Vol. 5, Issue 1 (2019)

Background: The unique anatomy of the proximal ulna, particularly its dorsal angulation, plays a critical role in maintaining elbow joint stability and function. Accurate understanding of proximal ulna dorsal angulation (PUDA) is essential for fracture fixation, implant design, and reconstructive surgeries. However, limited data are available regarding PUDA measurements in the South Indian population.

Aim: To evaluate the radiographic characteristics of proximal ulna dorsal angulation (PUDA) and tip-to-apex distance in the South Indian adult population and to assess their clinical significance for orthopedic surgical planning.

Materials and Methods: This observational study included 60 bilateral elbow radiographs (32 males, 28 females) obtained from adult patients aged 20-70 years. PUDA and tip-to-apex distances were measured using digital lateral elbow radiographs. Interobserver reliability was assessed. Data were analyzed for side-to-side differences, age-related changes, and gender variations.

Results: PUDA was measurable in 84% of the radiographs. The mean PUDA was 5.7° (right elbow) and 5.5° (left elbow). The tip-to-apex distance was higher in females on the left side compared to males. No significant side-to-side variation in PUDA was noted. Interobserver reliability was excellent for PUDA measurements (ICC = 0.92) and good for tip-to-apex distances (ICC = 0.88).

Conclusion: PUDA exhibits consistent side-to-side symmetry in the South Indian population, with subtle gender differences in tip-to-apex distances. These findings have significant implications for implant design and orthopedic surgical planning, emphasizing the importance of individualized anatomical assessment to improve clinical outcomes.