Pelvementry AP Transverse / Lat at Dr. Essa Lab

Pelvementry AP Transverse / Lat at Dr. Essa Lab

The Pelvementry AP Transverse / Lat is a highly specialized diagnostic imaging examination designed to measure the dimensions and capacity of the maternal pelvis. Historically referred to as pelvimetry, this radiographic study utilizes advanced digital X-ray technology to obtain precise anatomical measurements of the pelvic pelvic inlet, mid-pelvis, and pelvic outlet. By acquiring both Anteroposterior (AP) Transverse and Lateral (Lat) views, consultant radiologists at Dr. Essa Lab can comprehensively evaluate the pelvic architecture. This examination plays a critical role in clinical obstetrics and orthopedics, particularly when assessing whether the pelvic canal is of adequate size and shape to allow the safe passage of a fetus during vaginal delivery, or when evaluating structural changes following pelvic trauma.

At Dr. Essa Lab, the Pelvementry AP Transverse / Lat is performed using state-of-the-art digital radiography (DR) systems. These modern systems are engineered to deliver exceptionally high-resolution images while minimizing radiation exposure, adhering strictly to the ALARA (As Low As Reasonably Achievable) safety principle. The anatomical structures evaluated during this procedure include the bony pelvis, which comprises the ilium, ischium, pubis, sacrum, and coccyx. Specifically, the radiologist measures key obstetric parameters such as the transverse diameter of the pelvic inlet, the interspinous (mid-pelvic) diameter, the intertuberous (outlet) diameter, and the obstetric conjugate. Understanding these dimensions is of paramount clinical importance, as pelvic contraction or abnormal pelvic morphology can lead to serious complications, including obstructed labor and cephalopelvic disproportion (CPD).

The diagnostic value of the Pelvementry AP Transverse / Lat lies in its ability to provide objective, quantifiable data that clinical examinations alone cannot deliver. While clinical pelvimetry provides a subjective assessment of the pelvic outlet and lower pelvis, it cannot accurately measure the high pelvic inlet or the mid-pelvis. Radiographic pelvimetry bridges this diagnostic gap, offering obstetricians and orthopedic specialists a clear, detailed map of the patient\’s pelvic anatomy. The benefits of undergoing this examination at Dr. Essa Lab include access to highly experienced radiologists, rapid digital processing, and precise measurements that aid in making critical decisions regarding delivery planning, such as determining the safety of a trial of labor after a previous cesarean section (TOLAC) or identifying the need for an elective cesarean delivery.

Clinical Procedure: What to Expect

Patient Preparation

Proper preparation is essential to ensure the highest quality radiographic images and to maintain patient safety during the Pelvementry AP Transverse / Lat examination. Patients are advised to follow these guidelines:

• Pregnancy Notification: It is absolutely critical that patients inform the radiographer or radiologist if they are pregnant, suspect they might be pregnant, or are actively trying to conceive. Because this test utilizes ionizing radiation, alternative imaging modalities like MRI or ultrasound may be considered, or special low-dose fetal shielding protocols will be implemented if the test is deemed clinically necessary.
• Clothing and Attire: Patients should wear comfortable, loose-fitting clothing. You may be asked to change into a sterile patient gown provided by Dr. Essa Lab to prevent interference from zippers, buttons, snaps, or thick fabrics.
• Removal of Metallic Objects: All metallic items, including jewelry, belts, body piercings, underwire bras, and clothing with metal embellishments, must be removed from the pelvic and abdominal regions, as metal causes significant artifacts on X-ray images.
• Dietary Restrictions: There are no fasting or dietary restrictions required for a plain pelvic X-ray. Patients may eat, drink, and take their regular medications as prescribed.
• Bladder Voiding: Patients are often requested to empty their bladder immediately before the procedure to improve comfort and reduce pelvic soft-tissue density on the radiograph.

During the Procedure

The Pelvementry AP Transverse / Lat procedure is non-invasive, painless, and typically completed within 15 to 20 minutes. Upon entering the digital radiography suite at Dr. Essa Lab, the patient is greeted by a certified radiologic technologist who will explain the steps of the procedure.

For the first component, the Anteroposterior (AP) Transverse view, the patient is positioned supine (lying flat on their back) on the digital X-ray table. The technologist carefully aligns the pelvic region with the X-ray detector. A specialized radiopaque measuring ruler, often referred to as a Colcher-Sussman pelvimeter, may be placed at the level of the ischial tuberosities or the pubic symphysis. This ruler appears on the final X-ray image, allowing the radiologist to calculate exact, life-sized anatomical measurements regardless of radiographic magnification. The patient must remain completely still for a few seconds while the exposure is taken to prevent motion blur.

For the second component, the Lateral (Lat) view, the patient is instructed to turn onto their side (usually the left lateral recumbent position) with their hips and knees slightly flexed to stabilize the body. Alternatively, this view may be taken in a standing position depending on the specific clinical protocol. The technologist ensures that the pelvis is perfectly lateral without rotation. The X-ray beam is directed horizontally through the greater trochanters. Lead shielding is meticulously placed over non-target areas to minimize unnecessary radiation exposure. The patient is again asked to hold their breath and remain perfectly still during the brief exposure. Once both views are verified for technical quality, the patient is free to change back into their clothes and resume normal daily activities immediately.

