve consistently supplies the dorsomedial forefoot, and therefore previous descriptions of the saphenous nerve maybe erroneous.

We undertook a cadaveric study to assess the presence and variability of this nerve.

21 cadaveric feet were dissected from a level 5 cm above the medial malleolus, and distally to the termination of the saphenous nerve. In 16 specimens (76%), a saphenous nerve was present, of which 14 were anterior to the saphenous vein. Two of 16 nerves terminated above the medial malleolus. Therefore, only 14 of 21 specimens (66%) had a saphenous nerve present at the level of the medial malleolus. In seven of these 14 specimens (50%), the nerve terminally branched before the level of the tip of the malleolus. The mean distance reached in the foot was 46mm. Only two nerves reached the forefoot, at 97mm and 110 mm from the ankle joint respectively. At the ankle, the mean distance of the nerve from the tibialis anterior tendon was 9mm, and the saphenous vein 1.2mm.

Discussion

Our study shows that the course of the saphenous nerve is highly variable, and when present usually terminates within 40mm of the ankle. Only 10% reach the first MTP joint. These findings are inconsistent with standard surgical text descriptions.

The saphenous nerve is at risk in distal tibial screw placement and arthroscopy portal placement, and should be included in local anaesthetic ankle blocks in forefoot surgery, as a small proportion of nerves supply sensation to the medial forefoot.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXII | Pages 12 - 12
1 May 2012
Solan M Carne A
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Heel pain is very prevalent. Pain, especially after a period of rest, is the main symptom. Reduced ability to walk long distances and inability to participate in exercise and sport are other complaints. Plantar heel pain is most commonly caused by plantar fasciitis. Whilst only the recalcitrant cases reach secondary care, this can still be a significant workload. In the Royal Surrey County Hospital, Guildford, we see approximately 200 cases of recalcitrant heel pain each year. The vast majority of cases never come to hospital and are managed in primary care (1500/yr in podiatry alone). Effective primary treatments should reduce the number of long-term sufferers.

Recalcitrant cases of plantar fasciitis often have atypical symptoms. Radiological imaging is extremely useful in clarifying the diagnosis. Ultrasound is our preferred modality. There is a spectrum of pathology that affects the plantar fascia, and this is less well classified than for the achilles tendon, where the distinction between insertional tendinopathy and tendinopathy of the main body of the tendon is helpful in guiding treatment.

The evidence for many forms of treatment for plantar fasciitis is weak. Currently, the use of formal calf stretching programs is widely considered to be the best first-line treatment. There are additional benefits with stretches to the fascia itself. The mechanism by which these stretches help is not well established. Calf contracture is, however, associated with a variety of clinical problems in the foot and ankle. This is especially true for isolated gastrocnemius contracture. There is also laboratory evidence that increased plantar fascia strain is seen with increased calf muscle tension. Surgery to release a gastrocnemius contracture improves biomechanics and has been used in refractory cases of heel pain with good effect.

Radial extracorporeal shock wave lithotripsy is the latest version of this non-invasive treatment. Results in our centre are encouraging. For selected cases of atypical plantar fasciopathy injection treatments are effective.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_IV | Pages 477 - 477
1 Nov 2011
Abbassian A Kohls-Gatzoulis J Solan M
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Background: Isolated Gastrocnemius contracture has been implicated as the cause of a number of foot and ankle conditions. Plantar Fasciitis (PF) is one such condition that can be secondary to altered foot biomechanics as a result of gastrocnemius contracture. We perform an isolated proximal medial head of gastrocnemius release (PMGR) as a day-case procedure. This is to report our results of this procedure in the treatment of recalcitrant PF.

Material and Methods: We prospectively followed a consecutive series of 22 heels in 18 patients following a PMGR. To be included, at least one year of conservative treatment must have been tried and isolated Gastrocnemius contracture confirmed clinically using Silfverskiold’s test pre-operatively. Outcome measures included the visual analogue pain score (VAS) and a 5-point Likert scale of postoperative success. Subjective and objective calf weakness was also evaluated. Final follow up was at an average of 25 months (range: 12 to 36 months) after the surgery.

