Clinical trial NCT03443648: External Fixator Assisted Genu Varum Correction
Official title: Fixator Assisted Plating for Correction of High Degree Genu Varum Deformity
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Deformity
Lead sponsor: Assiut University
Sponsor class: OTHER
First posted: 2018-02-23
Enrollment: 10
Sex: ALL
Minimum age (years): 18
Maximum age (years): 40
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: Assessment of accuracy of correction of genu varum more than 20 degrees using external fixator assisted plating. Intraoperatively, the operative time needed for completion of accurate correction, torniquet use, blood loss will be assessed. Postoperative complications either early ones like infection, thromboembolic complications, peroneal nerve palsy or late post operative complications like implant failure, delayed union, non union and bone healing time will be assessed..

Detailed description: Malalignment prevents proper transmission of forces across the knee leading to advance or even start the progression of osteoarthritis.Preoperative planning is necessary to identify the level and magnitude of the deformity. Corrections can be performed acutely or gradually. Acute correction can be achieved by opening wedge, closing wedge or dome osteotomies followed by internal fixation. On the other hand, gradual correction can be achieved by osteotomy with external fixation.

Although osteotomy with internal fixation is more convenient to the patient than external fixator, it has many drawbacks. These include the need for large surgical exposure, soft tissue stripping and difficulty executing precise deformity correction. Meticulous preoperative planning is important when internal fixation is planed. It also needs to be executed precisely till fixation is completed. Under-correction or over-correction is possible while executing the procedure. Furthermore, iatrogenic deformity in other planes may also develop. If such a deformity is significant, it may adversely affect the function or may lead to excessive loading on adjacent joints. In some cases, revision of surgery for further correction may be required to correct this residual or iatrogenic deformity.

External fixation can be used for gradual correction of genu varum. In spite of the disadvantages of external fixation like being uncomfortable for the patient, tethering soft tissue, associated pin site infection and irritation , it is re-adjustable postoperatively. This allows controlled accurate correction of the mechanical axis of the lower limb.

Our study is implicated on correction of high degree genu varum which is more than 20 degrees .To correct such deformity, it is difficult to calculate the amount of wedge opening intraoperative. The described trigonometric calculation of the size of the base is described for deformity less than 20 degrees .In this study we are going to use a hybrid technique of both external and internal fixation, so we can make use of the benefits of both internal and external fixation techniques External fixation by limb reconstruction system (LRS) or Taylor Spatial frame(TSF) is used to control and stabilize fragments while performing the desired correction. A locked T plate is then applied to stabilize the fully corrected osteotomy. This allows intraoperative removal of the external fixator without loss of correction. Then we compare the planned correction with the achieved correction.

Eligibility criteria: Inclusion Criteria:

1. Age 18years old or more
2. Varus 20 degrees or more

Exclusion Criteria:

1. Contraindication to internal fixation
2. Associated osteoarthritis

Primary outcomes:
measure: assesment of accuracy of correction of high degree genu varum using this method of correction.
timeFrame: one year
Secondary outcomes:
Other outcomes:
Locations:
Study officials:
References:
citation: Hochberg MC, Altman RD, Brandt KD, Clark BM, Dieppe PA, Griffin MR, Moskowitz RW, Schnitzer TJ. Guidelines for the medical management of osteoarthritis. Part II. Osteoarthritis of the knee. American College of Rheumatology. Arthritis Rheum. 1995 Nov;38(11):1541-6. doi: 10.1002/art.1780381104.
citation: Sharma L, Song J, Felson DT, Cahue S, Shamiyeh E, Dunlop DD. The role of knee alignment in disease progression and functional decline in knee osteoarthritis. JAMA. 2001 Jul 11;286(2):188-95. doi: 10.1001/jama.286.2.188.
citation: Hernigou P, Medevielle D, Debeyre J, Goutallier D. Proximal tibial osteotomy for osteoarthritis with varus deformity. A ten to thirteen-year follow-up study. J Bone Joint Surg Am. 1987 Mar;69(3):332-54.
citation: Tuli SM, Kapoor V. High tibial closing wedge osteotomy for medial compartment osteoarthrosis of knee. Indian J Orthop. 2008 Jan;42(1):73-7. doi: 10.4103/0019-5413.38585.
citation: Sundaram NA, Hallett JP, Sullivan MF. Dome osteotomy of the tibia for osteoarthritis of the knee. J Bone Joint Surg Br. 1986 Nov;68(5):782-6. doi: 10.1302/0301-620X.68B5.3782246.
citation: Rozbruch SR, Segal K, Ilizarov S, Fragomen AT, Ilizarov G. Does the Taylor Spatial Frame accurately correct tibial deformities? Clin Orthop Relat Res. 2010 May;468(5):1352-61. doi: 10.1007/s11999-009-1161-7. Epub 2009 Nov 13.
citation: Kazemi SM, Qoreishi M, Behboudi E, Manafi A, Kazemi SK. Evaluation of Changes in the Tibiotalar joint after High Tibial Osteotomy. Arch Bone Jt Surg. 2017 May;5(3):149-152.
citation: Gugenheim JJ Jr, Brinker MR. Bone realignment with use of temporary external fixation for distal femoral valgus and varus deformities. J Bone Joint Surg Am. 2003 Jul;85(7):1229-37. doi: 10.2106/00004623-200307000-00008.
citation: Bar-On E, Becker T, Katz K, Velkes S, Salai M, Weigl DM. Corrective lower limb osteotomies in children using temporary external fixation and percutaneous locking plates. J Child Orthop. 2009 Apr;3(2):137-43. doi: 10.1007/s11832-009-0165-x. Epub 2009 Mar 12.
citation: Rozbruch SR. Fixator-assisted plating of limb deformities. Oper Tech Orthop. 2011;21:174-.
citation: Insall JN, Dorr LD, Scott RD, Scott WN. Rationale of the Knee Society clinical rating system. Clin Orthop Relat Res. 1989 Nov;(248):13-4.
citation: Tegner Y, Lysholm J. Rating systems in the evaluation of knee ligament injuries. Clin Orthop Relat Res. 1985 Sep;(198):43-9.
citation: Paley D, Herzenberg JE, Tetsworth K, McKie J, Bhave A. Deformity planning for frontal and sagittal plane corrective osteotomies. Orthop Clin North Am. 1994 Jul;25(3):425-65.
citation: Paley D. 1st ed. New York: Springer; 2002. Principles of deformity correction; p 1-18.12.
citation: Paley D. 1st ed. New York: Springer; 2002. Principles of deformity correction; pp. 175-94