Hip displacement, common in patients with cerebral palsy (CP), causes pain and hinders adequate care. Hip reconstructive surgery (HRS) is performed to treat hip displacement; however, only a few studies have quantitatively assessed femoral head sphericity after HRS. The aim of this study was to quantitatively assess improvement in hip sphericity after HRS in patients with CP. We retrospectively analyzed hip radiographs of patients who had undergone HRS because of CP-associated hip displacement. The pre- and postoperative migration percentage (MP), femoral neck-shaft angle (NSA), and sphericity, as determined by the Mose hip ratio (MHR), age at surgery, Gross Motor Function Classification System level, surgical history including Dega pelvic osteotomy, and triradiate cartilage status were studied. Regression analyses using linear mixed model were performed to identify factors affecting hip sphericity improvement.Aims
Methods
Aims. The aims of this study were to review the surgical technique for a combined femoral head reduction osteotomy (FHRO) and periacetabular osteotomy (PAO), and to report the short-term clinical and radiological results of a combined FHRO/PAO for the treatment of selected severe
Introduction: Adequate bone in the femoral head and neck is a prerequisite in ensuring the longevity of a surface arthroplasty. The pistol grip deformity is one of the most common bony abnormalities of the femoral head encountered at the time of resurfacing. Severe flattening results in segmental bone loss requiring adjustments in the alignment of the femoral component to achieve optimal orientation. However, very little is known as to how the femoral implant positioning will be affected by increasing deformity. The purpose of this study was to classify the deformity of the femoral head to better understand how it influences the alignment of the femoral component during surface arthroplasty. This classification was then used to determine whether the femoral implant can be safely inserted with optimal alignment despite progressive deformity of the femoral head and neck. Methods: The classification was developed using plain radiographs and computer tomography scans from 61 patients (66 hips) who presented with primary osteoarthritis prior to hip resurfacing. Surface arthroplasty simulations were generated with three-dimensional computed tomography to quantify the change in femoral component orientation from the neutral position that would allow optimal alignment. The biomechanical parameters were also calculated to determine the influence of the deformity on the final implant position. Results: There were 47 men and 14 women, with a mean age of 50.3 years (range, 33 to 63 years). Three categories of
Background: Deformity of the femoral head after open reduction for developmental dislocation of the hip (DDH) influences the outcome of pelvic osteotomy as a final correction for residual dysplasia to prevent secondary osteoarthritis. The purpose of this study was to review long-term outcomes after open reduction using a medial approach for DDH. The correlation between age at the time of operation and
Patients with acetabular dysplasia commonly undergo
peri-acetabular osteotomy after skeletal maturity to reduce the risk
of the late development of osteoarthritis. Several studies have
suggested that deformity of the femoral head influences the long-term
outcome. We radiologically examined 224 hips in 112 patients with
acetabular dysplasia and early-stage osteoarthritis. There were
103 women and nine men with a mean age of 37.6 years (18 to 49).