When is a Pelvementry AP Transverse / Lat Performed?

Suspected Cephalopelvic Disproportion (CPD)

Cephalopelvic disproportion (CPD) is a clinical condition where a mismatch exists between the size or shape of the maternal pelvis and the size of the fetal head, making vaginal delivery physically impossible or highly dangerous. Physicians request a Pelvementry AP Transverse / Lat when clinical signs, such as a high fetal station late in pregnancy or an unusually large fetal head estimation on ultrasound, suggest potential CPD. The radiographic measurements help confirm whether the pelvic diameters are contracted, allowing the obstetric team to plan a safe delivery route and avoid the risks of prolonged, obstructed labor.

Assessment After Pelvic Trauma or Fracture

High-energy trauma, such as motor vehicle accidents, severe falls, or industrial injuries, can result in pelvic fractures that disrupt the structural integrity of the pelvic ring. Even after surgical fixation or natural healing, the internal dimensions of the pelvis may be permanently altered. Orthopedic surgeons and obstetricians request this examination to evaluate the post-traumatic pelvic anatomy. The precise measurements obtained from the AP and Lateral views assist in determining if the pelvic canal has narrowed or become asymmetrical, which is crucial for planning future pregnancies or assessing orthopedic recovery.

Evaluation of Congenital Pelvic Deformities

Congenital skeletal anomalies, developmental dysplasia of the hip (DDH), or childhood metabolic bone diseases like rickets can lead to abnormal development of the pelvic girdle. These conditions often result in atypical pelvic shapes, such as an extremely narrow android pelvis or an asymmetrical Naegele\’s pelvis. Physicians utilize the Pelvementry AP Transverse / Lat to visualize these structural variations and measure the true pelvic diameters. This objective data is vital for diagnosing congenital pelvic contraction and understanding its impact on the patient\’s biomechanics and reproductive health.

Planning for Vaginal Birth After Cesarean (VBAC)

For patients who have previously delivered via cesarean section and are considering a Trial of Labor After Cesarean (TOLAC) to achieve a Vaginal Birth After Cesarean (VBAC), accurate pelvic assessment is highly beneficial. Obstetricians may request radiographic pelvimetry to ensure that the patient\’s pelvic dimensions are adequate to support a vaginal delivery. Identifying a contracted pelvis beforehand significantly reduces the risk of emergency intrapartum cesarean sections, uterine rupture, and fetal distress, thereby enhancing maternal and neonatal safety.

Inability to Progress in Active Labor

In certain clinical settings, particularly when labor has stalled or failed to progress despite adequate uterine contractions and optimal fetal positioning, an objective assessment of the pelvic canal may be required. While this is less common during active labor due to time constraints, the Pelvementry AP Transverse / Lat can be performed rapidly in late pregnancy or early labor to investigate suspected mechanical obstruction. The findings assist the clinical team in deciding whether to continue labor induction or proceed with a cesarean delivery to prevent maternal exhaustion and fetal hypoxia.

What Does a Pelvementry AP Transverse / Lat Detect?

• Gynecoid Pelvis: Detection of the classic female pelvic shape, characterized by a round inlet, wide subpubic arch, and blunt ischial spines, which is highly favorable for vaginal delivery.
• Android Pelvis: Identification of a heart-shaped pelvic inlet with convergent side walls and a narrow subpubic arch, typical of male anatomy, which increases the risk of labor dystocia.
• Anthropoid Pelvis: Detection of an oval pelvic inlet with an elongated anteroposterior diameter and a shortened transverse diameter, which may favor a persistent occiput posterior fetal position.
• Platypelloid Pelvis: Identification of a flattened pelvic shape with a wide transverse diameter but a severely shortened anteroposterior diameter, often leading to transverse arrest of the fetal head.
• Pelvic Inlet Contraction: Detection of a transverse inlet diameter of less than 11.0 cm or an obstetric conjugate of less than 10.0 cm, indicating a high risk of engagement failure.
• Mid-Pelvic Contraction: Measurement of an interspinous diameter of less than 9.5 cm, which can arrest the descent of the fetal head during the second stage of labor.
• Pelvic Outlet Contraction: Detection of an intertuberous (bituberous) diameter of less than 8.0 cm, which can obstruct the final exit of the fetus.
• Prominent Ischial Spines: Identification of sharp, inward-projecting ischial spines that narrow the mid-pelvic plane.
• Sacral Flatness: Detection of a straight or flat sacrum, which reduces the posterior space available in the pelvic cavity.
• Sacral Kyphosis: Identification of an exaggerated forward curvature of the sacrum, potentially obstructing the pelvic canal.
• Ankylosed Coccyx: Detection of a rigid, non-mobile coccyx that fails to push backward during delivery, narrowing the pelvic outlet.
• Pubic Symphysis Diastasis: Identification of abnormal widening or separation of the pubic symphysis joint, often associated with peripartum pelvic pain or trauma.
• Pelvic Ring Fractures: Detection of acute, healing, or malunited fractures of the pubic rami, iliac wings, or sacrum.
• Sacroiliac Joint Sclerosis: Identification of degenerative changes, narrowing, or subchondral sclerosis within the sacroiliac joints.
• Spondylolisthesis: Detection of the forward slippage of the L5 vertebra over the S1 sacral segment, which can alter pelvic inclination.
• Osteophytes: Identification of bone spurs along the pelvic brim or acetabular margins that may impinge on pelvic soft tissues.
• Asymmetrical Pelvic Inlet: Detection of unilateral pelvic narrowing, often secondary to childhood hip pathology or asymmetric trauma.
• Osteopenia or Osteoporosis: Qualitative assessment of reduced bone mineral density within the pelvic girdle.
• Pelvic Bone Tumors: Detection of benign or malignant osteolytic or osteoblastic lesions within the pelvic bones.
• Subpubic Angle Narrowing: Measurement of a subpubic arch angle of less than 80 degrees, indicating reduced outlet capacity.
• True Conjugate Reduction: Measurement of a shortened distance between the upper margin of the pubic symphysis and the sacral promontory.
• Obstetric Conjugate Reduction: Precise calculation of the shortest distance between the posterior pubic symphysis and the sacral promontory.
• Diagonal Conjugate Assessment: Radiographic estimation of the distance from the lower margin of the pubic symphysis to the sacral promontory.
• Fetal Head Engagement Status: Visualization of the relationship between the presenting part of the fetus and the maternal pelvic inlet.
• Pelvic Tilt Abnormalities: Detection of an excessive anterior or posterior pelvic tilt that alters the axis of the birth canal.

