Radiographic joint space width in patients with Crowe Type-I dysplastic hips

Area of Science:

• Orthopedic surgery
• Radiology
• Hip biomechanics

Background:

• Preoperative joint space width is crucial for predicting osteotomy outcomes in hip osteoarthritis.
• Developmental dysplasia of the hip (DDH) can lead to secondary osteoarthritis (OA).

Purpose of the Study:

• To determine if joint space width measurements differ between supine and standing radiographic positions in patients with Crowe Type-1 hip OA secondary to DDH.
• To establish optimal radiographic positioning for evaluating joint space width prior to osteotomy.

Main Methods:

• Radiographic joint space width was measured in both supine and standing positions.
• The study included 146 women and 16 men (231 hips) with OA, aged 22-59 years.
• A Level IV diagnostic study evaluating radiographic measurements.

Main Results:

• A statistically significant difference was observed in joint space width between supine (2.35 mm) and standing (2.04 mm) positions.
• In 27% of hips with >1 mm joint space supine, the width decreased by >1 mm when standing.
• Joint space width varied considerably within both positions.

Conclusions:

• Radiographic evaluation of joint space width in patients with hip OA secondary to DDH shows positional differences.
• Standing position radiographs are recommended for accurate preoperative assessment of joint space width before osteotomy.
• Accurate joint space width measurement is vital for successful surgical planning and long-term outcomes in hip OA.