A total of 201 hips were placed in the acetabular dysplasia group
and 23 in a normal group. The centre–edge angle and acetabular head
index were significantly smaller (both p <
0.001), and the acetabular
angle, acetabular roof angle and roundness index were significantly
greater in the acetabular dysplasia group than those in the normal
group (all p <
0.001). There were significant correlations between
the roundness index and other parameters. Femoral head shape may
be influenced by the severity of the acetabular dysplasia. Cite this article:
The August 2023 Children’s orthopaedics Roundup. 360. looks at: DDH: What can patients expect after open reduction?;
Aims. Perthes’ disease (PD) is a childhood hip disorder that can affect the quality of life in adulthood due to
Aims. Perthes’ disease (PD) often results in
The most important outcome predictor of Legg-Calvé-Perthes disease (LCPD) is the shape of the healed femoral head. However, the deformity of the femoral head is currently evaluated by non-reproducible, categorical, and qualitative classifications. In this regard, recent advances in computer vision might provide the opportunity to automatically detect and delineate the outlines of bone in radiographic images for calculating a continuous measure of
LCPD can cause
Femoroacetabular impingement (FAI) – enlarged, aspherical
Introduction. Legg-Calvé-Perthes disease (LCPD) often results in
Perthes disease is a childhood disorder often resulting in
Method. The anteroposterior pelvic radiographs of 84 children (87 hips with developmental dysplasia) seen between 1995 and 2004 were reviewed retrospectively. Each radiograph was photographed digitally and converted to the negative using Microsoft Photo Editor. Arthrograms were also assessed at the time of femoral head reduction. The acetabular index (AI) and
Ganz’s studies made it possible to address joint deformities on both the femoral and acetabular side brought about by Perthes’ disease. Femoral head reduction osteotomy (FHRO) was developed to improve joint congruency, along with periacetabular osteotomy (PAO), which may enhance coverage and containment. The purpose of this study is to show the clinical and morphological outcomes of the technique and the use of an implemented planning approach. From September 2015 to December 2021, 13 FHROs were performed on 11 patients for Perthes’ disease in two centres. Of these, 11 hips had an associated PAO. A specific CT- and MRI-based protocol for virtual simulation of the corrections was developed. Outcomes were assessed with radiological parameters (sphericity index, extrusion index, integrity of the Shenton’s line, lateral centre-edge angle (LCEA), Tönnis angle), and clinical parameters (range of motion, visual analogue scale (VAS) for pain, Merle d'Aubigné-Postel score, modified Harris Hip Score (mHHS), and EuroQol five-dimension five-level health questionnaire (EQ-5D-5L)). Early and late complications were reported.Aims
Methods
The hip-shelf procedure is less often indicated since the introduction of peri-acetabular osteotomy (PAO). Although this procedure does not modify pelvic shape, its influence on subsequent total hip arthroplasty (THA) is not known. We performed a case-control study comparing THA after hip-shelf surgery and THA in dysplastic hips to determine: 1) its influence on THA survival, 2) technical issues and complications related to the former procedure. We performed a retrospective case-control study comparing 61 THA cases done after hip-shelf versus 63 THA in case-matched dysplastic hips (control group). The control group was matched according to sex, age, BMI, ASA and Charnley score, and bearing type. We compared survival and function (Harris, Oxford-12), complications at surgery, rate of bone graft at cup insertion, and post-operative complications. The 13-year survival rates for any reason did not differ: 89% ± 3.2% in THA after hip shelf versus 83% ± 4.5% in the controls (p = 0.56). Functional scores were better in the control group (Harris 90 ± 10, Oxford 41/48) than in the hip-shelf group (Harris 84.7 ± 14.7, Oxford 39/48) (p = 0.01 and p = 0.04). Operative time, bleeding and rate of acetabular bone grafting (1.6 hip-shelf versus 9.5 control) were not different (p > 0.05). Postoperative complication rates did not differ: one transient fibular nerve palsy and two dislocations (3.2%) in the hip-shelf group versus four dislocations in the control group (6.3%). The hip-shelf procedure does not compromise the results of a subsequent THA in dysplastic hips. This procedure is simple and may keep its indications versus PAO in severely subluxed hips or in case of severe
Severe