Turnaround Time and Report Access at Dr. Essa Lab

At Dr. Essa Lab, we understand that timely diagnostic results are crucial for effective clinical decision-making, especially in obstetric and orthopedic cases. The digital radiography technology utilized at our centers allows for the instantaneous capture and processing of X-ray images. Once the Pelvementry AP Transverse / Lat procedure is completed, the digital images are immediately transferred to our secure Picture Archiving and Communication System (PACS).

A highly qualified consultant radiologist meticulously reviews the images, performs the necessary geometric calculations, and drafts a comprehensive diagnostic report. The finalized report, complete with precise measurements of the pelvic planes, is typically available within 4 to 6 hours of the examination. Patients and their referring physicians can easily access the report and high-resolution digital images through the Dr. Essa Lab online portal or mobile application. Physical copies of the report and X-ray films can also be collected directly from the diagnostic center where the test was performed.

Pelvementry AP Transverse / Lat Findings Overview

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Pelvic Inlet (Transverse)	Diameter > 12.5 cm	Diameter < 11.0 cm (Inlet contraction)
Obstetric Conjugate (AP)	Diameter > 10.5 cm	Diameter < 10.0 cm (Anteroposterior contraction)
Interspinous Diameter (Midplane)	Diameter > 10.0 cm	Diameter < 9.5 cm (Mid-pelvic stenosis)
Subpubic Angle	Wide, obtuse arch (> 85–90 degrees)	Narrow, acute arch (< 80 degrees)
Sacrum and Coccyx	Smooth pelvic curve; mobile coccyx	Flat sacrum; anterior deviation; ankylosed coccyx
Pubic Symphysis	Width < 5 mm (non-pregnant); < 10 mm (pregnant)	Diastasis (widening > 10 mm); misalignment
Sacroiliac Joints	Symmetric, clear joint spaces	Narrowing; subchondral sclerosis; ankylosis
Pelvic Bone Integrity	Intact cortical bone; normal mineralization	Fractures; osteolytic lesions; severe osteopenia

Note: Diagnostic findings should always be interpreted by a qualified healthcare professional together with the patient\’s symptoms, medical history, physical examination, laboratory investigations, previous imaging studies, and other relevant clinical information. Additional investigations or specialist consultation may be recommended depending on the findings.

Why Choose Dr. Essa Lab for Pelvementry AP Transverse / Lat?

• Decades of Diagnostic Excellence: Established in 1987 by Prof. Dr. M. Essa Abdullah, Dr. Essa Lab is a pioneer in quality diagnostics in Pakistan.
• Advanced Digital Radiography: We utilize cutting-edge digital X-ray systems that ensure high-resolution images with minimal radiation exposure.
• Expert Radiologists: Your pelvic measurements are calculated and interpreted by highly experienced consultant radiologists specializing in obstetric and musculoskeletal imaging.
• Extensive Branch Network: With numerous convenient locations across Karachi and other major cities, accessing quality diagnostic services is simple and hassle-free.
• ISO Certified Quality: Dr. Essa Lab maintains strict adherence to international quality control standards, ensuring highly accurate and reliable results.
• Secure Online Reports: Patients can view, download, and share their reports and digital X-ray images instantly through our user-friendly online portal.
• Patient-Centric Care: Our compassionate, professional staff prioritize patient comfort and safety, providing a supportive environment throughout the procedure.
• Affordable Diagnostic Services: We offer premium diagnostic imaging services at competitive rates, making high-quality healthcare accessible to all.