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PubMed1991

Results of leg lengthening using Wagner's technique.

Nineteen leg lengthenings by Wagner's technique were reviewed. Average patient age was 13 years (range, 8-18 years). The gain averaged 3.9 cm (range, 1.1-10 cm). Complications were prolonged treatment period (9 cases), metal-work failure (6), loss of gain (5), malunion (6), fracture (5), deep infection (2), and joint problem (6). The osteogenesis in the elongation gaps affected the results. No callus formation by 40 days after osteotomy and no bridging callus by the end of elongation period were warning signs of poor osteogenesis. All tibial lengthenings and femoral lengthenings of more than 5 cm or 13% of the original length were at risk of poor osteogenesis. Proper stabilization and bone grafting were the most effective measures for poor osteogenesis. Currently, Wagner's technique is not the treatment of choice because new techniques with fewer complications are available. However, Wagner's technique is useful in the cases to which the new procedures are not applicable.

Adolescent↗
PubMed1999

Leg lengthening over an intramedullary nail.

Distraction osteogenesis is widely used for leg lengthening, but often requires a long period of external fixation which carries risks of pin-track sepsis, malalignment, stiffness of the joint and late fracture of the regenerate. We present the results of 20 cases in which, in an attempt to reduce the rate of complications, a combination of external fixation and intramedullary nailing was used. The mean gain in length was 4.7 cm (2 to 8.6). The mean time of external fixation was 20 days per centimetre gain in length. All distracted segments healed spontaneously without refracture or malalignment. There were three cases of deep infection, two of which occurred in patients who had had previous open fractures of the bone which was being lengthened. All resolved with appropriate treatment. This method allows early rehabilitation, with a rapid return of knee movement. There is a lower rate of complications than occurs when external fixation is used on its own. The time of external fixation is shorter than in other methods of leg lengthening. The high risk of infection calls for caution.

Adolescent↗
PubMed1996

Leg lengthening in Turner dwarfism.

We have reviewed 16 patients treated by leg lengthening for various forms of Turner dwarfism with regard to the long period of healing and the complications. We consider that Turner dwarfism is a suitable indication for leg lengthening because of the moderate length deficit and the morphological appearance of the patients, and have introduced an improved programme of management to deal with the problems encountered.

Adolescent↗
PubMed1991

Complications of leg lengthening. 46 procedures in 28 patients.

The results and complications of 46 leg-lengthening procedures in 28 consecutive patients were analyzed retrospectively. There were 24 femoral and 22 tibial lengthenings, performed for short stature (5 patients) and limb-length discrepancy (23 patients). Three methods were used: diaphyseal osteotomy, metaphyseal corticotomy, and distraction physiolysis. In the second group a satisfactory result was obtained more often and a lower complication rate was observed. The overall complication rate was high: 45 substantial problems occurred. We conclude that leg lengthening is difficult, requiring good preoperative examination and planning, and should be carried out only in specialized centers.

Adolescent↗
PubMed1976

[Experience with operative leg lengthening (author's transl)].

The author reports on 175 cases of leg lengthening operations for leg equalisation by means of Wagners and Andersons procedure. None of the occuring complications prevented the operation being successful. So the methods offer an useful alternative to shortening osteotomies and epiphysiodesis.

Adolescent↗
PubMed1996

Stiffness measurements to assess healing during leg lengthening. A preliminary report.

We describe a technique for measuring the stiffness of regenerate bone after leg lengthening. This allows early identification of slow healing by reference to normal patterns. We determined the time of removal of the fixator from clinical and radiological information independent of the stiffness result. In a series of 30 leg lengthenings there were no refractures when the tibial stiffness had reached 15 Nm/degree or the femoral stiffness 20 Nm/degree. Three refractures occurred at lower stiffness values. The technique is simple to perform, will allow a reduction in plain radiography and is recommended for routine postoperative management.

Adolescent↗
PubMed2002

High frequency distraction improves tissue adaptation during leg lengthening in humans.

The present study investigates the effect of distraction frequency on the development of tensile force in the tissues during lengthening. Two patients with bilateral Ilizarov leg lengthening underwent distraction with high frequency in one leg and low frequency in the other. The clinical situation represented a unique model for investigating the effect of distraction frequency, as each individual served as its own control. Both patients had double level lengthening. Distraction frequency at the proximal lengthening zone was 0.25 mm x 4 in the first leg and 1/1440 mm once every minute in the other. Total diurnal distraction at the proximal metaphysis was 1 mm in both legs. In addition, a distal metaphyseal distraction of 0.25 mm x 3 daily was performed on each leg. The tissue's mechanical response was monitored by measuring the tensile force at the proximal osteotomy. Both patients experienced a significant lower level of force during the high frequency lengthening. The lower level of force was concluded to be due to improved soft tissue adaptation, rather than reduced bone regeneration. Accordingly, high distraction frequency was considered favourable to low frequency, and is recommended in large lengthenings where high force levels are expected.