Introduction and Aims: In a radiological study we evaluated the outcome of the Chiari osteotomy as a primary method of femoral head containment in patients with Perthes’ disease presenting at the age of eight years or older. Even when Salter’s prerequisites are met, the results of a Salter osteotomy is known to be poor in this group. Method: Thirteen patients underwent a Chiari osteotomy at a mean age of nine years and four months. The osteotomy was performed before
In a radiological study, we evaluated the outcome of the Chiari osteotomy as a primary method of femoral head containment in a distinct group of patients with Perthes’ disease. Even when Salter’s prerequisites are met, the results of a Salter osteotomy are known to be poor in this particular group of patients. At the time of operation, the mean age of the 13 patients who underwent Chiari osteotomy was 9 years 4 months. The osteotomy was performed early in the disease process, before
The aim of this study was to determine the clinical outcomes and factors contributing to failure of transposition osteotomy of the acetabulum (TOA), a type of spherical periacetabular osteotomy, for advanced osteoarthritis secondary to hip dysplasia. We reviewed patients with Tönnis grade 2 osteoarthritis secondary to hip dysplasia who underwent TOA between November 1998 and December 2019. Patient demographic details, osteotomy-related complications, and the modified Harris Hip Score (mHHS) were obtained via medical notes review. Radiological indicators of hip dysplasia were assessed using preoperative and postoperative radiographs. The cumulative probability of TOA failure (progression to Tönnis grade 3 or conversion to total hip arthroplasty) was estimated using the Kaplan-Meier product-limited method. A multivariate Cox proportional hazards model was used to identify predictors of failure.Aims
Methods
Pelvic incidence (PI) is considered an important anatomical parameter for determining the sagittal balance of the spine. The contribution of an abnormal PI to hip osteoarthritis (OA) remains controversial. In this study, we aimed to investigate the relationship between PI and hip OA, and the difference in PI between hip OA without anatomical abnormalities (primary OA) and hip OA with developmental dysplasia of the hip (DDH-OA). In this study, 100 patients each of primary OA, DDH-OA, and control subjects with no history of hip disease were included. CT images were used to measure PI, sagittal femoral head coverage, α angle, and acetabular anteversion. PI was also subdivided into three categories: high PI (larger than 64.0°), medium PI (42.0° to 64.0°), and low PI (less than 42.0°). The anterior centre edge angles, posterior centre edge angles, and total sagittal femoral head coverage were measured. The correlations between PI and sagittal femoral head coverage, α angle, and acetabular anteversion were examined.Aims
Methods
Haemophilia is a rare cause of avascular necrosis of the femoral head. We report three cases from one centre, an incidence of 2.8%. All three cases presented "silently", and this makes the early diagnosis difficult. Awareness of the condition should lead to examination of the hips of haemophiliac patients at every outpatient visit and admission in the hope that hip disease can be diagnosed at an early stage. This may allow earlier treatment, less
Hip arthrography was performed in 19 patients in the initial stage of Perthes' disease. Sphericity and subluxation were measured and it was found that subluxation was independent of the
Aim: To assess the outcome for Perthes disease in children over eight treated by observation, varus osteotomy, abduction plasters and acetabular augmentation. Methods and results: A retrospective case note review of prospectively collected data for 44 children (48) hips with Catterall grades 2, 3 or 4 Perthes’ disease with onset age eight or older and followed to maturity was performed. The groups were demographically similar. For all groups combined 60% had a satisfactory Stulberg grade I to III outcome. Poorer outcomes (as assessed by Stulberg, centre edge angle and Reimer’s migration index) were associated with increasing age, greater initial head deformity and greater head involvement. Initial head deformity did not remodel for any treatment group. Indeed, progressive head deformity occurred despite plaster treatment or varus osteotomy but not after acetabular augmentation. Hips managed by acetabular augmentation also had better outcomes than the other groups for Stulberg, Reimer’s index and centre-edge angle. Conclusions: Whatever the treatment the outcome for Perthes’ disease in children over eight is poorer with increasing age. No treatment offers the prospect of a good result in the older child with significant head involvement or significant initial deformity but acetabular augmentation seems to improve Stulberg, Reimer’s migration and centre-edge angle outcomes and prevents progressive
