Hip Fractures Clinical Trial
Official title:
Hip Abductor Muscle Dysfunction After Nailing of Proximal Femoral Fractures, Incidence and Contributing Factors.
Proximal femoral fractures(PFFs) are common with advancing age. Proximal femoral nail (PFN) is now increasingly used to fix unstable fractures. Studies have demonstrated that muscle strength deficit is significantly large after PFFs. N. Ivanova et al found that hip muscle isometric strength for the fractured leg was significantly decreased 1 week and 6 months postoperatively. Besides, a recent study done by Nitin Wale et al concluded that abductor weakness and trendeleburg gait are fairly common in patients treated with PFN and this complaint is often overlooked. Despite significant improvement in muscle function after at least 6 months of physiotherapy as demonstrated by previous studies, we didn't come over a study explaining the main causes of remaining abductor lurch in patients with united fracture of the proximal femur treated using proximal femoral nail (short type).
In a group of patients treated at our hospital for fracture of the proximal femur using
different generations of the proximal femoral nail and after full fracture union, although
they had an excellent hip function we noticed that the majority of the patients still
suffering from limping and abductor lurch with a Trendelenburg gait.
Purpose: to detect hip abductor muscle dysfunction after treating proximal femoral fracture
using a proximal femoral nail (short type)
Research Questions: what is the reason(s) for remaining abductor lurch in patients with
proximal femoral fracture treated with PFN?
Study Design: an observational retrospective
Study Group number: 20 patients (to be modified according to the number of patients
registered at the study setting)
Assessment: (will be measured on both operated and non-operated sides)
- Clinical:
1. Harris hip score.
2. Leg length discrepancy: measured as the true length from the ASIS to the medial
malleolus.
3. The bulk of the abductor musculature: measured as the distance between the ASIS
anteriorly and the ischial tuberosity posteriorly.
4. Trendelenburg gait: assessed using modified McKay criteria2. These criteria measure
pain symptoms, gait pattern, Trendelenburg sign status, and the range of hip joint
movement
- Radiological:
1. Fracture union: assessed using Apley and Solomon's criteria6. Complete bone union
according to these criteria is defined as the time at which there is no pain upon
local palpation, no swelling in the limb, ability to walk without support and
pain-free, and evidence of a radiographic bridging callus or trabecula between
fragments.
2. Neck shaft angle: as the angle between the neck axis and the anatomical axis of the
proximal femur.
3. Leg length discrepancy: as the distance between a fixed reference point on the
lesser trochanter on both sides and the trans-ischial line.
4. Amount of nail prominent from the greater trochanter.
5. Hip horizontal offset: the length of a line drawn from the centre of the femoral
head and perpendicular to the anatomical axis of the femur.
- Neurophysiological:
EMG will be carried out to examine the (superior gluteal nerve) SGN for all patients. The
EMGs will be performed by the same neurophysiologist. The muscles will be evaluated according
to the criteria of the American Academy of Electrophysiological Medicine for needle EMG. In
order to exclude patients with polyneuropathy, radiculopathy, or plexopathy, nerve conduction
studies of both lower extremities will be performed. Then, gluteus medius muscles will be
assessed bilaterally to evaluate the SGN, the vastus medialis muscle for L4 root, tibialis
anterior muscle for L5 root, and gastrocnemius muscle for S1 root. First, resting activities
will be assessed for the signs of acute denervation (fibrillation and positive sharp waves),
followed by observation of the recruitment pattern examination of the motor unit action
potential (MUAP) amplitudes, and time characteristics. Finally, motor patterns of
interferences will be investigated during muscle contractions to obtain information about
denervation and reinnervation of examined muscles
Outcomes to be measured:
- Primary outcome: Neurophysiological status of Hip abductors function (EMG)
- Secondary outcome: HHS, altered radiological hip biomechanics
;
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