Yes exactly, urethral plate of 12mm or more will give you intraoperative satisfaction and better surgical outcome

Dear Ahmed, Snodgrass,the innovator of TIP technique has mentioned in his illustrated surgical description that " the width and depth" of urethral plate is not a limitation for feasibility of TIP technique,the main limitation arises just from cases with more proximal hypospadiasis. a good reference is : 2 0 0 5  B J U  I nternational | 9 5 , 6 8 3 – 6 9 3  or the link : www.lipteh.com/Study-Notes/Urogenital/Snodgrass%20method.pdf

Some authors consider 8mm as a cut off for TIP, but deepening the midline incision could add benefit for easy suturing as stated by Snodgrass 

If the urethral plate is narrow (less than 12 mm), the incision will only facilitate the tubularization but will not increase the final caliber of the urethra and it will be stenotic. For this reason, more than 20% of patients operated with the TIP technique have obstructed flows.

On the other hand, if the plate is wide, the incision is not necessary, a simple tubularization will be successful.

In conclusion the TIP technique is based on unsound principles and should not be used. 

The importance of uroflow determination after hypospadias repair. A systematic review. Ludwikowski B, González R. Int J Urol. 2011 Nov;18(11):757-61. doi: 10.1111/j.1442-2042.2011.02839.x. Epub 2011 Aug 30.

PMID:21883491

Evaluation of urethral plate is very important for determination of the best technique for repair of hypospadias. the best technique for repair is TIP  which means tubularized incised urethral plate and so all urethral plate could be incised dorsally so narrow urethral plate is not a problem as incision dorsally can increase its width. after tubularization to gain success it is better to cover your repair well which is the corner stone for success. In some cases you can put dorsal preputial skin graft as inlay graft after incising urethral plate which will increase its diameter and i use this technique only in a small number of cases.

as regarding cases with severe chorde and with posterior hypospadias it is better to repair in two stage with distal resection of urethral plate and redistribution of preputial skin ventrally and therich dulpley repair after 3 months 

Take care to use large catheter to avoid urethral stenosis and after repair please change urethral catheter with smaller one to eliminate the possibility of repair under tension 

The incidence of complications increased significantly with UP width

Sure the best results depend upon choosing the candidates for TIP, postoperative dilatation was not routinely used. When it is needed, twice weekly for one month

There different conflicting data about the impact of urethra plate on post hypospadias repair outcomes! I believe that this has resulted from the lack of an objective and consistent method to quantify urethral plate quality which we are currently working on!

The answer is yes... we are preparing a systematic review to answer this question. Will be published soon..

Please read our publication:

Abbas TO, Braga LH, Spinoit AF, Salle JP. Urethral plate quality assessment and its impact on hypospadias repair outcomes: A systematic review and quality assessment. J Pediatr Urol. 2021 Jun;17(3):316-325. doi: 10.1016/j.jpurol.2021.02.017. Epub 2021 Feb 23. PMID: 33846072.