The changes of stress distribution in the femoral head with Perthes disease were observed under several condition. Finite element models were constructed referring to X-ray images and magnetic resonance images of the intact hip joint. The model was divided into five parts: cancellous bone, articular cartilage, necrotic bone, cortical bone, physeal cartilage. Material properties were alloted to these components by the past literature. The body weight and abductor muscle force were applied as loading. The model was altered to study the effect of age, the extent of necrosis, and lateralization of the fomoral head. Analysis were performed on a digital computer PC-9821(NEC) using the finite element program. There was no significant difference in stress distribution patterns regardless of age or extent of necrosis. However, compressive stresses were concentrated on the lateral portion of the epiphysis by lateralization of femoral head. The
Open reduction for developmental dislocation of the hip (DDH) is invasive and sometimes results in
Cam-type femoroacetabular impingement (cam-FAI) can be treated with femoral neck osteochondroplasty to increase the clearance between the femoral head/neck and the acetabular rim. Because femur-acetabulum contact is very difficult to assess directly in patients, it is not clear if this surgery achieves its objective of reducing femur-acetabulum contact, and it is not clear how much of the femoral head/neck region should be resected to allow clearance in all activities. Our research question was: “Does femoral neck osteochondroplasty increase femur-acetabulum clearance in an extreme hip posture in patients with cam FAI?”. We recruited 8 consecutive patients scheduled to undergo arthroscopic femoral neck osteochondroplasty to treat cam-type FAI. We assessed clearance between the acetabulum and the femoral neck before surgery and at 6 months post-op using an upright open MRI scanner that allowed the hip to be scanned in flexed postures. We scanned each subject in a supine hip flexion (90 degree), adduction and internal rotation (FADIR) posture. We measured the beta angle, which describes clearance between the acetabular rim and the
We reviewed the serial radiographs of 54 hips in 47 children treated by closed reduction for congenital dislocation of the hip and followed to at least 14 years of age, to determine the causes of acetabular dysplasia. We excluded hips with
Though the pathogenesis of Legg-Calve-Perthes disease (LCPD) is unknown, repetitive microtrauma resulting in deformity has been postulated. The purpose of this study is to trial a novel upright MRI scanner, to determine whether any deformation occurs in femoral heads affected by LCPD with weightbearing. Children affected by LCPD were recruited for analysis. Children received both standing weightbearing and supine scans in the MROpen upright MRI scanner, for coronal T1 GFE sequences, both hips in field of view. Parameters of femoral head height, width, and lateral extrusion of affected and unaffected hips were assessed by two independent raters, repeated at a one month interval. Inter- and intraclass correlation coefficients were determined. Standing and supine measurements were compared for each femoral head.Aims
Methods
We have tested the reliability of a recently reported classification system of hip morphology in adolescents with cerebral palsy in whom the triradiate cartilage was closed. The classification is a six-grade ordinal scale, based on the measurement of the migration percentage and an assessment of Shenton’s arch, deformity of the
Complex total hip arthroplasty (THA) with subtrochanteric shortening osteotomy is necessary in conditions other than developmental dysplasia of the hip (DDH) and septic arthritis sequelae with significant proximal femur migration. Our aim was to evaluate the hip centre restoration with THAs in these hips. In all, 27 THAs in 25 patients requiring THA with femoral shortening between 2012 and 2019 were assessed. Bilateral shortening was required in two patients. Subtrochanteric shortening was required in 14 out of 27 hips (51.9%) with aetiology other than DDH or septic arthritis. Vertical centre of rotation (VCOR), horizontal centre of rotation, offset, and functional outcome was calculated. The mean followup was 24.4 months (5 to 92 months).Aims
Methods