Adaptation, Physiological↗
PubMed1993

New bone formation during leg lengthening. Evaluated by dual energy X-ray absorptiometry.

We measured the extent and rate of new bone formation over an 18-month period before, during and after the lengthening of ten leg segments in six patients aged between 8 and 18 years, using dual-energy X-ray absorptiometry (DEXA). New bone formation could be identified within one week of the start of distraction. As lengthening proceeded, the bone density of the gap fell, reaching minimum values at the time of maximal distraction. Consolidation of the regenerating bone was started 1 to 2 weeks later in the tibia, and 2.5 to 3.0 weeks later in the femur. The rate of mineral accretion in new bone was significantly greater in the tibia than in the femur (16 +/- 1.86%/month, and 11 +/- 1.1%/month respectively; mean +/- SEM). There was significant osteoporosis distal to the osteotomy, more in the tibia than in the femur, particularly on the side of the fixator. The bone mineral density of the distal segment remained low at the time of fixator removal (44.2 +/- 5.58% and 61.0 +/- 4.2% of the control values at the tibia and femur respectively) and was only partially reversed by subsequent weight-bearing. We conclude that dual-energy X-ray absorptiometry provides an objective and quantitative assessment of new bone formation during leg lengthening. The technique also allows the measurement of the distraction gap and the assessment of leg alignment from the high-resolution images. Its use may decrease the requirements for conventional radiography.

Absorptiometry, Photon↗
PubMed1994

Reduction of radiation doses in leg lengthening procedures by means of audit and computed tomography scanogram techniques.

Children with congenital bone dysplasias may benefit from leg lengthening procedures. Such procedures, by necessity, require frequent and regular imaging. It is necessary to minimize the total radiation dose to these patients, and particularly the dose to the gonads. In the present study the films of 13 patients who had completed leg lengthening procedures were reviewed. The number of films was assessed together with the use of appropriate gonad shielding. In a second part of the study, thermoluminescent dosemeter measurements of radiation doses to a phantom were made for both plain radiographs (with and without gonad protection) and computed tomography (CT) scanograms. The results show that audit plays an important role in assessing radiographic practice with respect to accurate placement of gonad protection and confirm that a significant dose reduction can be accomplished by careful use of this lead shielding. Dose reduction can also be achieved by using alternative radiographic techniques such as CT scanograms. Other techniques such as ultrasound or dual-energy X-ray absorptiometry are briefly discussed. These may play an important additional part in the reduction of total radiation dose to the patients.

Adolescent↗
PubMed2000

Leg lengthening for short stature in Turner's syndrome.

We describe ten patients with Turner's syndrome (karyotype 45, XO) who had leg lengthening for short stature. A high incidence of postoperative complications was encountered and many patients required intramedullary fixation as a salvage procedure. We discuss the reasons for this and highlight the differences between our findings and those of a similar series recently reported. In view of the considerable difficulties encountered, we do not recommend leg lengthening in Turner's syndrome.

Adolescent↗
PubMed1995

The response of muscle to leg lengthening.

We used an experimental rabbit model of leg lengthening to study the morphology and function of muscle after different distraction rates. Lengthening was in twice-daily increments from 0.4 to 4 mm per day. New contractile tissue formed during lengthening, but some damage to the muscle fibres was seen even at rates of less than 1 mm per day; abnormalities increased with larger rates of lengthening. There was proliferation of fibrous tissue between the muscle fibres at distraction rates of over 1 mm per day. Active muscle function showed adaptation when the rate was 1.0 mm per day or less, but muscle compliance was normal only after rates of 0.4 mm per day. Muscle responded more favourably at rates of distraction slower than those shown to lead to the most prolific bone formation. At present the rate of distraction in clinical practice is determined mainly by factors which enhance osteogenesis. Our study suggests that it may be advisable to use a slower rate of elongation in patients with poor muscle compliance associated with the underlying pathology; this will allow better accommodation by the contractile and connective tissues of the muscles.

Animals↗
PubMed1992

Leg lengthening by the transiliac method.