Results: Two patients were lost to follow up. In the remaining 20 heels the average VAS for pain had improved from 9.4 to 1.8 (P< 0.001). Fourteen heels (70%) were pain free or significantly better at final follow up. There was no objective evidence of calf weakness and only one patient (5%) felt subjectively weaker on the released side. There were no ‘major’ complications and only 2 cases (10%) suffered a ‘minor’ complication. One was a case of superficial wound sepsis and the other was of prolonged calf pain following the surgery. Both resolved spontaneously and without further intervention.

Conclusions: A PMGR is a simple way of treating patients with PF who fail to respond to conservative management. The results, in our series, have been favorable and the morbidity low. We recommend the use of gastrocnemius release once non-operative management has failed.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_III | Pages 300 - 300
1 Jul 2011
Arastu M Partridge R Crocombe A Solan M
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Background: Neglected ruptures of the tendoachilles pose a difficult surgical problem. Intervening scar tissue has to be excised which cannot be repaired by end-to-end anastamosis. Several techniques for reconstruction of chronic ruptures have been described. The flexor hallucis longus (FHL) tendon transfer is considered advantageous over other tendon transfers. One disadvantage of FHL is it has limited excursion. There are no data to determine the optimal positioning of the FHL tendon to the calcaneum.

Materials and Methods: Two computer programmes (MSC.visualNastran Desktop 2002™ and Solid Edge® V19 were used to generate a human ankle joint model. This model is able to reproduce dorsi- and plantarflexion. Different attachment points of FHL tendon transfer to the calcaneum were investigated.

Results: The lowest muscle force to produce plantarflexion (single stance heel rise) was 1355N. Plantarflexion increased for a more anterior attachment point. The maximal plantarflexion was 33.4° for anterior attachment and 24.4° for posterior attachment. There was no significant difference in these figures when the attachment point was moved to either a medial or lateral position.

Clinical relevance: Optimal FHL tendon transfer positioning is a compromise between achieving plantarflexion for normal physiological function versus the force generating capacity and limited excursion of FHL. A more posterior attachment point is advantageous in terms of power. The range of motion is 10° less than when attachment is more anterior, the arc of motion (24.4°) is still physiological. We recommend that FHL is transferred to the calcaneum in a posterior position.


Orthopaedic Proceedings
Vol. 91-B, Issue SUPP_II | Pages 361 - 361
1 May 2009
Kohls-Gatzoulis JA Solan M
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Introduction: Gastrocnemius contracture, as demonstrated by Silfverskiold’s test, is increasingly recognised as an underlying cause of painful disorders of the foot and ankle. Elevated pressure beneath the forefoot and symptoms in the hindfoot and ankle are produced as a result of the biomechanical imbalance. Adaptive shortening of the gastrocnemius can be treated by a supervised stretching program. Night splintage and serial casting are other useful non-operative treatments. Refractory cases may be considered for surgical release of the gastrocnemius.

Materials and Methods: The purpose of this study was to follow-up all those patients who were treated with a medial proximal gastrocnemius release with a minimum follow-up of six months.

Results: Eighty procedures were performed in sixty-five patients. There was one post operative infection. One patient has diminished sensation in the distribution of a branch of the saphenous nerve. There was an improvement in ankle dorsiflexion with the knee extended in all patients. Those patients with heel pain felt their symptoms had improved in the majority of cases.

Discussion: Release of the gastrocnemius aponeurosis at the gastrosoleus junction may be performed open or endoscopically. Both techniques place the sural nerve at risk of injury. Proximal release of the gastrocnemius is an alternative technique. Proponents of this method release both the medial and lateral heads through a single transverse skin incision over the popliteal fossa. It has been postulated that release of the medial head alone is sufficient to overcome the muscle contracture. Advantages of this approach include a smaller skin incision and a surgical field more distant from neurovascular structures.