DDH with or without previous treatment is the most frequent source of early hip OA in adolescents. Others are hip joint deformation following Legg-Calve-Perthes disease, slipped capital epiphysis or trauma. Secondary OA after rheumatoid arthritis, bacterial infection or as result of an hemophilic hip joint are relatively infrequent. The choice of treatment depends on the type of the deformity and the severity of osteoarthritic changes. Osteotomies are favorably performed in adolescents. Arthrodesis is rarely accepted in this age group. In selected individuals THR is the matter of choice. Pain, limping gait, restricted joint motion and sometimes clicking phemomena are the usual complains. Pain is usually aggravated by running and other sports activities. Residual dysplasia of the hip with a spherical femoral head is best treated by a triple periacetabular osteotomy. The Bernese ostetomy of Ganz (. 3. ) and the triple osteotomy of Tönnis (. 9. ) are popular procedures. They mobilise an acetabular fragment, then reorient and stabilise the fragment in an optimal position. Internal fixation with screws provides stability and allows early mobilisation with partial weight bearing. Chiari’s osteotomy is a supracetabular rotatory displacement osteotomy. Femoral head and joint capsule are medialised and covered by the osteomised iliac bone. The joint capsule in the weight bearing zone is transformed into fibrous cartilage by time. Congruent remodelling of the acetabular roof and fibrous tissue transformation into cartilage are biased by inproper height and orientation of the osteotomy (. 5. ). There is still an indication in severe DDH with subluxation of the femoral head and those with a severely deformed femoral head. In pathomorphologies with aspherical femoral heads femoral osteotomies, usually valgus osteotomies, are required additionally in order to optimize the joint congruency. A dysplastic hip in a high dislocation and moderate to severe OA are contraindications. Radiographic work up includes pelvic ap view and faux profil view. Assessment of the anterior and posterior acetabular rim indicate orientation of the acetabulum in terms of anteversion / retroversion. Orientation of the subchondral sclerosis over the femoral head is an indicator of femoral head coverage as CE-angle and AC-angle. 20°–30° abduction view in neutral rotation mimikes the postoperative acetabulum / femoral head relation. From CT-scans acetabular orientation ( ante-version / retroversion ), degenerative bone cysts, posteroinferior joint space and
A borderline dysplastic hip can behave as either stable or unstable and this makes surgical decision making challenging. While an unstable hip may be best treated by acetabular reorientation, stable hips can be treated arthroscopically. Several imaging parameters can help to identify the appropriate treatment, including the Femoro-Epiphyseal Acetabular Roof (FEAR) index, measured on plain radiographs. The aim of this study was to assess the reliability and the sensitivity of FEAR index on MRI compared with its radiological measurement. The technique of measuring the FEAR index on MRI was defined and its reliability validated. A retrospective study assessed three groups of 20 patients: an unstable group of ‘borderline dysplastic hips’ with lateral centre edge angle (LCEA) less than 25° treated successfully by periacetabular osteotomy; a stable group of ‘borderline dysplastic hips’ with LCEA less than 25° treated successfully by impingement surgery; and an asymptomatic control group with LCEA between 25° and 35°. The following measurements were performed on both standardized radiographs and on MRI: LCEA, acetabular index, femoral anteversion, and FEAR index.Aims
Patients and Methods
Hip Resurfacing is now an established treatment option for young active patients with osteoarthritis. However, there is slow uptake of hip resurfacing by some surgeons, with concern regarding failure from femoral neck fracture, a small but significant risk. Femoral neck fracture may follow notching of the neck, which occurs upon preparing the femoral head after inserting the femoral head/neck guide-wire. The placement of the femoral head/neck guide-wire is a concern for even experienced surgeons routinely, and in difficult cases of
The treatment of hip dysplasia should be customised
for patients individually based on radiographic findings, patient
age, and the patient’s overall articular cartilage status. In many
patients, restoration of hip anatomy as close to normal as possible
with a PAO is the treatment of choice. Cite this article:
The December 2013 Children’s orthopaedics Roundup360 looks at: Long term-changes in hip morphology following osteotomy; Arthrogrypotic wrist contractures are surgically amenable; Paediatric femoral lengthening over a nail; Current management of paediatric supracondylar fractures; MRI perfusion index predictive of Perthes’ progression; Abduction bracing effective in residual acetabular deformity; Hurler syndrome in the spotlight; and the Pavlik works for femoral fractures too!
