FU: Follow-up; ACDF: Anterior cervical discectomy and fusion; TDR: Total disk replacement; HO: Heterotopic ossifications; ROM: Range of motion; NSAID: Nonsteroidal anti-inflammatory drugs; PE: Polyethylene; ASD: Adjacent segment deterioration.

Fransen P. Long-term Results of Cervical Arthroplasty. J Spinal Surg 2014;1(4):147-150.

The importance of sagittal plane alignment in adults involves both spinal and pelvic parameters. Most papers published in this field have studied white people and, to the best of our knowledge, there are only few studies on Asians and none in south Indian population.

Prospective study of 120 healthy individuals done in Sri Ramachandra Medical college, Chennai, India, from August 2012 to June 2014. The study was conducted in the department of spinal surgery at our center with the approval of the ethical committee. Informed consent was obtained from all volunteers. Inclusion criteria were healthy individuals more than 18 years of age both male and female. Exclusion criteria were those who had any kind of spine or hip surgery, carriers of any type of musculoskeletal syndrome, or had a pelvic limb discrepancy (2 cm). The following items like age, sex and lateral radiographs of the lumbosacral region with the individual standing, so as to obtain the pelvic parameters of PT, SS and PI were collected.

The mean pelvic parameters in our study were pelvic tilt 14.20 ± 7.32, sacral slope 41.20 ± 11.01 and pelvic incidence 58.64 ± 12.59.

The pelvic parameters vary between different ethnicity was evident from our study. However, pelvic parameters of south Indian population have shown some similarity to the Mexican population.

Ganesan GR, Sundarapandian RJ, Kannan KK, Ahmed F, Varthi VP. Does Pelvic Incidence vary between Different Ethnicity? An Indian Perspective. J Spinal Surg 2014;1(4):151-153.

Tripathi SK, Nanda SN, Vatchha S, Kohli A, Pradhan P, Shiraz SM. Biodegradable Implants in Spine. J Spinal Surg 2014;1(4):154-157.

Ali SS, Uttamrao SM, Mangaleswaran B. Spinal Rosai-Dorfman Disease: A Rare Case Report. J Spinal Surg 2014;1(4):158-160.