The transiliac method of leg lengthening uses a modification of Salter's innominate osteotomy. The bone graft increases the length of the hemipelvis distal to the sacro-iliac joint. Leg-length inequality in 23 patients was treated by this method with an average gain in length of 2.8 cm (2.0 to 3.5). Apart from one residual femoral nerve palsy there were no notable complications. The facility to redirect the acetabulum allowed by the technique, may be useful in cases of potential hip instability or acetabular dysplasia.

Adolescent↗
PubMed1999

Design of an intramedullary leg lengthening device with a shape memory actuator.

The procedure and the external fixator for lengthening long bones was developed by G.A. Ilizarov in the late 1960's. This technique has, despite its proven abilities for leg lengthening and correction of angular deformities, some considerable disadvantages for the patients. Discomfort, infections and restricted weight bearing are some reasons for the development of a completely intramedullary device for leg lengthening. The device developed at the Laboratory of Biomechanical Engineering, University of Twente, is a telescopic intramedullary nail with a maximum diameter of 13 mm, which can be lengthened with 0.5 mm steps induced by a shape memory alloy actuator. The electrical energy for the actuator is supplied from outside the body by inductive coupling of two solenoid coils. Internally, the electrical energy is transformed to thermal energy by Thermofoils and Peltier-elements.

Bone Lengthening↗
PubMed1997

Leg lengthening by the Ilizarov technique for patients with sequelae of poliomyelitis.

Limb length discrepancy is common in patients with sequelae of poliomyelitis. However, treatment of this problem is difficult and complicated. From 1988 to 1993, 71 patients with sequelae of poliomyelitis were treated with leg lengthening by modifications of the Ilizarov technique. Their median age at surgery was 26.4 years (range, 11.6-38.1 yr). Patients were divided into four groups according to the method of treatment, with femoral lengthening in 18 patients, combined femoral and tibial lengthening in 6, tibial lengthening in 35, and tibial lengthening along and intramedullary locking nail in 12. At follow-up of 2 to 6.7 years, the combined femoral/tibial group had the greatest gain in length. Treatment time in the Ilizarov device was shortest in the tibial lengthening with locking nail group. The lengthening index, which was defined as days in the Ilizarov device required for each centimeter of lengthening (days/cm), was lowest in the tibial lengthening with locking nail group, followed by the combined femoral/tibial lengthening group. Complications such as soft tissue contracture, callus fracture and residual deformities were most common in the combined femoral/tibial lengthening group and the femoral lengthening group. Complications were least common in the tibial lengthening with locking nail group. The satisfaction rate was highest in the tibial lengthening with locking nail group. We found that in leg lengthening for patients with sequelae of poliomyelitis, callus maturation was slow, and patients tended to develop contractures despite physiotherapy, bracing or joint fixation. Concomitant and secondary surgery were frequently required to treat associated problems or residual deformities. Lengthening along an intramedullary locking nail can significantly shorten the treatment time with relatively few complications.

Adolescent↗
PubMed2005

Cosmetic bilateral leg lengthening: experience of 54 cases.

The Ilizarov method for leg lengthening was used for cosmetic reasons in 54 patients with constitutional short stature. A mean lengthening of 7 cm with a low rate of complications produced an excellent or good outcome in all the patients, including improvement in psychological disturbances related to short stature. Those who undergo the procedure must be highly motivated, fully informed and understand the technique and possible complications. We suggest that the Ilizarov method for cosmetic limb lengthening is a technique without major complications. However, it requires careful follow-up, and the involvement of orthopaedic surgeons who are familiar with use of the circular frame and are experienced in limb lengthening and correction of deformity for pathological conditions.

Adolescent↗
PubMedDate not supplied

Deformity correction of knee and leg lengthening by Ilizarov method in hypophosphatemic rickets: outcomes and significance of serum phosphate level.

The authors evaluated 14 patients with hypophosphatemic rickets who underwent correction of a knee deformity along with a leg lengthening by the Ilizarov method. Deformity correction alone was performed in 8 femora and 4 tibiae-fibulae, and concomitant deformity correction and limb lengthening (>1.0 cm) in 9 femora and 19 tibiae-fibulae. The healing index correlated with the biochemical parameters. Knee deformities were satisfactorily corrected in all patients except one. There was a statistically significant negative correlation between the healing index and the serum phosphate level: those who had a serum phosphate level higher than 2.5 mg/dL showed a relatively rapid regenerate bone healing compared with those with less than 2.5 mg/dL. The authors conclude that a serum phosphate level of 2.5 mg/dL as a cut-off point should be considered in deciding whether deformity correction alone or with a concomitant leg lengthening should be undertaken.

Adolescent↗