In order to clarify how intra-articular lesions
influence the survival of a periacetabular osteotomy in patients
with dysplasia of the hip, we performed an observational study of
121 patients (121 hips) who underwent a transposition osteotomy
of the acetabulum combined with an arthroscopy. Their mean age was
40.2 years (13 to 64) and the mean follow-up was 9.9 years (2 to
18). Labral and cartilage degeneration tended to originate from
the anterosuperior part of the acetabulum, followed by the femoral
side. In all, eight hips (6.6%) had post-operative progression to
Kellgren–Lawrence grade 4 changes, and these hips were associated
with the following factors: moderate osteoarthritis, decreased width
of the joint space, joint incongruity, and advanced intra-articular
lesions (subchondral bone exposure in the cartilage and a full-thickness
labral tear). Multivariate analysis indicated subchondral bone exposure
on the femoral head as an independent risk factor for progression
of osteoarthritis (p = 0.003). In hips with early stage osteoarthritis,
femoral subchondral bone exposure was a risk factor for progression of
the grade of osteoarthritis. Although the outcome of transposition osteotomy of the acetabulum
was satisfactory, post-operative progression of osteoarthritis occurred
at a high rate in hips with advanced intra-articular lesions, particularly
in those where the degenerative process had reached the point of
femoral subchondral bone exposure.
A total of 47 non-walking patients (52 hips) with severe cerebral palsy and with a mean age of 14 years, (9 to 27) underwent a Dega-type pelvic osteotomy after closure of the triradiate cartilage, together with a derotation varus-shortening femoral osteotomy and soft-tissue correction for hip displacement which caused pain and/or difficulties in sitting. The mean follow-up was 48 months (12 to 153). The migration percentage improved from a pre-operative mean of 70% (26% to 100%) to 10% (0% to 100%) post-operatively. In five hips the post-operative migration percentage was greater than 25%, which was associated with continuing pain in two patients. Three patients had persistent hip pain and a migration percentage less than 25%. In five hips a fracture through the acetabulum occurred, and in another there was avascular necrosis of the superior acetabular segment, but these had no adverse effect on functional outcome. We conclude that it is possible to perform a satisfactory pelvic osteotomy of this type in these patients after the triradiate cartilage has been closed.
Intertrochanteric osteotomy may postpone the need for total hip replacement (THR). In young patients with an acquired deformity of the femoral head and secondary osteoarthritis, a valgus intertrochanteric osteotomy may allow better congruency but the acetabular cover may become insufficient because of subluxation of the femoral head. In patients with a spherical femoral head and acetabular dysplasia, cover can still remain insufficient after varus displacement osteotomy. We present the long-term results of intertrochanteric osteotomy combined with an acetabular shelfplasty in both these circumstances. Sixteen hips (15 patients) with a deformed femoral head, and ten (seven patients) with a spherical femoral head, underwent an intertrochanteric osteotomy and acetabular shelfplasty. The mean age at the time of surgery was 30 and 37 years and the mean final follow-up was 15 and 19 years, respectively. Six patients in the deformed group, but only one in the spherical group, had required a THR by the time of their final follow-up. In both groups, those who had not undergone a THR had a good result. Acetabular shelfplasty is an excellent addition to an intertrochanteric osteotomy and gives full cover of the femoral head in patients with a deformity of the head and secondary osteoarthritis.
Femoroacetabular impingement (FAI) causes pain
and chondrolabral damage via mechanical overload during movement
of the hip. It is caused by many different types of pathoanatomy,
including the cam ‘bump’, decreased head–neck offset, acetabular
retroversion, global acetabular overcoverage, prominent anterior–inferior
iliac spine, slipped capital femoral epiphysis, and the sequelae
of childhood Perthes’ disease. Both evolutionary and developmental factors may cause FAI. Prevalence
studies show that anatomic variations that cause FAI are common
in the asymptomatic population. Young athletes may be predisposed
to FAI because of the stress on the physis during development. Other
factors, including the soft tissues, may also influence symptoms and
chondrolabral damage. FAI and the resultant chondrolabral pathology are often treated
arthroscopically. Although the results are favourable, morphologies
can be complex, patient expectations are high and the surgery is
challenging. The long-term outcomes of hip arthroscopy are still
forthcoming and it is unknown if treatment of FAI will prevent arthrosis.