Conclusion: The proximal medial gatrocnemius release is a safe, well tolerated, and effective procedure for those patients who fail an appropriate stretching program. In selected patients it can be preformed under local anaesthetic and light sedation.


The Journal of Bone & Joint Surgery British Volume
Vol. 90-B, Issue 2 | Pages 186 - 188
1 Feb 2008
Pearce CJ Sexton S Gerrard D Hatrick A Solan M

Chronic infections and ulceration around the tendo Achillis are difficult to manage. Split-skin grafts do not survive even on healthy exposed tendon. Refractory cases may require plastic surgical intervention with the use of free flaps. Patients with significant vascular disease are not suitable for such techniques. Flexor hallucis longus tendon transfer is an established treatment for chronic ruptures of the tendo Achillis.

We report the successful treatment of an infected tendo Achillis with excision and reconstruction with flexor hallucis longus transfer. The muscle belly of this tendon allowed later skin grafting while the tendon transfer provided good functional recovery.


Orthopaedic Proceedings
Vol. 88-B, Issue SUPP_II | Pages 286 - 286
1 May 2006
Hogan N O’Donnell T Solan M Stephens M
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This study reviewed the subjective, clinical, and radiological outcome of 24 patients (31 feet) treated by basal metatarsal osteotomy with a modified McBride procedure for severe (intermetatarsal angle > 150) hallux valgus, carried out at our institution with an average follow-up time of 29 months.

At the time of follow-up, 40% of the patients were very satisfied, 45% were satisfied, and 15% were not satisfied. The mean Hallux – Metatarsophalangeal – Interphalangeal scale score raised significantly from 39 points (17 – 64) pre-operatively, to 82 (39 – 96) points at follow-up (p < 0.001). The Lesser - Metatarsophalangeal – Interphalangeal scale score raised significantly from 46 points (26 – 69) pre-operatively, to 84 (33 – 97) points at follow-up (p < 0.001). The radiological angles, including M1-M2, M1-P1, M1-M5, and DMAA improved significantly (p < 0.001). 12 of these cases had a M1-M2 angle post correction > 15°. Among the 9 complications recorded, 7 were minor and 2 required an additional procedure.

The basal metatarsal osteotomy coupled with a modified McBride procedure resulted in an overall high satisfaction rate, as well as significant clinical and radiological improvements in our series. Nevertheless, the range of motion of the first MTP joint remained low: 30 – 75° in 67% and < 30° in 6%. Furthermore, the failure to correct the M1-M2 angle to < 15° in 12 cases was probably due to the severe nature of the M1-M2 angle in these patients pre-operatively (21–33°).

Basal metatarsal osteotomy with a modified McBride procedure remains a safe procedure with excellent results, both subjectively and objectively, in patients with severe hallux valgus


Orthopaedic Proceedings
Vol. 85-B, Issue SUPP_III | Pages 249 - 249
1 Mar 2003
Bishop T Molloy S Solan M Elliott D Newman K
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Traditionally, immobilisation following achilles tendon rupture has been for 10 to 12 weeks.

We have previously published a series of 71 consecutive repairs with no re-ruptures, using a lateral surgical approach. The latter part of this cohort were immobilised for six weeks instead of 12, with early weight bearing. The lack of any re-ruptures encouraged us to pursue the accelerated rehabilitation.

This study documents a further 34 cases followed prospectively for 6–24 months (mean 15.9 months). All were repaired with a single Kessler-type suture using loop PDS, through a lateral approach. Patients were partial weight-bearing immediately in an Aircast boot with three cork heel wedges. At two-weekly intervals the wedges were reduced, and the boot abandoned after six weeks.

There have been no re-ruptures. Thirty of the 34 patients returned to pre-injury activity levels. All patients were satisfied or very satisfied with the immobilisation device and the accelerated rehabilitation regime. Cost savings were also made through use of a single removable orthosis rather than sequential casts.

We advocate this regimen of careful operative achilles tendon repair and accelerated weight bearing rehabilitation with a removable orthosis.


