Opinion by
Judge Barry,James Shrout, the claimant, appeals an order of the Workmens Compensation Appeal Board (Board) which affirmed the decision of the referee denying claimant benefits for the loss of use of his thumb for all practical intents and purposes. Section 306(c) of the Pennsylvania Workmens Compensation Appeal Act, Act of June 2, 1915, P.L. 736, as amended, 77 P.S. §513 (Supp. 1987).
On October 21, 1983, the claimant was injured while working for the Cyclops Corporation when his thumb was caught in a grinding machine. He collected benefits for approximately four months until his retirement, at which time he signed a final receipt. In August of 1984 he filed a petition to set aside the final receipt, alleging that he had lost the use of his thumb for all practical intents and purposes. Both the claimant and the employer presented medical experts. Both experts agreed that the interphalangeal (or distal) joint of the right thumb was permanently bent at thirty degrees and that the claimant could not actively move that joint. Dr. Basil Marryshow, claimants expert, opined that the claimant had lost the use of his right thumb for all intents and purposes. Dr. David Mir, the employers expert, testified that despite the problem, claimant could *315still do a number of tasks, such as use a hammer, dress himself and fasten buttons using the right hand. Dr. Mir testified that he did not believe the claimant had lost the use of his right thumb. At the hearing, the referee observed the claimant pick up a coin and pick up a pen and write his name, both tasks being done with the right hand. The referee denied claimants petition to set aside the final receipt. On appeal, the Board affirmed and this appeal followed.
Our scope of review is limited to determining whether constitutional rights were violated, whether an error of law was committed and whether all necessary factual findings are supported by substantial evidence. Estate of McGovern v. State Employees’ Retirement Board, 512 Pa. 377, 517 A.2d 523 (1986). The claimant contends that the referee and the Board committed an error of law by applying an incorrect legal standard.
Section 306(c) of the Act specifically provides, “The loss of the first phalange of the thumb shall be considered the loss of the thumb. The loss of a substantial part of the first phalange of the thumb shall be considered the loss of one-half of the thumb.” 77 P.S. §513(14) (Supp. 1987). A major point of disagreement existed between the medical experts concerning what constituted the thumb. Dr. Marryshow testified that the thumb had only one joint, the interphalangeal joint. Dr. Mir, on the other hand, testified that the thumb actually begins at the wrist. Both doctors agreed that claimant had no limitations on the range of motion in the joints which connect the thumb to both the palm of the hand and the wrist. Because of this motion in these two joints, the referee accepted Dr. Mirs testimony that the claimant had not lost the use of his thumb for all practical intents and purposes.
We need not be drawn into this controversy between the medical experts, as the Legislature has cho*316sen to define the thumb as the first phalange. 77 P.S. §513(14). We believe this case is controlld by Yaklich v. Union Collieries, 158 Pa. Superior Ct. 55, 43 A.2d 591 (1945). The Court stated:
According to the testimony of Dr. Jamison, the claimant has permanently lost the use of the distal joint or first phalange of his left thumb. Therefore, for all practical intents and purposes, he has lost the first phalange of his thumb to the same effect and extent as if it had been amputated or otherwise physically removed, and consequently, he has suffered the ‘loss’ within the terms of the Act. ...
Id. at 59-60, 43 A.2d at 594.1
In this case, both experts testified that claimant’s distal joint was permanently bent at thirty dégrees and could not be moved actively. The referee neverthless concluded because claimant could use his “thumb” in certain ways that he had not suffered a compensable loss. Because of this error of law, given the Legislature’s pronouncement in Section 306(c), we must reverse the Board’s order. Ney v. Workmen's Compensation Appeal Board, 15 Pa. Commonwealth Ct. 381, 327 A.2d 540 (1974) (claimant may have some use of injured thumb and still have suffered a compensable loss of use of that thumb for specific loss purposes).
Order
Now, February 8, 1988, the order of the Workmen’s Compensation Appeal Board, dated November 21, 1986, at No. A-90651 is reversed.
At the time Yaklich was decided, the Act provided that loss of the first phalange constituted the loss of one-half of the thumb. For our purposes, however, this is of no moment.