Orthopaedic Proceedings
Vol. 85-B, Issue SUPP_III | Pages 244 - 244
1 Mar 2003
Bishop T Molloy S Solan M Elliott D Newman K
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Traditionally, immobilisation following Achilles tendon rupture has been for 10 to 12 weeks.

We have previously published a series of 71 consecutive repairs with no re-ruptures, using a lateral surgical approach. The latter part of this cohort were immobilised for six weeks instead of 12, with early weight bearing. The lack of any re-ruptures encouraged us to persue the accelerated rehabilitation.

This study documents a further 34 cases followed prospectively for 6–24 months (mean 15.9 months). All were repaired with a single Kessler-type suture using loop PDS, through a lateral approach. Patients were partial weight-bearing immediately in an Aircast boot with three cork heel wedges. At two-weekly intervals the wedges were reduced, and the boot abandoned after six weeks.

There have been no re-ruptures. Thirty of the 34 patients returned to pre-injury activity levels. All patients were satisfied or very satisfied with the immobilisation device and the accelerated rehabilitation regime. Costs savings were also made through use of a single removable orthosis rather than sequential casts.

We advocate this regimen of careful operative achilles tendon repair and accelerated weight bearing rehabilitation with a removable orthosis.


Orthopaedic Proceedings
Vol. 85-B, Issue SUPP_III | Pages 247 - 247
1 Mar 2003
Molloy S Burkhart B Jasper L Solan M Campbell J Belkoff S
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Aims and methods

To compare the mechanical stability of an intramedullary (IM) screw with two crossed interfragmentary compression screws for fixation of the 1st MTPJ in ten pairs of cadaveric feet. One foot underwent fixation with two crossed 4.0-mm cannulated cancellous screws. The contralateral foot was fixed with an IM 1.6-mm Kirschner wire and an IM 6.5-mm partially threaded cancellous lag screw. A plantar-to-dorsal load was applied to the distal end of the proximal phalanx at a rate of 1 mm/sec. Failure was defined as gross actuator displacement of 5 mm. Stiffness was defined as the slope of the force versus deformation curve between 10 and 60 N. Strength was defined as the load at failure. The differences in stiffness and strength parameters between the two fixation techniques were checked for significance (P < 0.05) with a paired t-test.

Results

The intramedullary MTP joint fixation was significantly stiffer (18.7 ± 10.1 N/mm) than control group fixation (10.2 ± 6.1 N/mm). Similarly MTP joint fixation in the IM group was stronger (149.2 ± 88.2 N) than that of the control group (100.2 ± 70.8 N), but this was not significant (P = 0.07).

Conclusions

The IM technique resulted in a stronger stiffer fixation when compared with the standard crossed lag screw technique.


Orthopaedic Proceedings
Vol. 85-B, Issue SUPP_II | Pages 126 - 126
1 Feb 2003
Solan M Bendall S Jasper L Jinnah R Belkoff S
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Introduction

The strength of the Scarf osteotomy has been compared to that of other metatarsal osteotomies, but the effect of increasing the amount of displacement is unknown. The purpose of this study was to determine whether increasing offset adversly affects the strength of the Scarf osteotomy.

Methods

Seven pairs of freah frozen cadaveric feet were tested. Specimens in Group 1 underwent Scarf osteotomy with displacement of one third the mid shaft diameter. Specimens in Group 2 were offset two thirds the midshaft diameter. All osteotomies were fixed using two Barouk screws.

Each specimen was tested in cantilever bending using a servohydraulic testing machine.

Results

There was no statistically significant difference in strength or stiffness between the two groups. Mean strength was 75.2 N ± 16.8 for Group 1 and 64.8 N ± 28.7 for Group 2 (p> 0.05).

Mean stiffness was 12.9 N/mm ± 5.1 for Group I and 10.2 N/mm ± 5.9 for Group 2 (p> 0.05).

Discussion

All specimens failed at the proximal extent of the osteotomy. Failure did not occur by screw pullout in either Group. The proximal part of the cut is therefore the weakest part of the construct irrespective of the degree of osteotomy displacement.